Re: [meteorite-list] Rocks from Space Picture of the Day - September 9, 2010
Ah, the colors of Fall Anita - Original Message From: Michael Johnson mich...@rocksfromspace.org To: meteorite-list@meteoritecentral.com Sent: Wed, September 8, 2010 10:32:19 PM Subject: [meteorite-list] Rocks from Space Picture of the Day - September 9, 2010 http://www.rocksfromspace.org/September_9_2010.html __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Supernova Shrapnel Found In Meteorite
Media Contact: Steve Koppes +1 773-702-8366 skop...@uchicago.edu Science Contact: Nicolas Dauphas +1 773-702-2930 daup...@uchicago.edu SUPERNOVA SHRAPNEL FOUND IN METEORITE The University of Chicago September 9, 2010 Scientists have identified the microscopic shrapnel of a nearby star that exploded just before or during the birth of the solar system 4.5 billion years ago. Faint traces of the supernova, found in a meteorite, account for the mysterious variations in the chemical fingerprint of chromium found from one planet and meteorite to another. University of Chicago cosmochemist Nicolas Dauphas and eight co-authors report their finding in the Sept. 10, 2010, issue of the Astrophysical Journal. Scientists formerly believed that chromium 54 and other elements and their isotopic variations became evenly spread throughout the cloud of gas and dust that collapsed to form the solar system. It was a very well-mixed soup, said Bradley Meyer, a professor of astronomy and astrophysics at Clemson University who was not a co-author of the study. But it looks like some of the ingredients got in there and didn't get completely homogenized, and that's a pretty interesting result. Scientists have known for four decades that a supernova probably occurred approximately 4.5 billion years ago, possibly triggering the birth of the Sun. Their evidence: traces of aluminum 26 and iron 60, two short-lived isotopes found in meteorites but not on Earth. These isotopes could have come from a Type II supernova, caused by the core-collapse of a massive star. It seems likely that at least one massive star contributed material to the solar system or what was going to become the solar systtem shortly before its birth, Meyer said. Researchers have already extracted many Type II supernova grains from meteorites, but never from a Type Ia supernova. The latter type involves the explosion of a small but extremely dense white-dwarf star in a binary system, one in which two stars orbit each other. It should now be possible to determine which type of supernova contributed the chromium 54 to the Orgueil meteorite. The test will be to measure calcium 48, Dauphas said. You can make it in very large quantities in Type Ia, but it's very difficult to produce in Type II. So if the grains are highly enriched in calcium 48, they no doubt came from a Type Ia supernova. Cosmochemists have sought the carrier of chromium 54 for the last 20 years but only recently have instrumentation advances made it possible to find it. Dauphas's own quest began in 2002, when he began the painstaking meteorite sample-preparation process for the analysis he was finally able to complete only last year. Dauphas and his associates spent three weeks searching for chromium 54-enriched nanoparticles with an ion probe at the California Institute of Technology. Time is very precious on those instruments, and getting three weeks of instrument time is not that easy, he said. The researchers found a hint of an excess of the chromium-54 isotope in their first session, but as luck would have it, they had to search 1,500 microscopic grains of the Orgueil and Murchison meteorites before finding just one with definitely high levels. The grain measured less than 100 nanometers in diameter -- 1,000 times smaller than the diameter of a human hair. This is smaller than all the other kinds of presolar grains that have been documented before, except for nanodiamonds that have been found here at the University of Chicago, Dauphas said. The findings suggest that a supernova sprayed a mass of finely grained particles into the cloud of gas and dust that gave birth to the solar system 4.5 billion years ago. Dynamical processes in the early sol system then sorted these grains by size. These size-sorting processes led the grains to become disproportionally incorporated into the meteorites and planets newly forming around the Sun. It's remarkable that you can look at an isotope like chromium 54 and potentially find out a whole lot about what happened in the very first period of the solar system's formation, Meyer said. # # # Citation: Neutron-rich chromium isotope anomalies in supernova nanoparticles, Sept. 10, 2010, Astrophysical Journal, by Nicolas Dauphas, Laurent Remusat, James Chen, Mathieu Roskosz, Dimitri Papanastassiou, Julien Stodolna, Yunbin Guan, Chi Ma, and John Eiler. Funding: National Aeronautics and Space Administration (NASA) and National Science Foundation (NSF). __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD -Rare specimens from private collection and more...
Hello List I have some new specimens for sale. This time no NWA material but specimens from one of the biggest collections in Poland. So take a look and send me Your offer... . BIALYSTOK [A-EUC] - ultra rare eucrite from Poland! . TATAHOUINE [A-DIO] - big complete specimen . CAMEL DONGA [A-EUC] - big specimen with perfect black crust. . MILLBILLILLIE [A-EUC] - Large oriented specimens AAA+ grade . SIKHOTE-ALIN [IAB] - oriented specimen with CRATER and AAA+ grade . EL HAMMAMI [H5] - 100% fresh fragment with crust . NWA 2932 [MESO] - big mesosiderite endpiece . NWA 6309 [A-EUC] - new small slices www.polandmet.com -[ MARCIN CIMALA ]-[ I.M.C.A.#3667 ]- http://www.Meteoryty.pl marcin(at)meteoryty.pl http://www.PolandMET.com marcin(at)polandmet.com http://www.Gao-Guenie.com GSM: +48 (793) 567667 [ Member of Polish Meteoritical Society ] __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] September Issue of Meteorite-Times Now Up
Thanks Paul and Jim! I think your Meteorite-Times is one of those initiatives here on the List, that is very much appreciated, but doesn't get the explicit appreciation it deserves. Therefore: a big THANK YOU to you and your co-writers! Rob - Original Message - From: Paul Harris p...@meteorite.com To: Meteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 6:38 PM Subject: [meteorite-list] September Issue of Meteorite-Times Now Up Hello Everyone, The September issue of Meteorite-Times is now up. http://www.meteorite-times.com/meteorite_frame.htm Enjoy! Paul and Jim __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Manmade Meteorite, Sputnik IV, Crashed in Wisconsin 48 Years Ago
Dear List, A little known fact about the fate of Sputnik IV: Latest Worldwide Meteor/Meteorite News: Manitowoc, Wisconson: Sputnik IV Crash Site 48 Years Ago 5SEP1962 10SEP2010 www.lunarmeteoritehunters.blogspot.com Best Regards, Dirk Ross...Tokyo __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Phoenix Mars Lander Finds Surprises About Planet's Watery Past
FOR IMMEDIATE RELEASE FROM THE UNIVERSITY OF ARIZONA Sept. 09, 2010 This story and photos are online at: http://uanews.org/node/34019 Contact information follows this story. Phoenix Mars Lander Finds Surprises About Planet's Watery Past An instrument designed and built at the UA measured the isotopic composition of the Mars atmosphere, suggesting liquid water has interacted with the Martian surface throughout the planet's history. Liquid water has interacted with the Martian surface throughout Mars' history, measurements by NASA's Phoenix Mars Lander suggest. The findings, published in the Sept. 10 issue of the journal Science, also suggest that liquid water has primarily existed at temperatures near freezing, implying hydrothermal systems similar to Yellowstone's hot springs on Earth have been rare on Mars throughout its history. These surprising results come from measurements Phoenix made in 2008 of stable isotopes of carbon and oxygen in the carbon dioxide of the Martian atmosphere. Isotopes are variants of the same element with a different number of neutrons, such as carbon-12, with six neutrons, and the rarer carbon-13, with seven. Unprecedented precision in determining the ratios of isotopes in Martian carbon dioxide sheds new light on the history of water and volcanic activity on the surface of Mars. The measurements were performed by the Evolved Gas Analyzer on Phoenix, part of the lander's Thermal and Evolved Gas Analyzer, or TEGA, an instrument designed and built at the University of Arizona. TEGA's mass spectrometer was capable of a more accurate analysis of carbon dioxide than the ones on NASA's Viking landers in the 1970s, the only other such instruments that have returned results on isotopic composition from Mars. We use the TEGA instrument as a crime scene investigator, said William V. Boynton, a professor at the Lunar and Planetary Lab in the UA's department of planetary sciences. Like a chemical fingerprint, isotopes tell us what process is responsible for making the material we are studying. Boynton, who heads the group that built the TEGA instrument, co-authored the Science paper. Carbon dioxide makes up about 95 percent of the Martian atmosphere. NASA's Mars Exploration Program has put a high priority on learning more about the isotope ratios in Martian carbon dioxide to supplement the information from Viking and from analysis of meteorites that have reached Earth from Mars. For the measurement, the TEGA instrument on the lander opened a pin- point-sized hole while a vacuum sucked a puff of Martian atmosphere into its chamber for isotope analysis. The analysis revealed that carbon dioxide on Mars has proportions of carbon and oxygen isotopes similar to carbon dioxide in Earth's atmosphere. This unexpected result reveals that Mars is a much more geologically active planet than previously thought. In fact, the new results suggest that Mars has replenished its atmospheric carbon dioxide relatively recently, and that the carbon dioxide has reacted with liquid water present on the surface. Atmospheric carbon dioxide is like a chemical spy, said Paul Niles, a space scientist at NASA's Johnson Space Center in Houston and lead author of the paper. It infiltrates every part of the surface of Mars and can indicate the presence of water and its history. The low gravity and lack of a magnetic field on Mars mean that as carbon dioxide resides in the atmosphere it will be lost to space, a process that favors loss of the lighter carbon-12 isotope compared to carbon-13. Although an older atmosphere on Mars should contain much more carbon-13, it doesn't. This suggests that the Martian atmosphere has been recently replenished with carbon dioxide emitted from volcanoes, and volcanism has been an active process in Mars' geologically recent past. Another clue comes from the second element that makes up carbon dioxide: oxygen. Oxygen, like carbon, comes in different isotopes: oxygen-16 and the heavier oxygen-18. The team compared the results from Phoenix to measurements obtained from Martian meteorites that were hurled into space from the Red Planet's surface during impact events and eventually fell onto Earth where they were later collected. The meteorites contain carbonate minerals that form only in the presence of liquid water and carbon dioxide. Carbon dioxide spewed into the atmosphere by volcanoes is very similar in its oxygen isotope ratio to that found in rocks, said Boynton. But we see a big difference between the oxygen ratios of the volcanic rocks and the atmosphere. This suggests that the carbon dioxide in the volcanic rock of Martian meteorites has reacted with liquid water, enriching the oxygen in carbon dioxide with heavier oxygen-18. The comparisons of isotopes in Mars' atmosphere with those in the meteorites provide confirmation of key findings. For example, one meteorite that crystallized during recent
[meteorite-list] AD: Heads Up! Auctions End In A Few Hours. Honestly this is going to be one of THE LAST Auction Runs...
Hello, Well it looks like the days of my 0.99 cent auctions are coming to an end. Why bother anymore. My ebay store has very steady sales and people are willing to pay more in my store than they are during the auction runs. I know the economy is slow, but my store sales do not indicate that. However, the auctions show that we are in a depression! I will think about doing it one more time, but honestly I believe 0.99 cent auctions are a thing of the pasttoo bad because they were fun. Many of my meteorite friends have already stopped doing them. When is the last time you saw Mike Farmer do a 0.99 cent auction? Greg Hupe? Others are stopping the 0.99 cent auctions all together. I just wanted to give everyone a heads up on my 0.99 cent auctions...one more time. http://stores.ebay.com/voyage-botanica-natural-history ALL AUCTIONS HERE: http://shop.ebay.com:80/merchant/meteorite-collector_W0QQLHQ5fAuctionZ1QQ ThanksMichael Cottingham __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Meteor Crater Impactor?
Hi List, Can someone tell me the proposed/accepted angle of descent of the asteroid which formed Meteor Crater in AZ? Wikipedia has the impactor at 50 meters across, and velocity at 12.8 km/s. Is this accurate? Eric __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] September Issue of Meteorite Times Now Up
Rob L. kindly wrote: Thanks Paul and Jim! I think your Meteorite-Times is one of those initiatives here on the List, that is very much appreciated, but doesn't get the explicit appreciation it deserves. Hello Rob and List, I couldn't agree more! Special thanks also to Chuck whose September contribution about NWA 2377 (L3.7) prompted me to once again put my 5.1-gram slice under the microscope and enjoy visually walking over it! Here is my description of this little partslice: Partslice purchased from the Hupés that displays well-defined chondrules large and small. The smaller chondrules are closely packed and there is abundant troilite. One chondrule found with thin troilite channels traversing it. NWA 2377 is rich in porphy- ritic chondrules that contain abundant, translucent light-green hypersthene crystals. Cheers, Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Amateur Astronomers Are First To Detect Objects Impacting Jupiter
Sep. 9, 2010 Dwayne Brown Headquarters, Washington 202-358-1726 dwayne.c.br...@nasa.gov Jia-Rui Cook Jet Propulsion Laboratory, Pasadena, Calif. 818-354-0850 jia-rui.c.c...@jpl.nasa.gov RELEASE: 10-217 AMATEUR ASTRONOMERS ARE FIRST TO DETECT OBJECTS IMPACTING JUPITER WASHINGTON -- Amateur astronomers using backyard telescopes were the first to detect two small objects that burned up in Jupiter's atmosphere on June 3 and Aug. 20. Professional astronomers at NASA and other institutions followed up on the discovery and gathered detailed information on the objects, which produced bright spots on Jupiter. The object that caused the June 3 fireball was estimated to be 30 to 40 feet in diameter - comparable in size to asteroid 2010 RF12 that flew by Earth on Sept. 8. The June 3 fireball released five to 10 times less energy than the 1908 Tunguska meteoroid, which exploded 4-6 miles above Earth's surface with a powerful burst that knocked down millions of trees in a remote part of Russia. Scientists continue to analyze the Aug. 20 fireball, but think it was comparable to the June 3 object. Jupiter is a big gravitational vacuum cleaner, said Glenn Orton, an astronomer at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Calif., and co-author of a paper that will appear online Thursday in Astrophysical Journal Letters. It is clear now that relatively small objects that are remnants from the formation of the solar system 4.5 billion years ago still hit Jupiter frequently. Scientists are trying to figure out just how frequently. The lead author of the paper in Astrophysical Journal Letters is Ricardo Hueso of the Universidad del Pais Vasco in Bilbao, Spain. Before amateurs spotted the June 3 impact, scientists were unaware collisions that small could be observed. Anthony Wesley, an amateur astronomer from Australia who discovered a dark spot on Jupiter in July 2009, was the first to see the tiny flash on June 3. Amateur astronomers had trained their backyard telescopes on Jupiter that day because the planet was in a particularly good position for viewing. Wesley was watching real-time video from his telescope when he saw a 2.5-second-long flash of light near the edge of the planet. It was clear to me straight away it had to be an event on Jupiter, Wesley said. Another amateur astronomer, Christopher Go, of Cebu, Philippines, confirmed the flash also appeared in his recordings. Professional astronomers, alerted by email, looked for signs of the impact in images from larger telescopes, including NASA's Hubble Space Telescope, the European Southern Observatory's Very Large Telescope in Chile, and Gemini Observatory telescopes in Hawaii and Chile. Scientists saw no thermal disruptions or typical chemical signatures of debris, which allowed them to put a limit on the size of the object. Based on the data, the astronomers deduced the flash came from an object - probably a small comet or asteroid - burning up in Jupiter's atmosphere. The object likely had a mass of about 1-4 million pounds, about 100,000 times lighter than another object that hit Jupiter in July 2009. The second fireball on Aug. 20 was first detected by Japanese amateur astronomer Masayuki Tachikawa. It flashed for about 1.5 seconds and left no debris observable by a large telescope. It is interesting to note that while Earth gets smacked by a 10-meter-sized object about every 10 years on average, it looks as though Jupiter gets hit with the same-sized object a few times each month, said Don Yeomans, manager of the Near-Earth Object Program Office at JPL. The Jupiter impact rate is still being refined and studies like this one help to do just that. Previous models of collisions this size on Jupiter had predicted as few as one and as many as 100 such collisions a year. Scientists now believe the frequency must be closer to the high end of the scale. To see images and videos of the two impacts, visit: http://www.nasa.gov/topics/solarsystem/features/jupiter20100909.html -end- __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD: Heads Up! Auctions End In A Few Hours. Honestly this is going to be one of THE LAST Auction Runs...
Hello, Well it looks like the days of my 0.99 cent auctions are coming to an end. Why bother anymore. My ebay store has very steady sales and people are willing to pay more in my store than they are during the auction runs. I know the economy is slow, but my store sales do not indicate that. However, the auctions show that we are in a depression! I will think about doing it one more time, but honestly I believe 0.99 cent auctions are a thing of the pasttoo bad because they were fun. Many of my meteorite friends have already stopped doing them. When is the last time you saw Mike Farmer do a 0.99 cent auction? Greg Hupe? Others are stopping the 0.99 cent auctions all together. I just wanted to give everyone a heads up on my 0.99 cent auctions...one more time. http://stores.ebay.com/voyage-botanica-natural-history ALL AUCTIONS HERE: http://shop.ebay.com:80/merchant/meteorite-collector_W0QQLHQ5fAuctionZ1QQ ThanksMichael Cottingham __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] test
test __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] RFSPOD September 09, 2010 - (slightly off-topic)
Anita wrote: Ah, the colors of Fall... Emily Dickinson (1830-86) the daughter of Edward Dickinson, a prominent lawyer of Amherst, Massachusetts. Here is one of her many short poems: Autumn The morns are meeker than they were, The nuts are getting brown, The berry's cheek is plumper, The rose is out of town. The maple wears a gayer scarf, The field a scarlet gown. Lest I should be old-fashioned I'll put a trinket on. --- Cheers, Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Mooresfort Meteorite
With the reports of a possible fall of a meteorite in Co. Tipperary, Ireland, it's interesting to note that the Mooresfort meteorite fell in Co. Tipperary in August 1810, slightly over 200 years ago. A paper of mine involving the history of the Mooresfort meteorite and how it led to one of the greatest battles in the history of chemistry - the battle over who developed the atomic theory - John Dalton or William Higgins - is scheduled for publication in Notes Records of the Royal Society in December 2010. You can view the abstract of the article, which is entitled William Higgins at the Dublin Society, 1810-1820: the loss of a professorship and a claim to the atomic theory at the FirstCite section of the journal: http://rsnr.royalsocietypublishing.org/content/firstcite The article is listed in the middle of the page under the date July 28. Just click on the abstract link. Notes Records of the Royal Society should be available at most college and museum libraries. The article will be freely available at the Notes Records website one year after publication. It's a very interesting story about the Mooresfort meteorite which I think many of the list subscribers might enjoy. Mark Grossman Author of Smithson Tennant: meteorites and the final trip to France, Notes Records of the Royal Society 2007 61, 265-283. http://rsnr.royalsocietypublishing.org/content/61/3.toc Mark Grossman 28 Cypress Lane Briarcliff Manor, NY 10510 USA __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Manmade Meteor/Meteorite, Sputnik IV, Crashed 5SEP1962 48 Years Ago
Dear List, A little-known fact about the fate of Sputnik IV in Wisconsin: http://lunarmeteoritehunters.blogspot.com/2010/09/manitowoc-wisconson-sputnik-iv-crash.html Best Regards, Dirk Ross...Tokyo Sorry if this posts twice; first time failed to post. __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] sorry for the extra posts
My emails are not coming through on my computer, but I see that I have 3 posts in the archieves ...my apologies for the extras Best Wishes Michael Cottingham __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] RFSPOD---nwa2737
I think it's because there's a longer than normal delay in posting to the list. Hence the double postings. Art sent out an email a couple days ago mentioning this. Eric On 9/9/2010 12:37 PM, jim_brady...@o2.co.uk wrote: metal nano particle formation in the olivine? Would love to see that at greater magnification A pallasite within a chassignite? on a separate note,I would have thought all listees were aware that there is a time delay between posting a message to the list and it showing up.Seems to be an awful lot of duplicates recently Sláinte __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Ad Whetstone Mountains
Dear list members, For all those interested and especially those who have inquired about this Whetstone Mountains specimen, I have listed the 77.3 gram portion of the main mass on eBay with a Buy it Now price. The auction will remain active for ten days and can be seen here: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=160479111730 Best wishes, Jack __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD - Rare specimens from private collection and more...
Hello List I have some new specimens for sale. This time no NWA material but specimens from one of the biggest collections in Poland. So take a look and send me Your offer... . BIALYSTOK [A-EUC] - ultra rare eucrite from Poland! . TATAHOUINE [A-DIO] - big complete specimen . CAMEL DONGA [A-EUC] - big specimen with perfect black crust. . MILLBILLILLIE [A-EUC] - Large oriented specimens AAA+ grade . SIKHOTE-ALIN [IAB] - oriented specimen with CRATER and AAA+ grade . EL HAMMAMI [H5] - 100% fresh fragment with crust . NWA 2932 [MESO] - big mesosiderite endpiece . NWA 6309 [A-EUC] - new small slices http://www.polandmet.com -[ MARCIN CIMALA ]-[ I.M.C.A.#3667 ]- http://www.Meteoryty.pl marcin(at)meteoryty.pl http://www.PolandMET.com marcin(at)polandmet.com http://www.Gao-Guenie.com GSM: +48 (793) 567667 [ Member of Polish Meteoritical Society ] __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Meteorite Hunting Magazine Help with affiliate link
Hi List. I can't seem to get a good answer to this question off list so I will go this route. Anyways, does anyone have their site linked as an affiliate to the new Meteorite Hunting magazine. I have gone through the directions to do this but now when I click the Hop link I was given to use on my site... it does show the graphic of the Meteorite Hunting Magazine but then most of the page after is about joining as an affiliate for the magazine. I know I can use several of the affiliate links offered such as the HOP or Direct sale button, or the link code that takes you to Bits of Earth LLC which does show the graphic and info only of the Magazine (with no affiliate joining page underneath like the Hop link. If someone has theirs set up correctly on there site can I look at your site and click this affiliate link to this magazine so I can see what should come up so I can and compare to what I see so as if to know I have followed the right directions Thank you. Sincerely Don Merchant IMCA #0960 __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] test
test __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] NASA Data Shed New Light About Water and Volcanoes on Mars (Phoenix)
Sep. 9, 2010 Dwayne Brown Headquarters, Washington 202-358-1726 dwayne.c.br...@nasa.gov William Jeffs Johnson Space Center, Houston 281-483-5111 william.p.je...@nasa.gov RELEASE: 10-216 NASA DATA SHED NEW LIGHT ABOUT WATER AND VOLCANOES ON MARS HOUSTON -- Data from NASA's Phoenix Mars Lander suggest liquid water has interacted with the Martian surface throughout the planet's history and into modern times. The research also provides new evidence that volcanic activity has persisted on the Red Planet into geologically recent times, several million years ago. Although the lander, which arrived on Mars on May 25, 2008, is no longer operating, NASA scientists continue to analyze data gathered from that mission. These recent findings are based on data about the planet's carbon dioxide, which makes up about 95 percent of the Martian atmosphere. Atmospheric carbon dioxide is like a chemical spy, said Paul Niles, a space scientist at NASA's Johnson Space Center in Houston. It infiltrates every part of the surface of Mars and can indicate the presence of water and its history. Phoenix precisely measured isotopes of carbon and oxygen in the carbon dioxide of the Martian atmosphere. Isotopes are variants of the same element with different atomic weights. Niles is lead author of a paper about the findings published in Thursday's online edition of the journal Science. The paper explains the ratios of stable isotopes and their implications for the history of Martian water and volcanoes. Isotopes can be used as a chemical signature that can tell us where something came from, and what kinds of events it has experienced, Niles said. This chemical signature suggests that liquid water primarily existed at temperatures near freezing and that hydrothermal systems similar to Yellowstone's hot springs have been rare throughout the planet's past. Measurements concerning carbon dioxide showed Mars is a much more active planet than previously thought. The results imply Mars has replenished its atmospheric carbon dioxide relatively recently, and the carbon dioxide has reacted with liquid water present on the surface. Measurements were performed by an instrument on Phoenix called the Evolved Gas Analyzer. The instrument was capable of doing more accurate analysis of carbon dioxide than similar instruments on NASA's Viking landers in the 1970s. The Viking Program provided the only previous Mars isotope data sent back to Earth. The low gravity and lack of a magnetic field on Mars mean that as carbon dioxide accumulates in the atmosphere, it will be lost to space. This process favors loss of a lighter isotope named carbon-12 compared to carbon-13. If Martian carbon dioxide had experienced only this process of atmospheric loss without some additional process replenishing carbon-12, the ratio of carbon-13 to carbon-12 would be much higher than what Phoenix measured. This suggests the Martian atmosphere recently has been replenished with carbon dioxide emitted from volcanoes, and volcanism has been an active process in Mars' recent past. However, a volcanic signature is not present in the proportions of two other isotopes, oxygen-18 and oxygen-16, found in Martian carbon dioxide. The finding suggests the carbon dioxide has reacted with liquid water, which enriched the oxygen in carbon dioxide with the heavier oxygen-18. Niles and his team theorize this oxygen isotopic signature indicates liquid water has been present on the Martian surface recently enough and abundantly enough to affect the composition of the current atmosphere. The findings do not reveal specific locations or dates of liquid water and volcanic vents, but recent occurrences of those conditions provide the best explanations for the isotope proportions. The Phoenix mission was led by principal investigator Peter H. Smith of the University of Arizona in Tucson, with project management at NASA's Jet Propulsion Laboratory in Pasadena, Calif. The University of Arizona provided the lander's Thermal and Evolved Gas Analyzer. For more information about the Phoenix mission, visit: http://www.nasa.gov/phoenix -end- __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Tunguska Tektite?
Has anyone heard of the claims related to tektites Associated with the the Tunguska event? See these offerings on eBay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=180558454201ssPageName=A DME:B:SS:US:1123 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=180558453506ssPageName=A DME:B:SS:US:1123 Anyone know who lives in Clearwater, FLA? Michael __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD: Heads Up! Auctions End In A Few Hours. Honestly this is going to be one of THE LAST Auction Runs...
Hello, Well it looks like the days of my 0.99 cent auctions are coming to an end. Why bother anymore. My ebay store has very steady sales and people are willing to pay more in my store than they are during the auction runs. I know the economy is slow, but my store sales do not indicate that. However, the auctions show that we are in a depression! I will think about doing it one more time, but honestly I believe 0.99 cent auctions are a thing of the pasttoo bad because they were fun. Many of my meteorite friends have already stopped doing them. When is the last time you saw Mike Farmer do a 0.99 cent auction? Greg Hupe? Others are stopping the 0.99 cent auctions all together. I just wanted to give everyone a heads up on my 0.99 cent auctions...one more time. http://stores.ebay.com/voyage-botanica-natural-history ALL AUCTIONS HERE: http://shop.ebay.com:80/merchant/meteorite-collector_W0QQLHQ5fAuctionZ1QQ ThanksMichael Cottingham __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Rocks from Space Picture of the Day - September 10, 2010
http://www.rocksfromspace.org/September_10_2010.html __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] September Issue of Meteorite-Times Now Up
Dear Rob, Thank you very much for your THANK YOU! We VERY much appreciate you adding your THANK YOU to all the writers. Martin Horejsi, Michael Blood, Bob Verish, Norbert Classen and the IMCA Team, John Kashuba, Anne Black keeper of the Meteorite Fall Calendar, and Michael Johnson's Meteorite of the Month. They all have very busy lives and still allow us to bug them each month for their much appreciated contribution to Meteorite-Times. There would be no Meteorite-Times without them. Thank you to everyone who enjoys Meteorite-Times! The Meteorite-Times Team On 9/9/2010 12:18 PM, Rob Lenssen wrote: Thanks Paul and Jim! I think your Meteorite-Times is one of those initiatives here on the List, that is very much appreciated, but doesn't get the explicit appreciation it deserves. Therefore: a big THANK YOU to you and your co-writers! Rob - Original Message - From: Paul Harris p...@meteorite.com To: Meteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 6:38 PM Subject: [meteorite-list] September Issue of Meteorite-Times Now Up Hello Everyone, The September issue of Meteorite-Times is now up. http://www.meteorite-times.com/meteorite_frame.htm Enjoy! Paul and Jim __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Origin of Tektites
Are there any tektite experts on this list? The formation of tektites has been a mystery to science. Volcanic origin, Lunar ejecta, meteorite impact origin, explosive electrical discharge, etc. The latter proposed by NASA experiments at an arc-jet facility. What are the current theories on the formation of tektites. Are there any papers on this that I could get my hands on? Thanks: Ed Majden Courtenay, B.C. Canada __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD: Lots of ebay auctions ending now
Over the next couple hours I have a couple dozen ebay auctions ending including a few over a kilo. Nothing spectacular but most well under ten cents a gram. I took advantage of ebays free listing day last week to list some bigger ones in auction cheap which I dont normally do. I have been slowly listing lots of minerals other than meteorites to so see all my other auctions for more great stuff See my ebay user id AMUNRE Or click here: http://stores.ebay.com/DEANS-COLLECTIBLES-AND-GEMSTONES?_rdc=1 Sincerely DEAN http://stores.ebay.com/DEANS-COLLECTIBLES-AND-GEMSTONES?_rdc=1 __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Planetary Body Odors
Very cool article Bob! Eric On 9/9/2010 10:49 PM, Robert Verish wrote: Hello List, Would like to hear from any of you that have a fragmental impact breccia in your collection, and think that it is giving-off an odor. ( Here is a list of some Impact Melt Breccia (IMB): http://www.mars.li/impact%20melt%20meteorites.htm ) Also, would the first person that finds a fresh Lunar fall, please check to see if it has an odor like burnt gunpowder? If you read my latest Meteorite-Times article you would understand why I am making these strange requests. My article (with more information) is here: http://meteorite-recovery.tripod.com/2010/sep10.htm even your closest satellites won’t tell you.” :+( Bob V. __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] test
list down ? __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Australian Rock Show Announcement
Not sure how many list members live in Eastern Australia but if you do you might want to come up to Bribie Island just north of Brisbane for the Bribie Island Gem and Fossiking clubs annual rock and gem show. They have a big show and a lot of dealers and its one of the major rock shows in the australian rock show circuit. For those not familiar with bribie Island it is a large island about an hours drive north of Brisbane which has become a major retirement and lifestyle area with a endless array of artificial waterways where a few thousand half million dollar houses have a private pier where you can park your yacht in your back yard and where there is an awesome of road 4WD track. Its a really nice place. I will probably be the only person with meteorites but there will be lots of rocks and crystals. Mostly I will be selling loose gemstones. I will be outside with the tailgaters as I need more space than inside and we will be camping onsite. My kiddies are already excited about roasting marshmellows which we do every time we go camping. If coming bringing beer would be appropriate. Cheers DEAN See website here for more details or email me off list. http://www.bribieisland.lapidaryclub.com.au/NewsInfo/tabid/60/articleType/ArticleView/articleId/4/2010-Annual-Gem-Show-11th-and-12th-September.aspx __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Venusian meteorites
Hi Chris and List, I am going to take a wild layman stab at this one and then Sterling Webb can come in and clean up my mess. ;) LOL All of the confirmed planetary meteorites we have seen (barring the disputed Angrite-Mercury connection) come from planets further out from the sun than Earth. So I am guessing that maybe the Sun's gravitational influence would have more effect on a Venusian rock that manages to escape that acidic and hellish world. Perhaps the gravitational perturbations introduced by Venus' proximity to Sol make it less likely that a Venusian fragment would cross paths with Earth? And perhaps the very nature of Venus' atmosphere make it less likely for such rocks to achieve escape velocity and survive the trip out of the acid bath. Best regards, MikeG On 9/9/10, Chris Spratt cspr...@islandnet.com wrote: Where the Venusian meteorites? Chris Spratt Victoria, BC (Via my iPhone) __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list -- -- Mike Gilmer - Galactic Stone Ironworks Meteorites Website - http://www.galactic-stone.com Facebook - http://www.facebook.com/galacticstone News Feed - http://www.galactic-stone.com/rss/126516 Twitter - http://twitter.com/galacticstone EOM - http://www.encyclopedia-of-meteorites.com/collection.aspx?id=1564 --- __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteorite Hunting Magazine Help with affiliate link
Hi Don, See my reply to you offlist. Thanks. Regards, Eric (By the way, I answered your email earlier. You actually have to have a website to post the HTML on.) On 9/9/2010 4:15 PM, Don Merchant wrote: Hi List. I can't seem to get a good answer to this question off list so I will go this route. Anyways, does anyone have their site linked as an affiliate to the new Meteorite Hunting magazine. Sincerely Don Merchant IMCA #0960 __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Impactor?
Eric, List, That is the conclusion of the 2005 paper in Nature by Melosh and Collins. Their computer models suggest it fragmented and came in as a swarm of pieces, much slowed by the atmosphere. Here's two popular articles: http://news.nationalgeographic.com/news/2005/03/0310_050310_meteorcrater.html and http://www.astronomy.com/asy/default.aspx?c=aid=2965 Here's original paper: http://amcg.ese.ic.ac.uk/~gsc/publications/articles/download/article7.pdf Well, one page from Nature, Vol. 434, 10 March, 2005. Sterling K. Webb - - Original Message - From: Meteorites USA e...@meteoritesusa.com To: Meteorite-list meteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 10:44 AM Subject: [meteorite-list] Meteor Crater Impactor? Hi List, Can someone tell me the proposed/accepted angle of descent of the asteroid which formed Meteor Crater in AZ? Wikipedia has the impactor at 50 meters across, and velocity at 12.8 km/s. Is this accurate? Eric __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Origin of Tektites
Hi Ed. At the risk of starting up the 'great Tektite wars' again, (second only to the God Thread) I think it's now been very well established that they are of Earth impact origin (i.e terrestrial). The lunar origin, is still propagated by a small minority of people. The evidence for a lunar origin just doesn't entirely stack up. Granted there are things we still don't understand, but plenty of elemental studies have indicated they have trace chemical signatures which match known Earth bedrock formations. (hey, I've even seen a partially melted tektite with melted sedimentary rock poking out of it?!) I recommend Aubrey's excellent site for a start http://www.tektites.co.uk There is a good set of references to papers etc at http://www.tektites.co.uk/bibliography.html Mark -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Ed Majden Sent: 10 September 2010 06:06 To: meteorite-list@meteoritecentral.com Cc: RASCals Discussion List; MIAC List Subject: [meteorite-list] Origin of Tektites Are there any tektite experts on this list? The formation of tektites has been a mystery to science. Volcanic origin, Lunar ejecta, meteorite impact origin, explosive electrical discharge, etc. The latter proposed by NASA experiments at an arc-jet facility. What are the current theories on the formation of tektites. Are there any papers on this that I could get my hands on? Thanks: Ed Majden Courtenay, B.C. Canada __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list CONFIDENTIALITY NOTICE: This email and any files transmitted with it are confidential. If you are not the intended recipient, please notify us. Email i...@ssl.gb.com. You should not copy or use this email or attachment(s) for any purpose nor disclose their contents to any other person. GENERAL STATEMENT: Southern Scientific Ltd's computer systems may be monitored and communications carried on them recorded, to secure the effective operation of the system and for other lawful purposes. Registered address Rectory Farm Rd, Sompting, Lancing, W Sussex BN15 0DP. Company No 1800317 __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Origin of Tektites
Hi Ed, Not an expert by any means on tektites but the subject has been discussed here quite a bit in the past. You can go to the meteorite central site and conduct a search on what has been said or google a search on tektites. We do have very knowledgeable people on here that can offer information. With that said, volcanic origin (on Earth) can be ruled out because tektites are way too dry to be a by product of terrestrial volcanos. Lunar ejecta is unlikely due to the isolated spots tektites are found. Lunar origin is an old theory that has (for the most part) gone by the way side. Meteorite impacts are the most widely accepted theory of formation but not without its problems. Tektites are glassy specimens that were highly heated and so their pasts have been altered. This makes trying to find their parent source very difficult. Their have been air bubbles that have been studied in them that gives indication of Earth origin due to the gases trapped inside them. Beyond that you will have to do research to find a more detailed explanation as to their compositions and origins. Best! --AL Mitterling Mitterling Meteorites www.mitterling.com Quoting Ed Majden epmaj...@shaw.ca: Are there any tektite experts on this list? The formation of tektites has been a mystery to science. Volcanic origin, Lunar ejecta, meteorite impact origin, explosive electrical discharge, etc. The latter proposed by NASA experiments at an arc-jet facility. What are the current theories on the formation of tektites. Are there any papers on this that I could get my hands on? Thanks: Ed Majden Courtenay, B.C. Canada __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Impactor?
Hi Sterling, Thanks for the answer, and links. Still have a question though. I'm more curious about the angle of descent. The paper mentions an angle of 45 degrees. This seems like a very safe guess. Are there any data, or information on the angle of descent other than in the paper you provided a link to. See this crater photo from Google Earth: http://www.mhcmagazine.com/images/crater.jpg The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle.In fact the crater is more elliptical in shape. It appears as if the impactor hit at an angle quite a bit shallower than 45 degrees. Is it possible the impactor came in at a shallower angle? Regards, Eric On 9/10/2010 1:34 AM, Sterling K. Webb wrote: Eric, List, That is the conclusion of the 2005 paper in Nature by Melosh and Collins. Their computer models suggest it fragmented and came in as a swarm of pieces, much slowed by the atmosphere. Here's two popular articles: http://news.nationalgeographic.com/news/2005/03/0310_050310_meteorcrater.html and http://www.astronomy.com/asy/default.aspx?c=aid=2965 Here's original paper: http://amcg.ese.ic.ac.uk/~gsc/publications/articles/download/article7.pdf Well, one page from Nature, Vol. 434, 10 March, 2005. Sterling K. Webb - - Original Message - From: Meteorites USA e...@meteoritesusa.com To: Meteorite-list meteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 10:44 AM Subject: [meteorite-list] Meteor Crater Impactor? Hi List, Can someone tell me the proposed/accepted angle of descent of the asteroid which formed Meteor Crater in AZ? Wikipedia has the impactor at 50 meters across, and velocity at 12.8 km/s. Is this accurate? Eric __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Meteor Crater Impactor?
Eric wondered: Can someone tell me the proposed/accepted angle of descent of the asteroid which formed Meteor Crater in AZ? The trajectory of the impacting body was interpreted by Shoemaker as traveling north-northwest at a relatively low impact angle. and furthermore: Wikipedia has the impactor at 50 meters across, and velocity at 12.8 km/s. Is this accurate? The authors write themeteorite had a velocity in the range of about 13 to 20 km/s, probably in the lower part of this range and estimated the coherent meteorite diameter to have been 45-50 m with a mass of 300,000 - 400,000 tons! Reference: D.J. Roddy, E.M. Shoemaker (1995) Meteor Crater: Summary of impact conditions (Meteoritics 30-5, 1995, p. 567). - Best wishes, Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Impactor?
Hi Bernd, Thanks! What would a relatively low impact angle be? 10 degrees, 20 degrees? See my post just before this one. Eric On 9/10/2010 2:51 AM, bernd.pa...@paulinet.de wrote: Eric wondered: Can someone tell me the proposed/accepted angle of descent of the asteroid which formed Meteor Crater in AZ? The trajectory of the impacting body was interpreted by Shoemaker as traveling north-northwest at a relatively low impact angle. and furthermore: Wikipedia has the impactor at 50 meters across, and velocity at 12.8 km/s. Is this accurate? The authors write themeteorite had a velocity in the range of about 13 to 20 km/s, probably in the lower part of this range and estimated the coherent meteorite diameter to have been 45-50 m with a mass of 300,000 - 400,000 tons! Reference: D.J. Roddy, E.M. Shoemaker (1995) Meteor Crater: Summary of impact conditions (Meteoritics 30-5, 1995, p. 567). - Best wishes, Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Meteor Crater Shape and Entry Angle
Eric wrote: The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle. In fact the crater is more elliptical in shape. SHOEMAKER E.M. and KIEFFER S.W. (1974, 1979) Guidebook to the Geology of Meteor Crater, Arizona (Publ. No. 17, Center for Meteorite Studies, Arizona State University, Tempe, Arizona): Regional jointing has controlled the shape of the crater, which is somewhat squarish in outline; the diagonals of the square coincide with the trend of the two main sets of joints. The largest tears occur in the corners of the crater. Eric also inquired: What would a relatively low impact angle be? 10 degrees, 20 degrees? I tried to find more precise information on that but was unable to find something that might be of help here. Maybe someone else can shed more light on this! Regards, Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Impactor?
I think it looks elliptical in that Google picture because of the perspective of the image. To my eye when viewed from directly above it is more like a square with rounded corners. By the way does anyone know what that 100m diameter circular structure is, located at 0.85 km to the SSW of the southern crater rim? Looks manmade but what is it? John On 10/09/2010 12:59, Meteorites USA e...@meteoritesusa.com wrote: Hi Sterling, Thanks for the answer, and links. Still have a question though. I'm more curious about the angle of descent. The paper mentions an angle of 45 degrees. This seems like a very safe guess. Are there any data, or information on the angle of descent other than in the paper you provided a link to. See this crater photo from Google Earth: http://www.mhcmagazine.com/images/crater.jpg The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle.In fact the crater is more elliptical in shape. It appears as if the impactor hit at an angle quite a bit shallower than 45 degrees. Is it possible the impactor came in at a shallower angle? Regards, Eric On 9/10/2010 1:34 AM, Sterling K. Webb wrote: Eric, List, That is the conclusion of the 2005 paper in Nature by Melosh and Collins. Their computer models suggest it fragmented and came in as a swarm of pieces, much slowed by the atmosphere. Here's two popular articles: http://news.nationalgeographic.com/news/2005/03/0310_050310_meteorcrater. html and http://www.astronomy.com/asy/default.aspx?c=aid=2965 Here's original paper: http://amcg.ese.ic.ac.uk/~gsc/publications/articles/download/article7.pdf Well, one page from Nature, Vol. 434, 10 March, 2005. Sterling K. Webb - - Original Message - From: Meteorites USA e...@meteoritesusa.com To: Meteorite-list meteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 10:44 AM Subject: [meteorite-list] Meteor Crater Impactor? Hi List, Can someone tell me the proposed/accepted angle of descent of the asteroid which formed Meteor Crater in AZ? Wikipedia has the impactor at 50 meters across, and velocity at 12.8 km/s. Is this accurate? Eric __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] AD: Heads Up! Auctions End In A Few Hours. Honestly this is going to be one of THE LAST Auction Runs...
In spite of all your posts I can find no auctions when I click on your link. Dan - Original Message - From: michael cottingham voyagebotan...@hotmail.com To: meteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 2:09 PM Subject: [meteorite-list] AD: Heads Up! Auctions End In A Few Hours. Honestly this is going to be one of THE LAST Auction Runs... Hello, Well it looks like the days of my 0.99 cent auctions are coming to an end. Why bother anymore. My ebay store has very steady sales and people are willing to pay more in my store than they are during the auction runs. I know the economy is slow, but my store sales do not indicate that. However, the auctions show that we are in a depression! I will think about doing it one more time, but honestly I believe 0.99 cent auctions are a thing of the pasttoo bad because they were fun. Many of my meteorite friends have already stopped doing them. When is the last time you saw Mike Farmer do a 0.99 cent auction? Greg Hupe? Others are stopping the 0.99 cent auctions all together. I just wanted to give everyone a heads up on my 0.99 cent auctions...one more time. http://stores.ebay.com/voyage-botanica-natural-history ALL AUCTIONS HERE: http://shop.ebay.com:80/merchant/meteorite-collector_W0QQLHQ5fAuctionZ1QQ ThanksMichael Cottingham __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Tunguska Tektite?
No crater! No tektites! Dan - Original Message - From: Michael Blood mlbl...@cox.net To: Meteorite List meteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 1:52 PM Subject: Re: [meteorite-list] Tunguska Tektite? Has anyone heard of the claims related to tektites Associated with the the Tunguska event? See these offerings on eBay: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=180558454201ssPageName=A DME:B:SS:US:1123 http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=180558453506ssPageName=A DME:B:SS:US:1123 Anyone know who lives in Clearwater, FLA? Michael __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Shape and Entry Angle
Eric, Bernd, Sterling, List, David Kring of LPL put together a great guidebook for the 2007 MetSoc tour of the crater (150 pages). He is Gene Shoemakers successor as advisor to the Barringer family. He and family members lead the tour. Carolyn Shoemaker was there too. Chapter 9. Trajectory begins and ends thusly: The trajectory of the impacting asteroid is another issue of considerable debate and still unresolved. Historically, circular plan views of impact craters confounded many investigators who assumed a circular crater requires a vertical impact. They wondered why more craters are not elliptical. Gilbert and Barringer both realized that 45 degree impacts are the most probable trajectories for meteoritic material. Yet Gilbert, like many of his contemporaries, mistakenly thought a 45 degree impact produces an oval crater (Hoyt, 1987). Barringer, on the other hand, realized that a 45 degree impact will produce a round crater (Hoyt, 1987). Despite this insight, Barringer, like Gilbert, initially assumed that the northern Arizona impact had been vertical or nearly vertical and that the asteroid was buried beneath the center of the crater floor. When extensive drilling did not locate a main mass beneath the crater floor and instead only produced traces of the projectile, Barringer began to consider other options. He had already noted several features that seem to have a directional symmetry. - snip - More recently, techniques similar to those of Sutton were applied by Holliday et al. (2005) to the Odessa impact site. They estimated the Odessa craters were produced approximately 63,000 years ago. Although the ages of Barringer and Odessa craters are still not precisely known, these approximate ages suggest Odessa formed earlier, with the caveat that the Barringer crater may be older than 49,000 yrs. (See discussion in Chapter 11). Thus, the two impact events may not be directly related and may not have any bearing on the issue of trajectory. Nonetheless, several other potential indicators of trajectory survive (and even the Odessa connection might be revived). Unfortunately, these indicators cannot be reconciled at the present time and I think it fair to conclude that the trajectory of the impacting asteroid that produced Barringer Crater remains uncertain. Chapter 9: http://www.lpi.usra.edu/publications/books/barringer_crater_guidebook/chapte r_9.pdf Whole guidebook: http://www.lpi.usra.edu/publications/books/barringer_crater_guidebook/index. shtml Regards, - John Ontario, California -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of bernd.pa...@paulinet.de Sent: Friday, September 10, 2010 3:26 AM To: Meteorite-list@meteoritecentral.com Subject: [meteorite-list] Meteor Crater Shape and Entry Angle Eric wrote: The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle. In fact the crater is more elliptical in shape. SHOEMAKER E.M. and KIEFFER S.W. (1974, 1979) Guidebook to the Geology of Meteor Crater, Arizona (Publ. No. 17, Center for Meteorite Studies, Arizona State University, Tempe, Arizona): Regional jointing has controlled the shape of the crater, which is somewhat squarish in outline; the diagonals of the square coincide with the trend of the two main sets of joints. The largest tears occur in the corners of the crater. Eric also inquired: What would a relatively low impact angle be? 10 degrees, 20 degrees? I tried to find more precise information on that but was unable to find something that might be of help here. Maybe someone else can shed more light on this! Regards, Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Venusian meteorites
Hi Mike, Chris and list, I've often wondered the same thing. Were there any studies on matching the Venusian atmosphere to some ungrouped achondrites or other meteorites, similar to gases trapped in Martian meteorites to it's atmosphere? Thanks! Carl2 MikeG wrote: ...I am going to take a wild layman stab at this one and then Sterling Webb can come in and clean up my mess. ;) LOL All of the confirmed planetary meteorites we have seen (barring the disputed Angrite-Mercury connection) come from planets further out from the sun than Earth. So I am guessing that maybe the Sun's gravitational influence would have more effect on a Venusian rock that manages to escape that acidic and hellish world... Chris wrote: Where the Venusian meteorites? __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Shape and Entry Angle
To produce an elongated crater you need a very low angle impact, on the order of only a few degrees at most. Here's a quick, but more detailed answer. Additional searches will allow reader to find explanations with as much detail (and math) as they would like. http://www.scientificamerican.com/article.cfm?id=why-are-impact-craters-al -- Richard Kowalski Full Moon Photography IMCA #1081 --- On Fri, 9/10/10, bernd.pa...@paulinet.de bernd.pa...@paulinet.de wrote: From: bernd.pa...@paulinet.de bernd.pa...@paulinet.de Subject: [meteorite-list] Meteor Crater Shape and Entry Angle To: Meteorite-list@meteoritecentral.com Date: Friday, September 10, 2010, 3:25 AM Eric wrote: The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle. In fact the crater is more elliptical in shape. SHOEMAKER E.M. and KIEFFER S.W. (1974, 1979) Guidebook to the Geology of Meteor Crater, Arizona (Publ. No. 17, Center for Meteorite Studies, Arizona State University, Tempe, Arizona): Regional jointing has controlled the shape of the crater, which is somewhat squarish in outline; the diagonals of the square coincide with the trend of the two main sets of joints. The largest tears occur in the corners of the crater. Eric also inquired: What would a relatively low impact angle be? 10 degrees, 20 degrees? I tried to find more precise information on that but was unable to find something that might be of help here. Maybe someone else can shed more light on this! Regards, Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Impactor?
The mhcmagazine picture is seen from an angle in google earth. When you look at it directly overhead, it looks like this: http://maps.google.com/?ie=UTF8ll=35.02599,-111.022038spn=0.021402,0.045276t=hz=15 Looks pretty round to me. As for the little crater to the SSW, definitely man made, but not sure for what use. -Yinan On Fri, Sep 10, 2010 at 4:59 AM, Meteorites USA e...@meteoritesusa.com wrote: Hi Sterling, Thanks for the answer, and links. Still have a question though. I'm more curious about the angle of descent. The paper mentions an angle of 45 degrees. This seems like a very safe guess. Are there any data, or information on the angle of descent other than in the paper you provided a link to. See this crater photo from Google Earth: http://www.mhcmagazine.com/images/crater.jpg The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle.In fact the crater is more elliptical in shape. It appears as if the impactor hit at an angle quite a bit shallower than 45 degrees. Is it possible the impactor came in at a shallower angle? Regards, Eric On 9/10/2010 1:34 AM, Sterling K. Webb wrote: Eric, List, That is the conclusion of the 2005 paper in Nature by Melosh and Collins. Their computer models suggest it fragmented and came in as a swarm of pieces, much slowed by the atmosphere. Here's two popular articles: http://news.nationalgeographic.com/news/2005/03/0310_050310_meteorcrater.html and http://www.astronomy.com/asy/default.aspx?c=aid=2965 Here's original paper: http://amcg.ese.ic.ac.uk/~gsc/publications/articles/download/article7.pdf Well, one page from Nature, Vol. 434, 10 March, 2005. Sterling K. Webb - - Original Message - From: Meteorites USA e...@meteoritesusa.com To: Meteorite-list meteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 10:44 AM Subject: [meteorite-list] Meteor Crater Impactor? Hi List, Can someone tell me the proposed/accepted angle of descent of the asteroid which formed Meteor Crater in AZ? Wikipedia has the impactor at 50 meters across, and velocity at 12.8 km/s. Is this accurate? Eric __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] The ultimate professional
After dealing with Marcin Cimala, PolandMet, many times, I must commend his professionalism in all areas of Meteorite Dealership. Today I received my most recent purchase, promptly and packaged securely. As is always the case, the presentation is outstanding. A clear plastic case containing the piece, beautifully documented with all pertinent information, makes for a superior additional service. The piece is immediately ready for display. Thank you Marcin. Jerry Flaherty __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Impactor?
I'm aware it looks more round from directly above crater. I purposefully captured the image from an angle to accentuate the elliptical shape of the bulges in the NW and SE corners of the crater. The point being, it's NOT round. Eric On 9/10/2010 10:12 AM, Yinan Wang wrote: The mhcmagazine picture is seen from an angle in google earth. When you look at it directly overhead, it looks like this: http://maps.google.com/?ie=UTF8ll=35.02599,-111.022038spn=0.021402,0.045276t=hz=15 Looks pretty round to me. As for the little crater to the SSW, definitely man made, but not sure for what use. -Yinan On Fri, Sep 10, 2010 at 4:59 AM, Meteorites USAe...@meteoritesusa.com wrote: Hi Sterling, Thanks for the answer, and links. Still have a question though. I'm more curious about the angle of descent. The paper mentions an angle of 45 degrees. This seems like a very safe guess. Are there any data, or information on the angle of descent other than in the paper you provided a link to. See this crater photo from Google Earth: http://www.mhcmagazine.com/images/crater.jpg The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle.In fact the crater is more elliptical in shape. It appears as if the impactor hit at an angle quite a bit shallower than 45 degrees. Is it possible the impactor came in at a shallower angle? Regards, Eric On 9/10/2010 1:34 AM, Sterling K. Webb wrote: Eric, List, That is the conclusion of the 2005 paper in Nature by Melosh and Collins. Their computer models suggest it fragmented and came in as a swarm of pieces, much slowed by the atmosphere. Here's two popular articles: http://news.nationalgeographic.com/news/2005/03/0310_050310_meteorcrater.html and http://www.astronomy.com/asy/default.aspx?c=aid=2965 Here's original paper: http://amcg.ese.ic.ac.uk/~gsc/publications/articles/download/article7.pdf Well, one page from Nature, Vol. 434, 10 March, 2005. Sterling K. Webb - - Original Message - From: Meteorites USA e...@meteoritesusa.com To: Meteorite-listmeteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 10:44 AM Subject: [meteorite-list] Meteor Crater Impactor? Hi List, Can someone tell me the proposed/accepted angle of descent of the asteroid which formed Meteor Crater in AZ? Wikipedia has the impactor at 50 meters across, and velocity at 12.8 km/s. Is this accurate? Eric __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Shape and Entry Angle
Hi John, Thanks for the details. It's interesting to note that the angle of descent is not known, though there are educated guesses or calculations. What can probably be agreed is that an impactor with an entry angle of 45* degrees could produce a round crater. Meaning of course that Meteor Crater, since it's not perfectly round as evidenced by the bulges in the NW and SE corners, must have been produced by an impactor with a trajectory much shallower than 45 degrees. Logically. Here's another question. Which direction was it traveling SE to NW or NW to SE? According to the Shoemaker paper here: http://arrowsmith410-598.asu.edu/Lectures/Lecture16/i0-8137-5402-X-2-0-399Shoemaker.pdf ...Somewhat greater energy was required if the projectile struck at an oblique angle, as suggested by the presence of faults with underthrust displacement on the north and west walls of Meteor Crater It suggests a NW direction of travel... is this correct? And how do we know? Does the underthrust displacement imply that the impactor was traveling from the SE toward the NW? Eric On 9/10/2010 8:05 AM, Kashuba wrote: Eric, Bernd, Sterling, List, David Kring of LPL put together a great guidebook for the 2007 MetSoc tour of the crater (150 pages). He is Gene Shoemakers successor as advisor to the Barringer family. He and family members lead the tour. Carolyn Shoemaker was there too. Chapter 9. Trajectory begins and ends thusly: The trajectory of the impacting asteroid is another issue of considerable debate and still unresolved. Historically, circular plan views of impact craters confounded many investigators who assumed a circular crater requires a vertical impact. They wondered why more craters are not elliptical. Gilbert and Barringer both realized that 45 degree impacts are the most probable trajectories for meteoritic material. Yet Gilbert, like many of his contemporaries, mistakenly thought a 45 degree impact produces an oval crater (Hoyt, 1987). Barringer, on the other hand, realized that a 45 degree impact will produce a round crater (Hoyt, 1987). Despite this insight, Barringer, like Gilbert, initially assumed that the northern Arizona impact had been vertical or nearly vertical and that the asteroid was buried beneath the center of the crater floor. When extensive drilling did not locate a main mass beneath the crater floor and instead only produced traces of the projectile, Barringer began to consider other options. He had already noted several features that seem to have a directional symmetry. - snip - More recently, techniques similar to those of Sutton were applied by Holliday et al. (2005) to the Odessa impact site. They estimated the Odessa craters were produced approximately 63,000 years ago. Although the ages of Barringer and Odessa craters are still not precisely known, these approximate ages suggest Odessa formed earlier, with the caveat that the Barringer crater may be older than 49,000 yrs. (See discussion in Chapter 11). Thus, the two impact events may not be directly related and may not have any bearing on the issue of trajectory. Nonetheless, several other potential indicators of trajectory survive (and even the Odessa connection might be revived). Unfortunately, these indicators cannot be reconciled at the present time and I think it fair to conclude that the trajectory of the impacting asteroid that produced Barringer Crater remains uncertain. Chapter 9: http://www.lpi.usra.edu/publications/books/barringer_crater_guidebook/chapte r_9.pdf Whole guidebook: http://www.lpi.usra.edu/publications/books/barringer_crater_guidebook/index. shtml Regards, - John Ontario, California -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of bernd.pa...@paulinet.de Sent: Friday, September 10, 2010 3:26 AM To: Meteorite-list@meteoritecentral.com Subject: [meteorite-list] Meteor Crater Shape and Entry Angle Eric wrote: The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle. In fact the crater is more elliptical in shape. SHOEMAKER E.M. and KIEFFER S.W. (1974, 1979) Guidebook to the Geology of Meteor Crater, Arizona (Publ. No. 17, Center for Meteorite Studies, Arizona State University, Tempe, Arizona): Regional jointing has controlled the shape of the crater, which is somewhat squarish in outline; the diagonals of the square coincide with the trend of the two main sets of joints. The largest tears occur in the corners of the crater. Eric also inquired: What would a relatively low impact angle be? 10 degrees, 20 degrees? I tried to find more precise information on that but was unable to find something that might be of help here. Maybe someone else can shed more light on this! Regards, Bernd __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing
Re: [meteorite-list] Meteor Crater Impactor?
According to measurements using the measuring tool on google earth. From crater rim to crater rim: NW rim to SE rim: 3,880 - 3,930 ft. NE rim to SW rim: 3,860 - 3,910 ft. I'd call that round, falling within margins of error, but I'm not gonna argue impact angles, just going to reference below: One objection to the idea of an impact origin for the lunar craters was the fact that all lunar craters are round. Astronomers assumed that most meteorites would have struck the moon at oblique angles, producing elongated craters. Barringer, however, had experimented by firing rifle bullets into rocks and mud, and had discovered that a projectile arriving at an oblique angle would nevertheless make a round hole. In 1923, Barringer's 12-year-old son Richard published an article in Popular Astronomy, using his father's rifle experiments to argue for the impact origin of the lunar craters; Barringer himself repeated the arguments a short time later in the Scientific American. Ultimately, astronomers such as A.C. Gifford were able to demonstrate that the force of an impact at astronomical speeds would result in the explosion of the meteorite. Whatever the original angle of impact, the result would be a circular crater. -Yinan On Fri, Sep 10, 2010 at 12:24 PM, Meteorites USA e...@meteoritesusa.com wrote: I'm aware it looks more round from directly above crater. I purposefully captured the image from an angle to accentuate the elliptical shape of the bulges in the NW and SE corners of the crater. The point being, it's NOT round. Eric On 9/10/2010 10:12 AM, Yinan Wang wrote: The mhcmagazine picture is seen from an angle in google earth. When you look at it directly overhead, it looks like this: http://maps.google.com/?ie=UTF8ll=35.02599,-111.022038spn=0.021402,0.045276t=hz=15 Looks pretty round to me. As for the little crater to the SSW, definitely man made, but not sure for what use. -Yinan On Fri, Sep 10, 2010 at 4:59 AM, Meteorites USAe...@meteoritesusa.com wrote: Hi Sterling, Thanks for the answer, and links. Still have a question though. I'm more curious about the angle of descent. The paper mentions an angle of 45 degrees. This seems like a very safe guess. Are there any data, or information on the angle of descent other than in the paper you provided a link to. See this crater photo from Google Earth: http://www.mhcmagazine.com/images/crater.jpg The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle.In fact the crater is more elliptical in shape. It appears as if the impactor hit at an angle quite a bit shallower than 45 degrees. Is it possible the impactor came in at a shallower angle? Regards, Eric On 9/10/2010 1:34 AM, Sterling K. Webb wrote: Eric, List, That is the conclusion of the 2005 paper in Nature by Melosh and Collins. Their computer models suggest it fragmented and came in as a swarm of pieces, much slowed by the atmosphere. Here's two popular articles: http://news.nationalgeographic.com/news/2005/03/0310_050310_meteorcrater.html and http://www.astronomy.com/asy/default.aspx?c=aid=2965 Here's original paper: http://amcg.ese.ic.ac.uk/~gsc/publications/articles/download/article7.pdf Well, one page from Nature, Vol. 434, 10 March, 2005. Sterling K. Webb - - Original Message - From: Meteorites USA e...@meteoritesusa.com To: Meteorite-listmeteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 10:44 AM Subject: [meteorite-list] Meteor Crater Impactor? Hi List, Can someone tell me the proposed/accepted angle of descent of the asteroid which formed Meteor Crater in AZ? Wikipedia has the impactor at 50 meters across, and velocity at 12.8 km/s. Is this accurate? Eric __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at
Re: [meteorite-list] Meteor Crater Shape and Entry Angle
What can probably be agreed is that an impactor with an entry angle of 45* degrees could produce a round crater. Meaning of course that Meteor Crater, since it's not perfectly round as evidenced by the bulges in the NW and SE corners, must have been produced by an impactor with a trajectory much shallower than 45 degrees. Logically. I don't know, but I wonder if the shape of the terrain upon impact(hills/gulleys etc) or perhaps a varied pattern of rock strength underground could have had some influence to the craters shape? GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] A meteor shower burst.
Last night, at about 1 AM here in Flagstaff, I was going from my rental to my house and I saw a flash on the horizon. There were no clouds, and the sky was perfectly clear, and I wondered what that flash was. I looked up into the sky, and then I saw three bright meteors, one after the other over the span of 2 seconds. They were as bright as Jupiter, which was high up, mid transit in the sky. Blue white in color they left no persistent train and were very fast, lasting maybe 1/2 th second duration, traveling 10 to 15 degrees each. I was quite amazed, as it seemed for an instant that a great meteor storm was brewing. The initial flash that caused me to look up and the three after spanning maybe 4 seconds and to see 4 meteors... I stayed out for another half hour hoping... But nothing more... Anyone else see something like that last night? Steve Schoner http://www.petroslides.com IMCA #4470 Mortgage Rates Hit 3.25% If you owe under $729k you probably qualify for Obama's Refi Program http://thirdpartyoffers.netzero.net/TGL3341/4c8a6ee4d0bdcac464fst04duc __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Shape and Entry Angle
Not at all logically. Meteor Crater was round after the impact. Its current shape is produced by the non-isotropic nature of the local geology. In essence, it has eroded into its current shape. This process is well understood. There is no evidence at all that the impactor arrived at a shallow enough angle to actually produce an oval crater. With our current crater analysis skills, I'd say any suggestion of a specific impact angle or direction is scarcely better than a pure guess. And even the reports estimating mass and velocity I view with a high degree of skepticism. Chris * Chris L Peterson Cloudbait Observatory http://www.cloudbait.com - Original Message - From: Meteorites USA e...@meteoritesusa.com To: meteorite-list@meteoritecentral.com Sent: Friday, September 10, 2010 11:37 AM Subject: Re: [meteorite-list] Meteor Crater Shape and Entry Angle Hi John, Thanks for the details. It's interesting to note that the angle of descent is not known, though there are educated guesses or calculations. What can probably be agreed is that an impactor with an entry angle of 45* degrees could produce a round crater. Meaning of course that Meteor Crater, since it's not perfectly round as evidenced by the bulges in the NW and SE corners, must have been produced by an impactor with a trajectory much shallower than 45 degrees. Logically. Here's another question. Which direction was it traveling SE to NW or NW to SE? According to the Shoemaker paper here: http://arrowsmith410-598.asu.edu/Lectures/Lecture16/i0-8137-5402-X-2-0-399Shoemaker.pdf ...Somewhat greater energy was required if the projectile struck at an oblique angle, as suggested by the presence of faults with underthrust displacement on the north and west walls of Meteor Crater It suggests a NW direction of travel... is this correct? And how do we know? Does the underthrust displacement imply that the impactor was traveling from the SE toward the NW? Eric __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Impactor?
List, The little curved structures must be stock ponds - built to capture storm runoff to water cattle on the range. They are built in streams and have training dikes. - John Ontario, California -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Yinan Wang Sent: Friday, September 10, 2010 10:12 AM To: Meteorite-list Subject: Re: [meteorite-list] Meteor Crater Impactor? The mhcmagazine picture is seen from an angle in google earth. When you look at it directly overhead, it looks like this: http://maps.google.com/?ie=UTF8ll=35.02599,-111.022038spn=0.021402,0.04527 6t=hz=15 Looks pretty round to me. As for the little crater to the SSW, definitely man made, but not sure for what use. -Yinan On Fri, Sep 10, 2010 at 4:59 AM, Meteorites USA e...@meteoritesusa.com wrote: Hi Sterling, Thanks for the answer, and links. Still have a question though. I'm more curious about the angle of descent. The paper mentions an angle of 45 degrees. This seems like a very safe guess. Are there any data, or information on the angle of descent other than in the paper you provided a link to. See this crater photo from Google Earth: http://www.mhcmagazine.com/images/crater.jpg The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle.In fact the crater is more elliptical in shape. It appears as if the impactor hit at an angle quite a bit shallower than 45 degrees. Is it possible the impactor came in at a shallower angle? Regards, Eric On 9/10/2010 1:34 AM, Sterling K. Webb wrote: Eric, List, That is the conclusion of the 2005 paper in Nature by Melosh and Collins. Their computer models suggest it fragmented and came in as a swarm of pieces, much slowed by the atmosphere. Here's two popular articles: http://news.nationalgeographic.com/news/2005/03/0310_050310_meteorcrater.htm l and http://www.astronomy.com/asy/default.aspx?c=aid=2965 Here's original paper: http://amcg.ese.ic.ac.uk/~gsc/publications/articles/download/article7.pdf Well, one page from Nature, Vol. 434, 10 March, 2005. Sterling K. Webb - - Original Message - From: Meteorites USA e...@meteoritesusa.com To: Meteorite-list meteorite-list@meteoritecentral.com Sent: Thursday, September 09, 2010 10:44 AM Subject: [meteorite-list] Meteor Crater Impactor? Hi List, Can someone tell me the proposed/accepted angle of descent of the asteroid which formed Meteor Crater in AZ? Wikipedia has the impactor at 50 meters across, and velocity at 12.8 km/s. Is this accurate? Eric __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] A meteor shower burst.
Hi Steve... Last night, at about 1 AM here in Flagstaff, I was going from my rental to my house and I saw a flash on the horizon. There were no clouds, and the sky was perfectly clear, and I wondered what that flash was. I looked up into the sky, and then I saw three bright meteors, one after the other over the span of 2 seconds. Just hunching here...but if there was a meteoric flash on the horizon, that would mean it was very far away...maybe about 250 to 400 miles away? Then as you looked up you saw 3 bright meteors overhead. I'm assuming that the 3 meteors were coming from the same direction to each other. Were they in alignment with where the flash was? It would seem to me that where the flash making meteor entered the atmosphere, it would be at a different plane to the earth than the 3 other meteors. I would think that they weren't related because of this at least. They were as bright as Jupiter, which was high up, mid transit in the sky. Blue white in color they left no persistent train and were very fast, lasting maybe 1/2 th second duration, traveling 10 to 15 degrees each. Because the 3 meteors were very fast, I'd think they were of cometary material. I was quite amazed, as it seemed for an instant that a great meteor storm was brewing. The initial flash that caused me to look up and the three after spanning maybe 4 seconds and to see 4 meteors... I stayed out for another half hour hoping... But nothing more... I think the meteor timing of what you saw were nothing more than a coincidence. Sometimes this happens. GeoZay __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Mars Odyssey THEMIS Images: September 6-10, 2010
MARS ODYSSEY THEMIS IMAGES September 6-10, 2010 o Nili Patera Dunes (06 September 2010) http://themis.asu.edu/zoom-20100906a o North Polar Dunes (07 September 2010) http://themis.asu.edu/zoom-20100907a o North Polar Dunes (08 September 2010) http://themis.asu.edu/zoom-20100908a o Meridiani Planum (09 September 2010) http://themis.asu.edu/zoom-20100909a o Labeatis Fossae (10 September 2010) http://themis.asu.edu/zoom-20100910a All of the THEMIS images are archived here: http://themis.asu.edu/latest.html NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Office of Space Science, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in co.oration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena. __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Serpent Mound Crater data needed
Hello everyone - I need the depth of Serpent Mound Crater, and in particular the height of the central rebound uplift. The tech papers all seem to be on pay sites. Do any of you have thaqt data handy? E.P. __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Mars was 'recently' habitable planet
http://tinyurl.com/35vcjtb -- Richard Kowalski Full Moon Photography IMCA #1081 __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Kosice oriented stone Sept 10 RFSPOD
Hello list members, Michael Johnson kindly posted a Rocks from Space photo on Sept 10 showing a beautifully oriented 34 gram Kosice stone. The meteorite exhibits roll over lipping on the trailing surface as well as a very frothy fusion crust. The original photos were not very good and I had better lighting this morning and have retaken the photos. Michael has very graciously replaced the old photos with the new ones: http://www.rocksfromspace.org/September_10_2010.html Worth a second look! All best, Jack __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD: Meteorite Auctions and Site Update
Dear List, I have a nice group of auctions ending in 48 hours including Batesland, Nogoya, Homestead, and several others. Most are still at .99 cents: http://shop.ebay.com/historic-meteorites/m.html Also, I have updated my sales page with a few items and curiosities: http://historicmeteorites.com/HistoricMeteorites/Sales.html Thanks for looking and have a great weekend! Mike Bandli Historic Meteorites www.HistoricMeteorites.com and join us on Facebook: www.facebook.com/Meteorites1 IMCA #5765 - __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD: 1/4 Page Ad For The Year $249
I have a 1/4 Page Full Color ad spot available in Meteorite Hunting Collecting Magazine for $249 for a whole year (6 issues). First person to contact me with payment gets it! Eric P.S. I won't post another ad till next week... __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] esquel trade (AD)
Hi list. I do not know if this ever went out,but I have a 23 gram slice of esquel for trade. Direct from bob haag hiself. I am looking for taza's,ZIZ,NWA 5549 or glorietta siderites. Please pics and if interested off list. __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD - Rare H3.6 Meteorite, Lake Murray, El Hammami, Ghubara slices, Ash Creek micros and more!
Hi Listees, All List members get 20% off everything listed below by using the coupon code metlist at checkout. I have several new offerings and one of them is a very rare H3.6 type (NWA 6283). There are only 35 H3.6 meteorites and 29 of those are Antarctics which are off-limits to collectors. I only have one specimen of this meteorite available. This meteorite is gorgeous and is wall to wall chondrules. It comes from John Higgins and was classified by Dr. Tony Irving. NWA 6283 H3.6, 3.54g slice - http://www.galactic-stone.com/product/nwa-6283--rare-h36-meteorite-loaded-with-chondrules-slice-354g Thick Ghubara endcuts (6-7g each) - http://www.galactic-stone.com/product/ghubara--classic-l5-xenolithic-meteorite--oman-1954-thick-endcut Ghubara slices (6-7g each) - http://www.galactic-stone.com/product/ghubara--classic-l5-xenolithic-meteorite--oman-1954-large-slice El Hammami large micros - http://www.galactic-stone.com/product/el-hammami--early-saharan-h5-meteorite-mauritania-1997-large-micro El Hammami small micros - http://www.galactic-stone.com/product/el-hammami--early-saharan-h5-meteorite-mauritania-1997-micro Lake Murray 110+ million years old meteorite, one large piece left - http://www.galactic-stone.com/product/lake-murray--oldest-intact-meteorite-110-million-years-old-slab Lake Murray chunks - http://www.galactic-stone.com/product/lake-murray--oldest-intact-meteorite-110-million-years-old-chunk Lake Murray micros - http://www.galactic-stone.com/product/lake-murray--oldest-intact-meteorite-110-million-years-old-micro Ash Creek micros (from Steve Arnold) - http://www.galactic-stone.com/product/ash-creek--famous-witnessed-hammer-fall-west-texas-2009 Big Indochinite biscuits and teardrops - http://www.galactic-stone.com/product/indochinite-huge-biscuit-and-teardrop-forms-very-nice I still have a few specimens remaining of NWA 6287, a rare L/LL5 meteorite that is a must have for type collectors : 29g crusted endcut - http://www.galactic-stone.com/product/nwa-6287--rare-lll5-transitionary-chondrite--big-29g-crusted-endcut 20g uncut crusted fragment - http://www.galactic-stone.com/product/nwa-6287-rare-lll5-transitionary-chondrite-big-crusted-chunk-20g 12g crusted slice with huge chondrule - http://www.galactic-stone.com/product/nwa-6287--rare-lll5-transitionary-chondrite--big-12g-slice 8.25g crusted slice - http://www.galactic-stone.com/product/nwa-6287--rare-lll5-transitionary-chondrite--825g-slice-wcrust Micros - http://www.galactic-stone.com/product/nwa-6287-rare-lll5-transitionary-chondrite-micromount Here is a display kit with 12 different meteorite types in it. This is a great starter collection and I only have one in stock - http://www.galactic-stone.com/product/meteorite-starter-type-collection--12-different-types-w-rarities Trinitite glass from the world's first atomic test. I have a large piece with a natural hole in it, and several pieces of rare red trinitite. Trinitite with hole - http://www.galactic-stone.com/product/trinitite-historic-atom-bomb-glass-big-fragment-with-natural-hole Rare red trinitite - http://www.galactic-stone.com/product/red-trinitite-historic-atom-bomb-glass-rare-red-variant-fragments Meteorite Webmasters - join the Meteorite Top Sites List to increase your traffic for free - http://meteorite.gotop100.com Feel free to contact me off-list - meteoritem...@gmail.com Thanks for looking and have a great weekend! MikeG -- -- Mike Gilmer - Galactic Stone Ironworks Meteorites Website - http://www.galactic-stone.com Facebook - http://www.facebook.com/galacticstone News Feed - http://www.galactic-stone.com/rss/126516 Twitter - http://twitter.com/galacticstone EOM - http://www.encyclopedia-of-meteorites.com/collection.aspx?id=1564 --- __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Venusian meteorites
Hi, Earlier today MikeG, Chris and I were kind of wondering about Venusian meteorites. I looked back at the archives and found a bit of discussion already between Sterling, Elton, Tracy, Howard, Mike F. and Mark F. on the subject. This discussion was way back in 2003, before my time, but it seems the questions are still out there. This interesting discussion may be worth another look. See links to the archives here: http://meteorite-identification.com/mwnews/BLECKENSTAD.htm http://www.mail-archive.com/meteorite-list@meteoritecentral.com/msg16223.html http://www.mail-archive.com/meteorite-list@meteoritecentral.com/msg16211.html Carl2 __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] esquel trade (AD)
Steve, Just my opinion, but I think you'll get a much better response if you post a link to a photo or two. Just my 2 grams. Best, Steve Steve Witt IMCA #9020 http://imca.cc/ --- On Fri, 9/10/10, steve arnold stevenarnold60...@yahoo.com wrote: From: steve arnold stevenarnold60...@yahoo.com Subject: [meteorite-list] esquel trade (AD) To: meteorite-list@meteoritecentral.com Date: Friday, September 10, 2010, 7:27 PM Hi list. I do not know if this ever went out,but I have a 23 gram slice of esquel for trade. Direct from bob haag hiself. I am looking for taza's,ZIZ,NWA 5549 or glorietta siderites. Please pics and if interested off list. __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Meteor Crater Shape and Entry Angle
How about SW to NE? I believe there are several finds along that path that match the Canyon Diablo material. -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of Meteorites USA Sent: Friday, September 10, 2010 10:38 AM To: meteorite-list@meteoritecentral.com Subject: Re: [meteorite-list] Meteor Crater Shape and Entry Angle Hi John, Thanks for the details. It's interesting to note that the angle of descent is not known, though there are educated guesses or calculations. What can probably be agreed is that an impactor with an entry angle of 45* degrees could produce a round crater. Meaning of course that Meteor Crater, since it's not perfectly round as evidenced by the bulges in the NW and SE corners, must have been produced by an impactor with a trajectory much shallower than 45 degrees. Logically. Here's another question. Which direction was it traveling SE to NW or NW to SE? According to the Shoemaker paper here: http://arrowsmith410-598.asu.edu/Lectures/Lecture16/i0-8137-5402-X-2-0-399Sh oemaker.pdf ...Somewhat greater energy was required if the projectile struck at an oblique angle, as suggested by the presence of faults with underthrust displacement on the north and west walls of Meteor Crater It suggests a NW direction of travel... is this correct? And how do we know? Does the underthrust displacement imply that the impactor was traveling from the SE toward the NW? Eric On 9/10/2010 8:05 AM, Kashuba wrote: Eric, Bernd, Sterling, List, David Kring of LPL put together a great guidebook for the 2007 MetSoc tour of the crater (150 pages). He is Gene Shoemakers successor as advisor to the Barringer family. He and family members lead the tour. Carolyn Shoemaker was there too. Chapter 9. Trajectory begins and ends thusly: The trajectory of the impacting asteroid is another issue of considerable debate and still unresolved. Historically, circular plan views of impact craters confounded many investigators who assumed a circular crater requires a vertical impact. They wondered why more craters are not elliptical. Gilbert and Barringer both realized that 45 degree impacts are the most probable trajectories for meteoritic material. Yet Gilbert, like many of his contemporaries, mistakenly thought a 45 degree impact produces an oval crater (Hoyt, 1987). Barringer, on the other hand, realized that a 45 degree impact will produce a round crater (Hoyt, 1987). Despite this insight, Barringer, like Gilbert, initially assumed that the northern Arizona impact had been vertical or nearly vertical and that the asteroid was buried beneath the center of the crater floor. When extensive drilling did not locate a main mass beneath the crater floor and instead only produced traces of the projectile, Barringer began to consider other options. He had already noted several features that seem to have a directional symmetry. - snip - More recently, techniques similar to those of Sutton were applied by Holliday et al. (2005) to the Odessa impact site. They estimated the Odessa craters were produced approximately 63,000 years ago. Although the ages of Barringer and Odessa craters are still not precisely known, these approximate ages suggest Odessa formed earlier, with the caveat that the Barringer crater may be older than 49,000 yrs. (See discussion in Chapter 11). Thus, the two impact events may not be directly related and may not have any bearing on the issue of trajectory. Nonetheless, several other potential indicators of trajectory survive (and even the Odessa connection might be revived). Unfortunately, these indicators cannot be reconciled at the present time and I think it fair to conclude that the trajectory of the impacting asteroid that produced Barringer Crater remains uncertain. Chapter 9: http://www.lpi.usra.edu/publications/books/barringer_crater_guidebook/chapte r_9.pdf Whole guidebook: http://www.lpi.usra.edu/publications/books/barringer_crater_guidebook/index. shtml Regards, - John Ontario, California -Original Message- From: meteorite-list-boun...@meteoritecentral.com [mailto:meteorite-list-boun...@meteoritecentral.com] On Behalf Of bernd.pa...@paulinet.de Sent: Friday, September 10, 2010 3:26 AM To: Meteorite-list@meteoritecentral.com Subject: [meteorite-list] Meteor Crater Shape and Entry Angle Eric wrote: The crater is not perfectly round as would be expected from an impactor coming in at a sharper angle. In fact the crater is more elliptical in shape. SHOEMAKER E.M. and KIEFFER S.W. (1974, 1979) Guidebook to the Geology of Meteor Crater, Arizona (Publ. No. 17, Center for Meteorite Studies, Arizona State University, Tempe, Arizona): Regional jointing has controlled the shape of the crater, which is somewhat squarish in outline; the diagonals of the square coincide with the trend of the two main sets
Re: [meteorite-list] A meteor shower burst.
Three meteors came from the same direction, in a 10 degree radiant from the Seven Sisters star cloud. The flash that I caught from the corner of my eye was closer to the horizon, so I did not notice a streak or persistent trail. None of the meteors I saw last night had persistent trails. Just a very bright blue white streak. Interesting to see such a flurry, Makes me wonder if there is a potentially big cometary meteor stream headed our way. Any meteor showers for Aug 8th? Steve Message: 12 Date: Fri, 10 Sep 2010 14:48:01 EDT From: geo...@aol.com Subject: Re: [meteorite-list] A meteor shower burst. To: meteorite-list@meteoritecentral.com Message-ID: 64517.1e1e0a7b.39bbd...@aol.com Content-Type: text/plain; charset=US-ASCII Hi Steve... Last night, at about 1 AM here in Flagstaff, I was going from my rental to my house and I saw a flash on the horizon. There were no clouds, and the sky was perfectly clear, and I wondered what that flash was. I looked up into the sky, and then I saw three bright meteors, one after the other over the span of 2 seconds. Just hunching here...but if there was a meteoric flash on the horizon, that would mean it was very far away...maybe about 250 to 400 miles away? Then as you looked up you saw 3 bright meteors overhead. I'm assuming that the 3 meteors were coming from the same direction to each other. Were they in alignment with where the flash was? It would seem to me that where the flash making meteor entered the atmosphere, it would be at a different plane to the earth than the 3 other meteors. I would think that they weren't related because of this at least. They were as bright as Jupiter, which was high up, mid transit in the sky. Blue white in color they left no persistent train and were very fast, lasting maybe 1/2 th second duration, traveling 10 to 15 degrees each. Because the 3 meteors were very fast, I'd think they were of cometary material. I was quite amazed, as it seemed for an instant that a great meteor storm was brewing. The initial flash that caused me to look up and the three after spanning maybe 4 seconds and to see 4 meteors... I stayed out for another half hour hoping... But nothing more... I think the meteor timing of what you saw were nothing more than a coincidence. Sometimes this happens. GeoZay EXPOSED: Make $99/hr Online BREAKING NEWS: People are beating the recession by working at home. http://thirdpartyoffers.netzero.net/TGL3341/4c8afce14609aaef4dfst05duc __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Rust Question about my stone meteorite.
Hello Listers, I have a question about rust and how to clean it off your L6 meteorite. Now can you just soak the meteorite in a 99% alcohol bath for a couple days and the rust on the surface will some what come off the surface or are there other steps? The the size of the L6 fragment is 3.45g, so I dont have much room to work with. I used a sand/finger nail file and sanded the surface, but not sure if that made a difference and it seems that the L6 meteorite surface is stronger than the sand paper on the finger nail file. If any Listers have some suggestions let me know please :) Shawn Alan IMCA 1633 eBaystore http://shop.ebay.com/photophlow/m.html?_nkw=_armrs=1_from=_ipg=_trksid=p4340 __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD - Meteorites for sale
Offerings from the Stephan collection: Twodot 126.70 grams H6 NWA 3163 ten grams of lunar dust NWA 3117 15.0 grams HOW NWA 753 24.90 grams R3.9 Claxton part slices-various weights NWA 3151 2.40 grams Brachinite NWA 4473 8.8 grams DIO Weston various sizes Sikhote-Alin various sizes Please e-mail Twink Monrad off-list for more information larrytwinkmon...@comcast.net __ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
