Re: [meteorite-list] Chelyabinsk Meteorite Sheds Light on Dinosaur Extinction Mystery
Hi Vishnu and Larry, This is why I love the Meteorite List so much. Ask a layman question, and get scientists who will gladly answer that question. :) Thanks to both of you for taking the time to answer my query and improve my understanding. So, we still do not know the composition of the KT impactor. Does anyone else find it surprising that there are no extant remnants of this impactor? Or, is the fossil meteorite found by Frank Kyte considered to be such a remnant? Granted, the impact happened a very long time ago, but would not an impact of that scale leave behind something that would still remain today? Best regards, MikeG -- - Web - http://www.galactic-stone.com Facebook - http://www.facebook.com/galacticstone Twitter - http://twitter.com/galacticstone Pinterest - http://pinterest.com/galacticstone - On 7/16/14, Vishnu Reddy wrote: > Hi Mike > > The original link between Baptistina Family and the K/T impactor was > proposed based on the composition of the "fossil" meteorite that was > discovered in the K/T layer by Frank Kyte at UCLA. > Here is a quote from his 1998 paper. > > "The fossil meteorite from DSDP Hole 576 appears to be from (1) a chondritic > meteorite with (2) significant amounts of metal and sulphide (4-8%), (3) > large inclusions [larger than 200 um] of mafic minerals that also contained > metal, and (4) 30-60% fine-grained matrix. The known meteorite groups that > best fit these criteria could be the CV, CO, and CR carbonaceous > chondrites." > > Bottke et al. proposed the link between K/T impactor and Baptistina family > based on dynamical evidence and also the colors (very rudimentary analog for > composition). Baptistina asteroid family seems to have lower albedo and > weaker absorption bands similar to what one would expect for a carbonaceous > asteroid. > > We looked at several members of Baptistina asteroid family and got their > near-IR spectra to constrain their surface composition. What we noted was > that Baptistina family asteroid spectra looked very similar to the > background Flora family but were subdued by some unknown darkening material. > The mineralogy of Baptistina suggested that they were similar to LL > chondrites just like the Floras. We also looked for OH/H2O absorption bands > in Baptistina asteroid family and found none. Our rationale there was if > some of them were mixtures of LL chondrite material and carbonaceous then > they could show such a feature. We see these OH/H2O bands in some of the > carbonaceous meteorites under the right laboratory conditions on Earth. We > found no such evidence and so ruled out the possibility of the darkening > agent being a carbonaceous impactor like we see on Vesta. There is no > evidence from LL chondrites for widespread carbonaceous xenoliths like we > see in howardites. So there is also not much support from the meteoritical > side. Shock darkening and impact melt that we see on Chelyabinsk seems to be > the most logical way to explain the spectral properties observed on > Baptistina family. > > The take away message would be that if BAF is the source of the K/T impactor > then K/T impactor is not carbonaceous contrary to what Kyte reports. A more > logical conclusion would be that Baptistina Asteroid Family had nothing to > do with the K/T impactor in the first place and the compositional link > between the K/T impactor and BAF asteroids is not valid in light of what we > see in Chelyabinsk. So the original hypothesis that K/T impactor might be > carbonaceous remains. > > I hope that clears the air. > > Regards > Vishnu Reddy > > > > On Jul 16, 2014, at 3:23 PM, Galactic Stone & Ironworks via Meteorite-list > wrote: > >> This is an interesting theory. But, how does Chelyabinsk completely >> rule out a carbonaceous KT impactor? Until we recover an extant >> sample of the KT impactor, the question is still unanswered. Yes, >> there are dark meteorites that are not carbon-rich. But how does this >> fact rule out a carbonaceous (or any) impactor for the KT impact? Am >> I missing something? >> >> Best regards, >> >> MikeG >> >> -- >> - >> Web - http://www.galactic-stone.com >> Facebook - http://www.facebook.com/galacticstone >> Twitter - http://twitter.com/galacticstone >> Pinterest - http://pinterest.com/galacticstone >> - >> >> >> On 7/16/14, Ron Baalke via Meteorite-list >> wrote: >>> >>> >>> NEWS RELEASE FROM THE PLANETARY SCIENCE INSTITUTE >>> >>> FROM: >>> Alan Fischer >>> Public Information Officer >>> Planetary Science Institute >>> 520-382-0411 >>> 520-622-6300 >>> fisc...@psi.edu >>> >>> Russian Meteorite Sheds Light on Dinosaur Extinction Mystery >>> >>> July 16, 2014, Tucson, Ariz. -- A long-standing debate about the source >>> of >>> the asteroid that im
Re: [meteorite-list] Chelyabinsk Meteorite Sheds Light on Dinosaur Extinction Mystery
Hi Mike The original link between Baptistina Family and the K/T impactor was proposed based on the composition of the "fossil" meteorite that was discovered in the K/T layer by Frank Kyte at UCLA. Here is a quote from his 1998 paper. "The fossil meteorite from DSDP Hole 576 appears to be from (1) a chondritic meteorite with (2) significant amounts of metal and sulphide (4-8%), (3) large inclusions [larger than 200 um] of mafic minerals that also contained metal, and (4) 30-60% fine-grained matrix. The known meteorite groups that best fit these criteria could be the CV, CO, and CR carbonaceous chondrites." Bottke et al. proposed the link between K/T impactor and Baptistina family based on dynamical evidence and also the colors (very rudimentary analog for composition). Baptistina asteroid family seems to have lower albedo and weaker absorption bands similar to what one would expect for a carbonaceous asteroid. We looked at several members of Baptistina asteroid family and got their near-IR spectra to constrain their surface composition. What we noted was that Baptistina family asteroid spectra looked very similar to the background Flora family but were subdued by some unknown darkening material. The mineralogy of Baptistina suggested that they were similar to LL chondrites just like the Floras. We also looked for OH/H2O absorption bands in Baptistina asteroid family and found none. Our rationale there was if some of them were mixtures of LL chondrite material and carbonaceous then they could show such a feature. We see these OH/H2O bands in some of the carbonaceous meteorites under the right laboratory conditions on Earth. We found no such evidence and so ruled out the possibility of the darkening agent being a carbonaceous impactor like we see on Vesta. There is no evidence from LL chondrites for widespread carbonaceous xenoliths like we see in howardites. So there is also not much suppo rt from the meteoritical side. Shock darkening and impact melt that we see on Chelyabinsk seems to be the most logical way to explain the spectral properties observed on Baptistina family. The take away message would be that if BAF is the source of the K/T impactor then K/T impactor is not carbonaceous contrary to what Kyte reports. A more logical conclusion would be that Baptistina Asteroid Family had nothing to do with the K/T impactor in the first place and the compositional link between the K/T impactor and BAF asteroids is not valid in light of what we see in Chelyabinsk. So the original hypothesis that K/T impactor might be carbonaceous remains. I hope that clears the air. Regards Vishnu Reddy On Jul 16, 2014, at 3:23 PM, Galactic Stone & Ironworks via Meteorite-list wrote: > This is an interesting theory. But, how does Chelyabinsk completely > rule out a carbonaceous KT impactor? Until we recover an extant > sample of the KT impactor, the question is still unanswered. Yes, > there are dark meteorites that are not carbon-rich. But how does this > fact rule out a carbonaceous (or any) impactor for the KT impact? Am > I missing something? > > Best regards, > > MikeG > > -- > - > Web - http://www.galactic-stone.com > Facebook - http://www.facebook.com/galacticstone > Twitter - http://twitter.com/galacticstone > Pinterest - http://pinterest.com/galacticstone > - > > > On 7/16/14, Ron Baalke via Meteorite-list > wrote: >> >> >> NEWS RELEASE FROM THE PLANETARY SCIENCE INSTITUTE >> >> FROM: >> Alan Fischer >> Public Information Officer >> Planetary Science Institute >> 520-382-0411 >> 520-622-6300 >> fisc...@psi.edu >> >> Russian Meteorite Sheds Light on Dinosaur Extinction Mystery >> >> July 16, 2014, Tucson, Ariz. -- A long-standing debate about the source of >> the asteroid that impacted the Earth and caused the extinction of the >> dinosaurs has been put to rest thanks to the Chelyabinsk meteorite that >> disintegrated over Russia in February 2013, a new paper published in the >> journal Icarus shows. >> >> Astronomers have debated whether the dinosaur killer was linked to the >> breakup of a large asteroid forming the Baptistina Asteroid Family (BAF) >> beyond Mars, some of which ended up on Earth-crossing orbits. The asteroid >> impacting Earth is thought to have been dark and carbonaceous. The BAF >> hypothesis was bolstered by them being dark and with a spectral shape >> similar to carbonaceous meteorites. >> >> Analysis of the Chelyabinsk meteorite shows that shock produced during >> catastrophic disruption of a large asteroid can darken otherwise bright >> silicate material. Shock darkening was first reported by Dan Britt (now at >> the University of Central Florida) in the early 1990s. The Chelyabinsk >> meteorite has both bright unshocked and dark shocked material. However, the >> details of the spectra of the dark Chelyabinsk
Re: [meteorite-list] Chelyabinsk Meteorite Sheds Light on Dinosaur Extinction Mystery
Hi Mike: That is not what the press release says. It is still thought that the KT impactor was carbonaceous. There was also thought, based on being dark and formation age of the BAF (when the parent body was disrupted), that the BAF was the source of the KT impactor. However, there is a better spectral match between the Baptistina Asteroid Family members and the shocked-darkened material seen in the Chelyabinsk meteorites than there is between these members and carbonaceous meteorites. This implies that the BAF members are shock-darkened and not carbonaceous. Larry > This is an interesting theory. But, how does Chelyabinsk completely > rule out a carbonaceous KT impactor? Until we recover an extant > sample of the KT impactor, the question is still unanswered. Yes, > there are dark meteorites that are not carbon-rich. But how does this > fact rule out a carbonaceous (or any) impactor for the KT impact? Am > I missing something? > > Best regards, > > MikeG > > -- > - > Web - http://www.galactic-stone.com > Facebook - http://www.facebook.com/galacticstone > Twitter - http://twitter.com/galacticstone > Pinterest - http://pinterest.com/galacticstone > - > > > On 7/16/14, Ron Baalke via Meteorite-list > wrote: >> >> >> NEWS RELEASE FROM THE PLANETARY SCIENCE INSTITUTE >> >> FROM: >> Alan Fischer >> Public Information Officer >> Planetary Science Institute >> 520-382-0411 >> 520-622-6300 >> fisc...@psi.edu >> >> Russian Meteorite Sheds Light on Dinosaur Extinction Mystery >> >> July 16, 2014, Tucson, Ariz. -- A long-standing debate about the source >> of >> the asteroid that impacted the Earth and caused the extinction of the >> dinosaurs has been put to rest thanks to the Chelyabinsk meteorite that >> disintegrated over Russia in February 2013, a new paper published in the >> journal Icarus shows. >> >> Astronomers have debated whether the dinosaur killer was linked to the >> breakup of a large asteroid forming the Baptistina Asteroid Family (BAF) >> beyond Mars, some of which ended up on Earth-crossing orbits. The >> asteroid >> impacting Earth is thought to have been dark and carbonaceous. The BAF >> hypothesis was bolstered by them being dark and with a spectral shape >> similar to carbonaceous meteorites. >> >> Analysis of the Chelyabinsk meteorite shows that shock produced during >> catastrophic disruption of a large asteroid can darken otherwise bright >> silicate material. Shock darkening was first reported by Dan Britt (now >> at >> the University of Central Florida) in the early 1990s. The Chelyabinsk >> meteorite has both bright unshocked and dark shocked material. However, >> the >> details of the spectra of the dark Chelyabinsk material closely >> reproduces >> spectral signatures seen with members of the Baptistina Asteroid Family, >> said Planetary Science Institute Research Scientist Vishnu Reddy, lead >> author of "Chelyabinsk meteorite explains unusual spectral properties >> of >> Baptistina Asteroid Family that appears in Icarus. >> >> "Shock and impact melt can make bright asteroids dark, Reddy said. "In >> other words, not all dark asteroids are rich in carbon as once thought." >> The latest measurements rule out the possibility for the Baptistina >> family >> being the source of the K/T impactor, he added. >> >> 'The link between the K/T impacator, thought to be carbonaceous, and >> BAF, >> has been proved invalid," Reddy said. >> >> Chelyabinsk provided a great opportunity to see the mixture of shocked >> and >> unshocked material in a single meteorite, Reddy said while cautioning >> that >> no clear evidence exists that the Russian meteorite itself came from the >> Baptistina family. >> >> "The new finding has implications for hazards from Near-Earth Objects >> and >> for mining asteroids for space-based resources," Reddy said. "A >> potential >> target identified as primitive and rich in volatiles/organics and carbon >> based on its spectral colors could in fact be just shocked material with >> entirely different composition." >> >> PSI researchers David P. O'Brien and Lucille Le Corre were among the >> co-authors on the paper. >> >> This research work was supported by grants from NASA's Planetary Mission >> Data Analysis Program, NEOO Program and Planetary Geology and Geophysics >> Program. >> >> >> CONTACT: >> Vishnu Reddy >> Senior Scientist >> 808-342-8932 >> re...@psi.edu >> >> PSI INFORMATION: >> Mark V. Sykes >> Director >> 520-622-6300 >> sy...@psi.edu >> >> >> __ >> >> Visit the Archives at http://www.meteorite-list-archives.com >> Meteorite-list mailing list >> Meteorite-list@meteoritecentral.com >> http://three.pairlist.net/mailman/listinfo/meteorite-list >> > __ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Met
Re: [meteorite-list] Chelyabinsk Meteorite Sheds Light on Dinosaur Extinction Mystery
This is an interesting theory. But, how does Chelyabinsk completely rule out a carbonaceous KT impactor? Until we recover an extant sample of the KT impactor, the question is still unanswered. Yes, there are dark meteorites that are not carbon-rich. But how does this fact rule out a carbonaceous (or any) impactor for the KT impact? Am I missing something? Best regards, MikeG -- - Web - http://www.galactic-stone.com Facebook - http://www.facebook.com/galacticstone Twitter - http://twitter.com/galacticstone Pinterest - http://pinterest.com/galacticstone - On 7/16/14, Ron Baalke via Meteorite-list wrote: > > > NEWS RELEASE FROM THE PLANETARY SCIENCE INSTITUTE > > FROM: > Alan Fischer > Public Information Officer > Planetary Science Institute > 520-382-0411 > 520-622-6300 > fisc...@psi.edu > > Russian Meteorite Sheds Light on Dinosaur Extinction Mystery > > July 16, 2014, Tucson, Ariz. -- A long-standing debate about the source of > the asteroid that impacted the Earth and caused the extinction of the > dinosaurs has been put to rest thanks to the Chelyabinsk meteorite that > disintegrated over Russia in February 2013, a new paper published in the > journal Icarus shows. > > Astronomers have debated whether the dinosaur killer was linked to the > breakup of a large asteroid forming the Baptistina Asteroid Family (BAF) > beyond Mars, some of which ended up on Earth-crossing orbits. The asteroid > impacting Earth is thought to have been dark and carbonaceous. The BAF > hypothesis was bolstered by them being dark and with a spectral shape > similar to carbonaceous meteorites. > > Analysis of the Chelyabinsk meteorite shows that shock produced during > catastrophic disruption of a large asteroid can darken otherwise bright > silicate material. Shock darkening was first reported by Dan Britt (now at > the University of Central Florida) in the early 1990s. The Chelyabinsk > meteorite has both bright unshocked and dark shocked material. However, the > details of the spectra of the dark Chelyabinsk material closely reproduces > spectral signatures seen with members of the Baptistina Asteroid Family, > said Planetary Science Institute Research Scientist Vishnu Reddy, lead > author of "Chelyabinsk meteorite explains unusual spectral properties of > Baptistina Asteroid Family that appears in Icarus. > > "Shock and impact melt can make bright asteroids dark, Reddy said. "In > other words, not all dark asteroids are rich in carbon as once thought." > The latest measurements rule out the possibility for the Baptistina family > being the source of the K/T impactor, he added. > > 'The link between the K/T impacator, thought to be carbonaceous, and BAF, > has been proved invalid," Reddy said. > > Chelyabinsk provided a great opportunity to see the mixture of shocked and > unshocked material in a single meteorite, Reddy said while cautioning that > no clear evidence exists that the Russian meteorite itself came from the > Baptistina family. > > "The new finding has implications for hazards from Near-Earth Objects and > for mining asteroids for space-based resources," Reddy said. "A potential > target identified as primitive and rich in volatiles/organics and carbon > based on its spectral colors could in fact be just shocked material with > entirely different composition." > > PSI researchers David P. O'Brien and Lucille Le Corre were among the > co-authors on the paper. > > This research work was supported by grants from NASA's Planetary Mission > Data Analysis Program, NEOO Program and Planetary Geology and Geophysics > Program. > > > CONTACT: > Vishnu Reddy > Senior Scientist > 808-342-8932 > re...@psi.edu > > PSI INFORMATION: > Mark V. Sykes > Director > 520-622-6300 > sy...@psi.edu > > > __ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://three.pairlist.net/mailman/listinfo/meteorite-list > __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] MRO HiRISE Images: July 16, 2014
MARS RECONNAISSANCE ORBITER HIRISE IMAGES July 16, 2014 o Ridges in Eridania Basin http://hirise.lpl.arizona.edu/ESP_036654_1490 Eridania Basin has mounting geomorphic and spectral evidence that it may have been the site of an ancient inland sea. o The Icy Surface of the North Polar Cap http://hirise.lpl.arizona.edu/ESP_036867_2655 At Mars' North Pole is a dome of icy layers ranging up to 2 kilometers thick, roughly analogous to the Earth's ice caps in Greenland or Antarctica. o Ancient Lake Sediments in a Crater http://hirise.lpl.arizona.edu/ESP_037122_2165 Our observation shows layered deposits, some with polygonal patterns, as might be expected from lake sediments. All of the HiRISE images are archived here: http://hirise.lpl.arizona.edu/ Information about the Mars Reconnaissance Orbiter is online at http://www.nasa.gov/mro. The mission is managed by NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology, for the NASA Science Mission Directorate, Washington, D.C. Lockheed Martin Space Systems, of Denver, is the prime contractor and built the spacecraft. HiRISE is operated by the University of Arizona. Ball Aerospace and Technologies Corp., of Boulder, Colo., built the HiRISE instrument. __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Chelyabinsk Meteorite Sheds Light on Dinosaur Extinction Mystery
NEWS RELEASE FROM THE PLANETARY SCIENCE INSTITUTE FROM: Alan Fischer Public Information Officer Planetary Science Institute 520-382-0411 520-622-6300 fisc...@psi.edu Russian Meteorite Sheds Light on Dinosaur Extinction Mystery July 16, 2014, Tucson, Ariz. -- A long-standing debate about the source of the asteroid that impacted the Earth and caused the extinction of the dinosaurs has been put to rest thanks to the Chelyabinsk meteorite that disintegrated over Russia in February 2013, a new paper published in the journal Icarus shows. Astronomers have debated whether the dinosaur killer was linked to the breakup of a large asteroid forming the Baptistina Asteroid Family (BAF) beyond Mars, some of which ended up on Earth-crossing orbits. The asteroid impacting Earth is thought to have been dark and carbonaceous. The BAF hypothesis was bolstered by them being dark and with a spectral shape similar to carbonaceous meteorites. Analysis of the Chelyabinsk meteorite shows that shock produced during catastrophic disruption of a large asteroid can darken otherwise bright silicate material. Shock darkening was first reported by Dan Britt (now at the University of Central Florida) in the early 1990s. The Chelyabinsk meteorite has both bright unshocked and dark shocked material. However, the details of the spectra of the dark Chelyabinsk material closely reproduces spectral signatures seen with members of the Baptistina Asteroid Family, said Planetary Science Institute Research Scientist Vishnu Reddy, lead author of "Chelyabinsk meteorite explains unusual spectral properties of Baptistina Asteroid Family that appears in Icarus. "Shock and impact melt can make bright asteroids dark, Reddy said. "In other words, not all dark asteroids are rich in carbon as once thought." The latest measurements rule out the possibility for the Baptistina family being the source of the K/T impactor, he added. 'The link between the K/T impacator, thought to be carbonaceous, and BAF, has been proved invalid," Reddy said. Chelyabinsk provided a great opportunity to see the mixture of shocked and unshocked material in a single meteorite, Reddy said while cautioning that no clear evidence exists that the Russian meteorite itself came from the Baptistina family. "The new finding has implications for hazards from Near-Earth Objects and for mining asteroids for space-based resources," Reddy said. "A potential target identified as primitive and rich in volatiles/organics and carbon based on its spectral colors could in fact be just shocked material with entirely different composition." PSI researchers David P. O'Brien and Lucille Le Corre were among the co-authors on the paper. This research work was supported by grants from NASA's Planetary Mission Data Analysis Program, NEOO Program and Planetary Geology and Geophysics Program. CONTACT: Vishnu Reddy Senior Scientist 808-342-8932 re...@psi.edu PSI INFORMATION: Mark V. Sykes Director 520-622-6300 sy...@psi.edu __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Curiosity Rover's Images Show Laser Flash on Martian Rock
http://www.jpl.nasa.gov/news/news.php?release=2014-232 NASA Rover's Images Show Laser Flash on Martian Rock Jet Propulsion Laboratory July 16, 2014 Flashes appear on a baseball-size Martian rock in a series of images taken Saturday, July 12 by the Mars Hand Lens Imager (MAHLI) camera on the arm of NASA's Curiosity Mars Rover. The flashes occurred while the rover's Chemistry and Camera (ChemCam) instrument fired multiple laser shots to investigate the rock's composition. The images, strung together as a video, are available online at: http://www.jpl.nasa.gov/video/?id=1317 ChemCam's laser has zapped more than 600 rock and soil targets on Mars since Curiosity landed in the planet's Gale Crater in August 2012. "This is so exciting! The ChemCam laser has fired more than 150,000 times on Mars, but this is the first time we see the plasma plume that is created," said ChemCam Deputy Principal Investigator Sylvestre Maurice, at the Research Institute in Astrophysics and Planetology, of France's National Center for Scientific Research and the University of Toulouse, France. "Each time the laser hits a target, the plasma light is caught and analyzed by ChemCam's spectrometers. What the new images add is confirmation that the size and shape of the spark are what we anticipated under Martian conditions." Preliminary analysis of the ChemCam spectra from this target rock, appropriately named "Nova," indicates a composition rich in silicon, aluminum and sodium, beneath a dust layer poor in those elements. This is typical of rocks that Curiosity is encountering on its way toward Mount Sharp. MAHLI Deputy Principal Investigator Aileen Yingst of the Planetary Science Institute, Tucson, Arizona, said, "One of the reasons we took these images is that they allow the ChemCam folks to compare the plume to those they imaged on Earth. Also, MAHLI has captured images of other activities of Curiosity, for documentation purposes, and this was an opportunity to document the laser in action." Malin Space Science Systems, San Diego, developed, built and operates MAHLI. The U.S. Department of Energy's Los Alamos National Laboratory, in Los Alamos, New Mexico, developed ChemCam in partnership with scientists and engineers funded by the French national space agency (CNES), the University of Toulouse and France's National Center for Scientific Research. NASA's Mars Science Laboratory Project is using Curiosity to assess ancient habitable environments and major changes in Martian environmental conditions. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology, Pasadena, built the rover and manages the project for NASA's Science Mission Directorate in Washington. For more information about Curiosity, visit these sites: http://www.jpl.nasa.gov/msl , http://www.nasa.gov/msl and http://mars.jpl.nasa.gov/msl/ You can follow the mission on Facebook at: http://www.facebook.com/marscuriosity and on Twitter at: http://www.twitter.com/marscuriosity Guy Webster Jet Propulsion Laboratory, Pasadena, Calif. 818-354-6278 guy.webs...@jpl.nasa.gov 2014-232 __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] New Horizons Marks a 'Year Out' with a Successful Course Correction
http://pluto.jhuapl.edu/news_center/news/20140715.php New Horizons Marks a 'Year Out' with a Successful Course Correction July 15, 2014 New Horizons performed a slight course correction yesterday, a short maneuver designed to correct the spacecraft's arrival time - a year from now - at the precisely intended aim point at Pluto. The maneuver - during which New Horizons fired its thrusters for just under 88 seconds - sped the craft up by about 2.4 miles per hour and keeps it on track for a flight past Pluto that culminates /next/ July 14. "If we hadn't performed this maneuver, we would have arrived at Pluto about 36 minutes later than we wanted to," said Mark Holdridge, New Horizons encounter mission manager at the Johns Hopkins Applied Physics Laboratory (APL) in Laurel, Md. "Making the adjustment now means we won't have to perform a bigger maneuver - and use more of the spacecraft's fuel - down the road." While the maneuver itself happened onboard the spacecraft at 10:45 p.m. EDT on July 14, data indicating that the burn went as planned arrived in the New Horizons Mission Operations Center at APL at 4:30 a.m. EDT on July 15 - after traveling nearly four hours from the spacecraft, which is nearly 2.7 billion miles from home, through NASA's Deep Space Network. "It was a great burn, performed flawlessly" said Alan Stern, New Horizons principal investigator from Southwest Research Institute, Boulder, Colo. "You could say that New Horizons just lit a little candle for its one year out anniversary." It was the spacecraft's sixth course correction maneuver since launch in January 2006, and the first since 2010. New Horizons mission design team lead Yanping Guo, from APL, noted that the maneuver marked the first change in the Pluto encounter trajectory since 2008, now that the team has better information on the predicted locations of Pluto and its largest moon, Charon. "That information is critical to making sure the sequence of science observations, which will be programmed into New Horizons' computers, goes exactly as planned," Guo said. Holdridge added that New Horizons will take images of the Pluto system as it approaches Pluto, beginning early next year, and navigation and flight dynamics experts will them to design additional maneuvers to further refine the spacecraft's course. Did you know? The first commands to perform the thruster burn were transmitted to the spacecraft on July 11, and adjusted slightly on July 14. The 87.52-second burn, which sped New Horizons up by 1.08 meters per second (about 2.4 miles per hour), used about a quarter of a kilogram of fuel ? less than one-half of a percent of the approximately 53 kilograms still onboard the spacecraft. __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Comet Shoemake-Levy 9 20th Anniversary
Twenty years ago today, the first fragment of Comet Shoemaker-Levy 9 (SL9) impacted Jupiter. The remaining 20 fragments of the comet proceeded to hit Jupiter over the following 6 days. I had created a Comet SL9 website in June 1994, and ended up posting over 1,000 impact images to the site. Back then, websites were relatively unknown and somewhat of a novelty. The Comet Shoemaker-Levy 9 impacts became the first big Web event, and was key in raising the awareness of websites to the mainstream public, which we now take for granted today. My Comet Shoemaker-Levy 9 website is still around. http://www2.jpl.nasa.gov/sl9 Ron Baalke __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] New crater in Siberia?
I recognize that regional/localized warming could account for it, but that's not what they wrote. They should have phrased their hypothesis better. Michael in so. Cal. On Wed, Jul 16, 2014 at 9:32 AM, Yinan Wang wrote: > Don't dismiss something just because it uses the phrase "Global > Warming." In this case all it takes is regional warming in the arctic > circle to release methane previously frozen in the permafrost, which > can ignite underground and explode. > > > > On Wed, Jul 16, 2014 at 12:17 PM, Michael Mulgrew via Meteorite-list > wrote: >> Their "most plausible theory" involves global warming? Global warming >> isn't even a plausible theory any more, ask a climatologist. >> >> This article acknowleges that it is not a meteorite crater, which is >> apparent from the pictures: >> http://www.dailymail.co.uk/travel/travel_news/article-2693105/Giant-hole-appears-Siberia-Huge-crater-emerges-end-world.html >> >> "A spokesman for the ministry's Yamal branch has ruled out a >> meteorite, but says it is too early to say what caused the hole. >> >> 'We can definitely say that it is not a meteorite,' he says." >> >> Michael in so. Cal. >> >> On Wed, Jul 16, 2014 at 9:03 AM, Michael Farmer via Meteorite-list >> wrote: >>> This is not a meteorite crater, unless you think meteorites drill holes >>> hundreds of feet deep. >>> >>> Michael Farmer >>> >>> Sent from my iPad >>> On Jul 16, 2014, at 9:01 AM, Chauncey Walden via Meteorite-list wrote: http://www.telegraph.co.uk/news/newsvideo/10970468/Mysterious-giant-hole-appears-in-Siberia.html Chauncey __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list >>> __ >>> >>> Visit the Archives at http://www.meteorite-list-archives.com >>> Meteorite-list mailing list >>> Meteorite-list@meteoritecentral.com >>> http://three.pairlist.net/mailman/listinfo/meteorite-list >> __ >> >> Visit the Archives at http://www.meteorite-list-archives.com >> Meteorite-list mailing list >> Meteorite-list@meteoritecentral.com >> http://three.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] New crater in Siberia?
Don't dismiss something just because it uses the phrase "Global Warming." In this case all it takes is regional warming in the arctic circle to release methane previously frozen in the permafrost, which can ignite underground and explode. On Wed, Jul 16, 2014 at 12:17 PM, Michael Mulgrew via Meteorite-list wrote: > Their "most plausible theory" involves global warming? Global warming > isn't even a plausible theory any more, ask a climatologist. > > This article acknowleges that it is not a meteorite crater, which is > apparent from the pictures: > http://www.dailymail.co.uk/travel/travel_news/article-2693105/Giant-hole-appears-Siberia-Huge-crater-emerges-end-world.html > > "A spokesman for the ministry's Yamal branch has ruled out a > meteorite, but says it is too early to say what caused the hole. > > 'We can definitely say that it is not a meteorite,' he says." > > Michael in so. Cal. > > On Wed, Jul 16, 2014 at 9:03 AM, Michael Farmer via Meteorite-list > wrote: >> This is not a meteorite crater, unless you think meteorites drill holes >> hundreds of feet deep. >> >> Michael Farmer >> >> Sent from my iPad >> >>> On Jul 16, 2014, at 9:01 AM, Chauncey Walden via Meteorite-list >>> wrote: >>> >>> http://www.telegraph.co.uk/news/newsvideo/10970468/Mysterious-giant-hole-appears-in-Siberia.html >>> Chauncey >>> __ >>> >>> Visit the Archives at http://www.meteorite-list-archives.com >>> Meteorite-list mailing list >>> Meteorite-list@meteoritecentral.com >>> http://three.pairlist.net/mailman/listinfo/meteorite-list >> __ >> >> Visit the Archives at http://www.meteorite-list-archives.com >> Meteorite-list mailing list >> Meteorite-list@meteoritecentral.com >> http://three.pairlist.net/mailman/listinfo/meteorite-list > __ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://three.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] New crater in Siberia?
Their "most plausible theory" involves global warming? Global warming isn't even a plausible theory any more, ask a climatologist. This article acknowleges that it is not a meteorite crater, which is apparent from the pictures: http://www.dailymail.co.uk/travel/travel_news/article-2693105/Giant-hole-appears-Siberia-Huge-crater-emerges-end-world.html "A spokesman for the ministry's Yamal branch has ruled out a meteorite, but says it is too early to say what caused the hole. 'We can definitely say that it is not a meteorite,' he says." Michael in so. Cal. On Wed, Jul 16, 2014 at 9:03 AM, Michael Farmer via Meteorite-list wrote: > This is not a meteorite crater, unless you think meteorites drill holes > hundreds of feet deep. > > Michael Farmer > > Sent from my iPad > >> On Jul 16, 2014, at 9:01 AM, Chauncey Walden via Meteorite-list >> wrote: >> >> http://www.telegraph.co.uk/news/newsvideo/10970468/Mysterious-giant-hole-appears-in-Siberia.html >> Chauncey >> __ >> >> Visit the Archives at http://www.meteorite-list-archives.com >> Meteorite-list mailing list >> Meteorite-list@meteoritecentral.com >> http://three.pairlist.net/mailman/listinfo/meteorite-list > __ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://three.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] New crater in Siberia?
Looks like the result of a methane-trap explosion! On Wed, Jul 16, 2014 at 12:01 PM, Chauncey Walden via Meteorite-list wrote: > http://www.telegraph.co.uk/news/newsvideo/10970468/Mysterious-giant-hole-appears-in-Siberia.html > Chauncey > __ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://three.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] New crater in Siberia?
This is not a meteorite crater, unless you think meteorites drill holes hundreds of feet deep. Michael Farmer Sent from my iPad > On Jul 16, 2014, at 9:01 AM, Chauncey Walden via Meteorite-list > wrote: > > http://www.telegraph.co.uk/news/newsvideo/10970468/Mysterious-giant-hole-appears-in-Siberia.html > Chauncey > __ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://three.pairlist.net/mailman/listinfo/meteorite-list __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] New crater in Siberia?
http://www.telegraph.co.uk/news/newsvideo/10970468/Mysterious-giant-hole-appears-in-Siberia.html Chauncey __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] Meteorite Picture of the Day
Today's Meteorite Picture of the Day: Ybbsitz Contributed by: Paul Swartz http://www.tucsonmeteorites.com/mpodmain.asp __ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://three.pairlist.net/mailman/listinfo/meteorite-list
