[meteorite-list] Old guy doesn't find meteorite
http://www.heraldtribune.com/article/20080730/ARTICLE/807300323/-1/newssitemap# __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Old guy doesn't find meteorite
> The cell phone-sized, 4-ounce stone... [he] > described the rock as flat on one side, > rusty and covered with little volcanoes. But, you would have to admit that this makes the Sarasota Stone the record holder for the smallest magmatic volcanic minor planet! Sterling K. Webb - - Original Message - From: "Darren Garrison" <[EMAIL PROTECTED]> To: "Meteorite List" Sent: Wednesday, July 30, 2008 9:28 AM Subject: [meteorite-list] Old guy doesn't find meteorite http://www.heraldtribune.com/article/20080730/ARTICLE/807300323/-1/newssitemap# __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Dawn Journal - July 27, 2008
http://dawn.jpl.nasa.gov/mission/journal_7_27_08.asp Dawn Journal Dr. Marc Rayman July 27, 2008 Dear Dawnminants, Dawn continues its flight through the solar system with all systems functioning well. It is vitally important that the spacecraft is reliably staying on course and on schedule, gently and steadily thrusting with the bluish glow of its ion propulsion system; yet that doesn't lend itself to the sorts of spine-tingling, heart-pounding, hair-raising, planet-shattering logs for which Dawn is famous (at least among immigrants from brown dwarf systems reading these reports in the vicinities of active galactic nuclei). So let's turn out attention to consider a particular aspect of flying a mission with ion propulsion. We crave power!! Perhaps that requires a bit more detailed consideration... Engineers are developing a method to determine how much power the solar arrays can produce. It might seem odd that with the spacecraft having been in interplanetary flight for 10 months, engineers don't already know the answer. (Other facts might seem odd as well, such as the phrase "nihil ad rem" being in this sentence. This log will address only one oddity however.) When the spacecraft was at Earth's distance from the Sun, shortly after launch, the solar arrays would have been able to supply more than 10 kilowatts, enough to operate about 10 average homes in the US (and nearly as much as your correspondent's cat Regulus generates when Mr. Vacuum Cleaner emerges from his closet). Dawn cannot use that much electrical power, but as it pushes deeper into space, the weaker illumination by the Sun will yield less power. The craft's two solar array wings, each about 2.3 by 8.3 meters (more than 7 by 27 feet), were designed to be large enough to meet the needs of the power-hungry ion propulsion system plus all other spacecraft systems even in orbit about dwarf planet Ceres. To thrust at nearly twice Mars' average distance from the Sun, Dawn carries the most powerful solar arrays ever used on an interplanetary mission. The only way to measure the power of the arrays is for the spacecraft actually to pull the power from them, and its ability to do that is limited. When thrusting at full throttle and using all systems normally, Dawn consumes 3.2 kilowatts. Even now, traveling farther from the Sun than Mars ever ventures, the solar arrays can provide about 4 kilowatts. If the spacecraft activated all of its nonessential components, it still could not draw this much power. That leaves engineers without an accurate determination of the full potential of the arrays. Of course, engineers thoroughly tested the electrical power system before launch, including each of the 11,480 solar cells and all other components, and from that they constructed a mathematical simulation of the arrays. But laboratory measurements do not perfectly reproduce conditions in space, so the computational model has some uncertainty. In-flight measurements are needed to improve their simulation of how much power the solar arrays can furnish at different distances from the Sun. Who cares how much power is available? Well, first and foremost, our readers do! After all, you've gotten this far (and even farther right now) in this log, so you must have some reason for spending otherwise good time reading about the solar arrays. The Dawn project appreciates your interest, and we want to provide the information you apparently seek, even though we have no idea why you suddenly are eager to understand the solar array performance. As it turns out though, there is another reason for establishing the true capability of the solar arrays. As explained in many (but fewer than 10,001) previous logs, Dawn's unique mission is possible only through the persistent use of its ion propulsion system. Rather than thrusting for minutes, as most spacecraft do, Dawn will thrust for years As power diminishes in the dim depths of space, Dawn must throttle its ion thruster to lower power (and lower thrust) levels. Because the throttle level depends on how much power is available, to formulate the details of the craft's trajectory and other plans for the mission, engineers require knowledge of how much power the arrays will provide at any distance from the Sun. After all, it is misleading to think of ion thrusting as an ion propulsion subsystem function; rather, it is a spacecraft system function, requiring most subsystems to operate together. Apart from the inevitable (and quite unpredictable) glitches and anomalies on the spacecraft and appearances of cake in mission control, and contrary to many people's preconceived notions, since well before launch the greatest technical uncertainty in the planning of Dawn's flight has been what the solar array power will be. So far, mission engineers have incorporated a reasonable, but conservative, estimate into the solar array simulation, but to refine the plans, they need to verify or correct the numbers. Although the arrays prod
[meteorite-list] Saturn's Moon Titan Has A Liquid Surface Lake
First confirmed existence of a lake of any liquid on the surface of any planet or body in the solar system -- the envelope, please! -- goes to Titan. The lake is liquid ethane. There are seas, lake, and rivers seen in the region of the North Pole, and the prevailing suspicion (but no proof) has been that they are methane, but now ethane may seem more likely. This lake is located near the South Pole, is named Ontario Lactus, or Lake Ontario. It's about the same size as Earth's Lake Ontario; the existence of a Canada on its north shore has not been confirmed. No lakes or seas have been seen outside the polar regions. Evidence suggests that "rain" falls only at the Poles, where the lakes are. Oddly, cold as Titan is, it may be that it is too "hot" for rain and bodies of water except at the Poles and that the hazy atmosphere is, in effect, cold "steam." Full text of the press release is below. Sterling K. Webb http://www.sciencedaily.com/releases/2008/07/080730140726.htm Scientists have confirmed that at least one body in our solar system, other than Earth, has a surface liquid lake. Using an instrument on NASA's Cassini orbiter, they discovered that a lake-like feature in the south polar region of Saturn's moon, Titan, is truly wet. The lake is about 235 kilometers, or 150 miles, long. The visual and infrared mapping spectrometer, or VIMS, an instrument run from The University Arizona, identifies the chemical composition of objects by the way matter reflects light. When VIMS observed the lake, named Ontario Lacus, it detected ethane, a simple hydrocarbon that Titan experts have long been searching for. The ethane is in liquid solution with methane, nitrogen and other low-molecular weight hydrocarbons. "This is the first observation that really pins down that Titan has a surface lake filled with liquid," VIMS principal investigator and professor Robert H. Brown of UA's Lunar and Planetary Laboratory said. Brown and his team report their results in the July 31 issue of the journal Nature. "Detection of liquid ethane in Ontario Lacus confirms a long-held idea that lakes and seas filled with methane and ethane exist on Titan," said Larry Soderblom of the U.S. Geological Survey, Flagstaff, Ariz. The fact that the VIMS could detect the spectral signatures of ethane on the moon's dimly lit surface while viewing at a highly slanted angle through Titan's thick atmosphere "raises expectations for exciting future lake discoveries by the infrared spectrometer," Soderblom, an interdisciplinary Cassini scientist, said. The ubiquitous hydrocarbon haze in Titan's atmosphere hinders the view to Titan's surface. But there are transparent atmospheric "windows" at certain infrared light wavelengths through which Cassini's VIMS can see to the ground. VIMS observed Ontario Lacus on Cassini's 38th close flyby of Titan in December 2007. The lake is roughly 20,000 square kilometers, or 7,800 square miles, just slightly larger than North America's Lake Ontario, Brown said. Infrared spectroscopy doesn't tell the researchers how deep the lake is, other than it must be at least a centimeter or two, or about three-quarters of an inch, deep. "We know the lake is liquid because it reflects essentially no light at 5-micron wavelengths," Brown said. "It was hard for us to accept the fact that the feature was so black when we first saw it. More than 99.9 percent of the light that reaches the lake never gets out again. For it to be that dark, the surface has to be extremely quiescent, mirror smooth. No naturally produced solid could be that smooth." VIMS observations at 2-micron wavelengths shows the lake holds ethane. The scientists saw the specific signature of ethane as a dip at the precise wavelength that ethane absorbs infrared light. Tiny ethane particles almost as fine as cigarette smoke are apparently filtering out of the atmosphere and into the lake, Brown said. Ethane is a simple hydrocarbon produced when ultraviolet light from the sun breaks up its parent molecule, methane, in Titan's methane-rich, mostly nitrogen atmosphere. Before the Cassini mission, several scientists thought that Titan would be awash in global oceans of ethane and other light hydrocarbons, the byproducts of photolysis, or the action of ultraviolet light on methane over 4.5 billion years of solar system history. But 40 close flybys of Titan by the Cassini spacecraft show no such oceans exist. The observations also suggest the lake is evaporating. The lake is ringed by a dark beach, where the black lake merges with the bright shoreline. "We can see there's a shelf, a beach, that is being exposed as the lake evaporates," Brown said. That the beach is darker than the shoreline could mean that the "sand" on the beach is wet with organics, or it could be covered with a thin layer of liquid organics, he said. The
[meteorite-list] (AD) more meteorites forsale
Hi again list.I have 4 meteorites forsale.I have 2 NWA 1685 Individuals (82 grams $150) and (90 grams $200).I also have a 234 gram endcut of (nwa 788 $200).And I have a 300 gram slice of (SAU 001 $175.00)I have pics of all of them,plus free shipping.Let me know offlist.No more ad posts after this one. steve arnold __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] (AD) more meteorites forsale
Steve, Do you have pics of the 1685? Please let me have first dibs. Mike - Original Message - From: "steve arnold" <[EMAIL PROTECTED]> To: Sent: Wednesday, July 30, 2008 6:15 PM Subject: [meteorite-list] (AD) more meteorites forsale Hi again list.I have 4 meteorites forsale.I have 2 NWA 1685 Individuals (82 grams $150) and (90 grams $200).I also have a 234 gram endcut of (nwa 788 $200).And I have a 300 gram slice of (SAU 001 $175.00)I have pics of all of them,plus free shipping.Let me know offlist.No more ad posts after this one. steve arnold __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Old guy doesn't find meteorite
Hey, I know this guy! He send Geoff and I rocks all the time... oh wait.. It is just the 4,000 other people like him... I am mistaken... ha ha -Leigh Anne DelRay --- On Wed, 7/30/08, Sterling K. Webb <[EMAIL PROTECTED]> wrote: > From: Sterling K. Webb <[EMAIL PROTECTED]> > Subject: Re: [meteorite-list] Old guy doesn't find meteorite > To: [EMAIL PROTECTED], "Meteorite List" > Date: Wednesday, July 30, 2008, 10:44 AM > > The cell phone-sized, 4-ounce stone... [he] > > described the rock as flat on one side, > > rusty and covered with little volcanoes. > > But, you would have to admit that this makes the > Sarasota Stone the record holder for the smallest > magmatic volcanic minor planet! > > > Sterling K. Webb > - > - Original Message - > From: "Darren Garrison" > <[EMAIL PROTECTED]> > To: "Meteorite List" > > Sent: Wednesday, July 30, 2008 9:28 AM > Subject: [meteorite-list] Old guy doesn't find > meteorite > > > http://www.heraldtribune.com/article/20080730/ARTICLE/807300323/-1/newssitemap# > __ > http://www.meteoritecentral.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > > __ > http://www.meteoritecentral.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD(?) Foote Recovery Auction
Hello Everyone, I mentioned in a past post that the high bids page for the Foote Recovery Auction would be updated more often when it was warranted. It's time! The first group of the silent auctions end tonight starting at 7:00 pm Pacific Standard Time and the second group end tomorrow night starting at 7:00 pm PST. The high bids page will be updated frequently starting this afternoon so please feel free to check it often. Don't forget to refresh the page each time you visit. These items end tonight (all times are PST): 7:00 91.2 gram Vaca Muerta Individual 7:15 Small brick from the Nininger Museum - It's sculpted! 7:30 Carancas 0.10 gram micro - With a visible clast! 7:45 Lot of six meteorite publications 8:00 Nininger/Canyon Diablo Coin/Medallion - RARE! 8:15 Libyan Desert Glass, 11.7 grams - With a hole and dark streak! 8:30 Poster "Asteroids and Meteorites" 8:45 Bassikounou Fragment, 167.2 grams - Everything you'd want in a Bassi! 9:00 Silicated Campo Slice I am ready for a flurry of bids so bring it on! You have all done a great thing for the Foote's by participating in the auction. Thank you very much. Maria http://www.meteoriteimpact.com/footeauction.htm __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] One hundred years ago …
I believe this to be from a British Columbia newspaper. Mike http://us.mc330.mail.yahoo.com/mc/compose?.rand=1994561373&uc=0 One hundred years ago … Published: July 28, 2008 5:00 PM Updated: July 28, 2008 5:35 PM The following article appeared in the Ladysmith-Chemainus Chronicle’s first-ever year of publication, in 1908. 1908 Message from Mars Willie McKinnon, the fourteen year old son of Mr. Angus McKinnon underwent a most startling experience, and had a miraculous escape from death on last Thursday morning. While working in his father’s garden about half past eleven o’clock, a meteor about ten inches long was hurled through space and buried itself in the ground about eight feet from where the boy was standing. The meteor could be heard coming for several minutes before it struck the earth, but the lad thinking it was a train passing, took no notice until the celestial visitor struck the earth, sending the rocks flying in every direction and causing an effect like an earthquake in that vicinity. The boy was naturally greatly alarmed at the occurrence and rushed into the house to acquaint his parents with the very strange happening. On visiting the spot it was found that the meteor was still intensely hot, and not for over half an hour could it be handled. The meteor or whatever it was that fell looked much like an ordinary boulder except that it was almost as round as a marble and the surface was deeply scored with what resembled hieroglyphics. The meteorite had passed through the branches of two trees in its flight snapping them off like matches. It fell at an angle of about forty-five degrees and was traveling in a north-westerly direction when it struck the earth. Mr. McKinnon has spent most of his time since the incident trying to interpret the meaning of the markings on the stone and will be glad if someone who has knowledge of these things will try and help him out. __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Tuesday night meteor
Hello List, Last night at 8:01PM Arizona Time, I saw a great meteor in the Southern sky. At first, I thought it was the landing lights for an airplane ( I live just two miles from a small airport) but it was traveling too fast. The two fireballs divided into six with four of them going dark quite quickly. The fifth extinguished and just one fireball continued on brightly for about three seconds. Event started at 180degrees from my location in Tempe, Arizona and was 35 degrees above horizon. Anyone else see it? Best, John Gwilliam Too many people were born on third base and go through life thinking they hit a triple. __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Old guy doesn't find meteorite
Darren and others- No, he probably didn't. But if it is special to him and fulfills his hopes- I say let him be. Mike --- On Wed, 7/30/08, Darren Garrison <[EMAIL PROTECTED]> wrote: > From: Darren Garrison <[EMAIL PROTECTED]> > Subject: [meteorite-list] Old guy doesn't find meteorite > To: "Meteorite List" > Date: Wednesday, July 30, 2008, 10:28 AM > http://www.heraldtribune.com/article/20080730/ARTICLE/807300323/-1/newssitemap# > __ > http://www.meteoritecentral.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Old guy doesn't find meteorite
On Wed, 30 Jul 2008 19:15:36 -0700 (PDT), you wrote: >Darren and others- > No, he probably didn't. But if it is special to him and fulfills his hopes- > I say let him be. So, better a comforting lie than a disappointing truth? How far should that extend-- should any experts that he asks lie to him, too, just to comfort him? Maybe best that they lie, then wait until he dies to tell his children/grandchildren that he wanted to "pass it on to" the truth? At least a museum (where he thought it might end up) would (hopefully) know better than to display it... Think he would enjoy being patronized just because he is old, or do you think he'd be insulted by it? __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] AD - Site update
Hello List, And this is mostly for Thin-Sections enthusiasts. While waiting for the arrival of new and very interesting new pieces, I just thoroughly reformatted my thin-section Catalog, so now I can post pictures there. Take a look: _http://www.impactika.com/TSlist.htm_ (http://www.impactika.com/TSlist.htm) Only a few pictures right now, but more will be added as time allows. And more thin-sections should be coming very soon too. Enjoy. Anne M. Black www.IMPACTIKA.com [EMAIL PROTECTED] Vice-President of IMCA _www.IMCA.cc_ (http://www.IMCA.cc) **Get fantasy football with free live scoring. Sign up for FanHouse Fantasy Football today. (http://www.fanhouse.com/fantasyaffair?ncid=aolspr000520) __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] Tuesday night meteor
Hello all Last night while not sleeping I was listening to George Noory on Coast to Coast and a gal said she had just seen a Meteor flash across the sky and it was the biggest she had ever seen. Believe she was in CA. Might get a time from them. Wayne - Original Message - From: "JKGwilliam" <[EMAIL PROTECTED]> To: Sent: Wednesday, July 30, 2008 7:03 PM Subject: [meteorite-list] Tuesday night meteor Hello List, Last night at 8:01PM Arizona Time, I saw a great meteor in the Southern sky. At first, I thought it was the landing lights for an airplane ( I live just two miles from a small airport) but it was traveling too fast. The two fireballs divided into six with four of them going dark quite quickly. The fifth extinguished and just one fireball continued on brightly for about three seconds. Event started at 180degrees from my location in Tempe, Arizona and was 35 degrees above horizon. Anyone else see it? Best, John Gwilliam Too many people were born on third base and go through life thinking they hit a triple. __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Meteor or supernova tonight?
Hi all, About 1 hour ago (somewhere between 11:20pm and 11:40pm Mountain timezone) while walking in my Superior, Colorado neighborhood I saw something in the western sky that was really cool. The thing that caught my eye was a star that brightened and brightened (so it was as bright as Jupiter) and then it faded away. It took between 5 and 10 seconds for the whole thing to occur until I couldn't see it anymore. At first I thought it might be a meteor coming toward me from the west, but I didn't see much (if any) movement. It just brightened and faded. I was still walking, so my perspective might've been off with the motion of me moving (so background trees and houses would've been "moving" also). I guess it could still be a meteor, but it seemed more like a supernova (although those take a lot longer to brighten and fade). I didn't hear anything, but I am near a somewhat busy highway. It definitely was NOT an airplane. No blinking lights and not much movement. It was between the stars Arcturus (in Bootes) and Antares (in Scorpius) possibly in the Serpens constellation, like near M5 (Messier 5). I think it was closer to Arcturus (maybe 10 degrees to the south of it) and slightly higher in the sky, but there were several bright street lights in that direction, so I couldn't get a more exact location for it. Sorry. Did anyone else see it? Maybe Chris Peterson at his Cloudbait Observatory in Guffy, CO got a video of it? I also saw two definite meteors during my 20 minute walk. Regards, Bob Loeffler COMETS http://www.peaktopeak.com/comets/ __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
