[meteorite-list] Meteorite Picture of the Day
Today's Meteorite Picture of the Day: Tenham Contributed by: Shawn Alan http://www.tucsonmeteorites.com/mpodmain.asp __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
[meteorite-list] NWA 8534 CM1/2 - A few small crusted specimens left
Hi all, New week new ad. First of all, thanks for all the emails about this fantastic new meteorite NWA 8534. It is the best selling meteorite I've had in years! If you haven't purchased one of these rare specimens yet here is your chance to get a small specimen with at least some crust. http://www.mrmeteorite.com/nwa8534cm12.htm I do have a few 1-2 gram lots of un-crusted fragments at a little better price. In fact there is one lot at the bottom of the page that consists of tiny tiny fragments @ only $200 per gram http://www.mrmeteorite.com/nwa8534cm12.htm ALL MY EBAY AUCTIONS HERE http://www.ebay.com/sch/mr-meteorite/m.html?item=221550504307ssPageName=STRK%3AMESELX%3AITrt=nc_trksid=p2047675.l2562_vilcat=3239 -- Rock On! Ruben Garcia http://www.MrMeteorite.com __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] New Hoba Search
Hi Bob - 100-150 parent bodies now, but was there a parent body for them? One whose disruption led to the LPBE, and the shift of the outer gas giants? How does a person account for the formation of peridot in iron without one? No doubt gravitational effects shift Long Period Comets onto the plane of the planets, but perhaps many don't get that far and accrete before then. It is interesting that Hoba has no crater. I guess we'll see how this meteorite search goes. Such Grand Problems. I tend to work with the little ones. E.P. E.P., There are many more parent bodies for meteorites - at least 100-150 at last count. As for comets, they have orbital inclinations at every imaginable angle, so his hypothesis that most impacts are at 23.5° can't be due to comets. You're right about not knowing the composition of comet centers, but given their generally tiny size, the likelihood of them differentiating to produce an iron core is very remote. Their very iciness implies they didn't differentiate to a significant degree. Asteroids are also inclined at a variety of angles with the average inclination of 8.2° of the ecliptic plane. While I wish him well in his research and hope he finds meteorite fragments in every dry lake, his understanding of comets vs. asteroids seems flawed to me as does the idealized 23.5° angle of entry. Best wishes and good luck with the Brenham artifact project. Bob __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
[meteorite-list] Are the Great Dismal Swamp and Lake Drummond Impact Structures?
Hello Everyone - While there are many swamps along the east coast of North America, according to the note on wikipedia, Scientists believe the Great Dismal Swamp was created upon the last major shift of the continental shelf. The origin of Lake Drummond, one of only two natural lakes in Virginia, is not entirely clear. As I was reading through The Fabulous History of the Dismal Swamp Company by Charles Royster for background on the finances of the colonial land theives, I came upon this passage: (page 423) In addition to felling stands of white cedar, they found many large trunks of trees lying on top of one another, covered by water and LAYERS of PEAT. (my emphasis) The great fire of 1806 and other fires left many blackened trees but also brought to view and into use, more good timber than they injured, by burning the soil down to where numerous trees had lain perhaps fpr a century concealed, and their existence unsuspected, citing contemporary reports. Perhaps both structures form an astrobleme, with Lake Drummond being the crater, and the swamp defining the blast zone. While there is no way of knowing without a geological survey, one could hypothesize an impact several times larger than Tunguska (the fallen trees), but whether an airbust or ground impact is unclear. As far as dates go, they may have been formed far earlier than 100 years ago, as indicated by the peat. In any case, as they are near NASA Langley, perhaps someone local will look into them. While their presence is no certainty of a local impact, a very large concentration of impactites may be present in the soil there. While I know people who earn their living recovering geological specimens from swamps, they prefer certainties, and a meteorite search would likely be too speculative for them. If you have say scuba equipment, and know exactly what the hell you are doing, perhaps it may a very good place to hunt. One never knows for sure until one looks... (PS - I'd like to add that given the muck, heat, insects, and the poison ivy, I feel that this kind of search would be a perfectly wonderful project for Mr. Boslough. Too bad there are only poisonous snakes in the swamp, and no alligators.) good hunting all, E.P. Grondine Man and Impact in the Americas __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
[meteorite-list] Fw: wanted meteorite metal ingots made from scrap and filings
Subject: wanted meteorite metal ingots made from scrap and filings Thank you please contact me off list. Thank you. Dirk __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com https://pairlist3.pair.net/mailman/listinfo/meteorite-list
[meteorite-list] NASA's Newest Mars Mission Spacecraft Enters Orbit around Red Planet (MAVEN)
http://www.jpl.nasa.gov/news/news.php?release=2014-318 NASA's Newest Mars Mission Spacecraft Enters Orbit around Red Planet September 21, 2014 NASA's Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft successfully entered Mars' orbit at 7:24 p.m. PDT (10:24 p.m. EDT) Sunday, Sept. 21, where it now will prepare to study the Red Planet's upper atmosphere as never done before. MAVEN is the first spacecraft dedicated to exploring the tenuous upper atmosphere of Mars. As the first orbiter dedicated to studying Mars' upper atmosphere, MAVEN will greatly improve our understanding of the history of the Martian atmosphere, how the climate has changed over time, and how that has influenced the evolution of the surface and the potential habitability of the planet, said NASA Administrator Charles Bolden. It also will better inform a future mission to send humans to the Red Planet in the 2030s. After a 10-month journey, confirmation of successful orbit insertion was received from MAVEN data observed at the Lockheed Martin operations center in Littleton, Colorado, as well as from tracking data monitored at NASA's Jet Propulsion Laboratory navigation facility in Pasadena, California. The telemetry and tracking data were received by NASA's Deep Space Network antenna station in Canberra, Australia. NASA has a long history of scientific discovery at Mars and the safe arrival of MAVEN opens another chapter, said John Grunsfeld, astronaut and associate administrator of the NASA Science Mission Directorate at the agency's Headquarters in Washington. Maven will complement NASA's other Martian robotic explorers-and those of our partners around the globe-to answer some fundamental questions about Mars and life beyond Earth. Following orbit insertion, MAVEN will begin a six-week commissioning phase that includes maneuvering into its final science orbit and testing the instruments and science-mapping commands. MAVEN then will begin its one Earth-year primary mission, taking measurements of the composition, structure and escape of gases in Mars' upper atmosphere and its interaction with the sun and solar wind. It's taken 11 years from the original concept for MAVEN to now having a spacecraft in orbit at Mars, said Bruce Jakosky, MAVEN principal investigator with the Laboratory for Atmospheric and Space Physics at the University of Colorado, Boulder (CU/LASP). I'm delighted to be here safely and successfully, and looking forward to starting our science mission. The primary mission includes five deep-dip campaigns, in which MAVEN's periapsis, or lowest orbit altitude, will be lowered from 93 miles (150 kilometers) to about 77 miles (125 kilometers). These measurements will provide information down to where the upper and lower atmospheres meet, giving scientists a full profile of the upper tier. This was a very big day for MAVEN, said David Mitchell, MAVEN project manager from NASA's Goddard Space Flight Center, Greenbelt, Maryland. We're very excited to join the constellation of spacecraft in orbit at Mars and on the surface of the Red Planet. The commissioning phase will keep the operations team busy for the next six weeks, and then we'll begin, at last, the science phase of the mission. Congratulations to the team for a job well done today. MAVEN launched Nov. 18, 2013, from Cape Canaveral Air Force Station in Florida, carrying three instrument packages. The Particles and Fields Package, built by the University of California at Berkeley with support from CU/LASP and Goddard, contains six instruments that will characterize the solar wind and the ionosphere of the planet. The Remote Sensing Package, built by CU/LASP, will identify characteristics present throughout the upper atmosphere and ionosphere. The Neutral Gas and Ion Mass Spectrometer, provided by Goddard, will measure the composition and isotopes of atomic particles. The spacecraft's principal investigator is based at CU/LASP. The university provided two science instruments and leads science operations, as well as education and public outreach, for the mission. NASA Goddard Space Flight Center manages the project and also provided two science instruments for the mission. Lockheed Martin built the spacecraft and is responsible for mission operations. The Space Sciences Laboratory at the University of California at Berkeley provided four science instruments for MAVEN. JPL provides navigation and Deep Space Network support, and Electra telecommunications relay hardware and operations. JPL, a division of the California Institute of Technology in Pasadena, manages the Mars Exploration Program for NASA. To learn more about the MAVEN mission, visit: http://www.nasa.gov/maven and http://mars.nasa.gov/maven/ Dwayne Brown Headquarters, Washington 202-358-1726 dwayne.c.br...@nasa.gov Nancy Neal-Jones / Elizabeth Zubritsky Goddard Space Flight Center, Greenbelt, Maryland 301-286-0039 / 301-614-5438
