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  • 1
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    Asteroidal water within fluid inclusion-bearing halite in an H5 chondrite, Monahans (1998) (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-08-28
    Description: Crystals of halite and sylvite within the Monahans (1998) H5 chondrite contain aqueous fluid inclusions. The fluids are dominantly sodium chloride-potassium chloride brines, but they also contain divalent cations such as iron, magnesium, or calcium. Two possible origins for the brines are indigenous fluids flowing within the asteroid and exogenous fluids delivered into the asteroid surface from a salt-containing icy object.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zolensky, M E -- Bodnar, R J -- Gibson, E K Jr -- Nyquist, L E -- Reese, Y -- Shih, C Y -- Wiesmann, H -- New York, N.Y. -- Science. 1999 Aug 27;285(5432):1377-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Mail Code SN2, NASA Johnson Space Center, Houston, TX 77058, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10464091" target="_blank"〉PubMed〈/a〉
    Keywords: Crystallization ; Mass Spectrometry ; *Meteoroids ; *Minor Planets ; Potassium Chloride ; *Sodium Chloride ; Spectrum Analysis, Raman ; Temperature ; Texas ; *Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    The fall, recovery, orbit, and composition of the Tagish Lake meteorite: a new type of carbonaceous chondrite (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-10-13
    Description: The preatmospheric mass of the Tagish Lake meteoroid was about 200,000 kilograms. Its calculated orbit indicates affinity to the Apollo asteroids with a semimajor axis in the middle of the asteroid belt, consistent with a linkage to low-albedo C, D, and P type asteroids. The mineralogy, oxygen isotope, and bulk chemical composition of recovered samples of the Tagish Lake meteorite are intermediate between CM and CI meteorites. These data suggest that the Tagish Lake meteorite may be one of the most primitive solar system materials yet studied.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brown, P G -- Hildebrand, A R -- Zolensky, M E -- Grady, M -- Clayton, R N -- Mayeda, T K -- Tagliaferri, E -- Spalding, R -- MacRae, N D -- Hoffman, E L -- Mittlefehldt, D W -- Wacker, J F -- Bird, J A -- Campbell, M D -- Carpenter, R -- Gingerich, H -- Glatiotis, M -- Greiner, E -- Mazur, M J -- McCausland, P J -- Plotkin, H -- Rubak Mazur, T -- New York, N.Y. -- Science. 2000 Oct 13;290(5490):320-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics and Astronomy, University of Western Ontario, London, Ontario N6A 3K7, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11030647" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 3
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    The Tagish Lake meteorite: a possible sample from a D-type asteroid (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-08-25
    Description: A new type of carbonaceous chondrite, the Tagish Lake meteorite, exhibits a reflectance spectrum similar to spectra observed from the D-type asteroids, which are relatively abundant in the outer solar system beyond the main asteroid belt and have been inferred to be more primitive than any known meteorite. Until the Tagish Lake fall, these asteroids had no analog in the meteorite collections. The Tagish Lake meteorite is a carbon-rich (4 to 5 weight %), aqueously altered carbonaceous chondrite and contains high concentrations of presolar grains and carbonate minerals, which is consistent with the expectation that the D-type asteroids were originally made of primitive materials and did not experience any extensive heating.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hiroi, T -- Zolensky, M E -- Pieters, C M -- New York, N.Y. -- Science. 2001 Sep 21;293(5538):2234-6. Epub 2001 Aug 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geological Sciences, Brown University, Providence, RI 02912, USA. takahiro_hiroi@brown.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11520950" target="_blank"〉PubMed〈/a〉
    Keywords: Canada ; Carbon/analysis ; Carbonates/analysis ; *Meteoroids ; *Minor Planets ; Spectrum Analysis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    The impact and recovery of asteroid 2008 TC(3) (2009)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2009-03-28
    Description: In the absence of a firm link between individual meteorites and their asteroidal parent bodies, asteroids are typically characterized only by their light reflection properties, and grouped accordingly into classes. On 6 October 2008, a small asteroid was discovered with a flat reflectance spectrum in the 554-995 nm wavelength range, and designated 2008 TC(3) (refs 4-6). It subsequently hit the Earth. Because it exploded at 37 km altitude, no macroscopic fragments were expected to survive. Here we report that a dedicated search along the approach trajectory recovered 47 meteorites, fragments of a single body named Almahata Sitta, with a total mass of 3.95 kg. Analysis of one of these meteorites shows it to be an achondrite, a polymict ureilite, anomalous in its class: ultra-fine-grained and porous, with large carbonaceous grains. The combined asteroid and meteorite reflectance spectra identify the asteroid as F class, now firmly linked to dark carbon-rich anomalous ureilites, a material so fragile it was not previously represented in meteorite collections.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jenniskens, P -- Shaddad, M H -- Numan, D -- Elsir, S -- Kudoda, A M -- Zolensky, M E -- Le, L -- Robinson, G A -- Friedrich, J M -- Rumble, D -- Steele, A -- Chesley, S R -- Fitzsimmons, A -- Duddy, S -- Hsieh, H H -- Ramsay, G -- Brown, P G -- Edwards, W N -- Tagliaferri, E -- Boslough, M B -- Spalding, R E -- Dantowitz, R -- Kozubal, M -- Pravec, P -- Borovicka, J -- Charvat, Z -- Vaubaillon, J -- Kuiper, J -- Albers, J -- Bishop, J L -- Mancinelli, R L -- Sandford, S A -- Milam, S N -- Nuevo, M -- Worden, S P -- England -- Nature. 2009 Mar 26;458(7237):485-8. doi: 10.1038/nature07920.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉SETI Institute, Carl Sagan Center, 515 North Whisman Road, Mountain View, California 94043, USA. Petrus.M.Jenniskens@nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19325630" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 5
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    Organic globules in the Tagish Lake meteorite: remnants of the protosolar disk (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-12-02
    Description: Coordinated transmission electron microscopy and isotopic measurements of organic globules in the Tagish Lake meteorite shows that they have elevated ratios of nitrogen-15 to nitrogen-14 (1.2 to 2 times terrestrial) and of deuterium to hydrogen (2.5 to 9 times terrestrial). These isotopic anomalies are indicative of mass fractionation during chemical reactions at extremely low temperatures (10 to 20 kelvin), characteristic of cold molecular clouds and the outer protosolar disk. The globules probably originated as organic ice coatings on preexisting grains that were photochemically processed into refractory organic matter. The globules resemble cometary carbon, hydrogen, oxygen, and nitrogen (CHON) particles, suggesting that such grains were important constituents of the solar system starting materials.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nakamura-Messenger, Keiko -- Messenger, Scott -- Keller, Lindsay P -- Clemett, Simon J -- Zolensky, Michael E -- New York, N.Y. -- Science. 2006 Dec 1;314(5804):1439-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Robert M. Walker Laboratory for Space Science, Astromaterials Research and Exploration Science Directorate, NASA Johnson Space Center, Houston, TX 77058, USA. keiko.nakamura-1@nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17138898" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon/*analysis ; Carbon Isotopes/analysis ; Deuterium/analysis ; Hydrogen/*analysis ; Ice ; *Meteoroids ; Nitrogen/*analysis ; Nitrogen Isotopes/analysis ; Oxygen/analysis ; Temperature ; Ultraviolet Rays
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 6
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    Organics captured from comet 81P/Wild 2 by the Stardust spacecraft (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-12-16
    Description: Organics found in comet 81P/Wild 2 samples show a heterogeneous and unequilibrated distribution in abundance and composition. Some organics are similar, but not identical, to those in interplanetary dust particles and carbonaceous meteorites. A class of aromatic-poor organic material is also present. The organics are rich in oxygen and nitrogen compared with meteoritic organics. Aromatic compounds are present, but the samples tend to be relatively poorer in aromatics than are meteorites and interplanetary dust particles. The presence of deuterium and nitrogen-15 excesses suggest that some organics have an interstellar/protostellar heritage. Although the variable extent of modification of these materials by impact capture is not yet fully constrained, a diverse suite of organic compounds is present and identifiable within the returned samples.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sandford, Scott A -- Aleon, Jerome -- Alexander, Conel M O'd -- Araki, Tohru -- Bajt, Sasa -- Baratta, Giuseppe A -- Borg, Janet -- Bradley, John P -- Brownlee, Donald E -- Brucato, John R -- Burchell, Mark J -- Busemann, Henner -- Butterworth, Anna -- Clemett, Simon J -- Cody, George -- Colangeli, Luigi -- Cooper, George -- D'Hendecourt, Louis -- Djouadi, Zahia -- Dworkin, Jason P -- Ferrini, Gianluca -- Fleckenstein, Holger -- Flynn, George J -- Franchi, Ian A -- Fries, Marc -- Gilles, Mary K -- Glavin, Daniel P -- Gounelle, Matthieu -- Grossemy, Faustine -- Jacobsen, Chris -- Keller, Lindsay P -- Kilcoyne, A L David -- Leitner, Jan -- Matrajt, Graciela -- Meibom, Anders -- Mennella, Vito -- Mostefaoui, Smail -- Nittler, Larry R -- Palumbo, Maria E -- Papanastassiou, Dimitri A -- Robert, Francois -- Rotundi, Alessandra -- Snead, Christopher J -- Spencer, Maegan K -- Stadermann, Frank J -- Steele, Andrew -- Stephan, Thomas -- Tsou, Peter -- Tyliszczak, Tolek -- Westphal, Andrew J -- Wirick, Sue -- Wopenka, Brigitte -- Yabuta, Hikaru -- Zare, Richard N -- Zolensky, Michael E -- New York, N.Y. -- Science. 2006 Dec 15;314(5806):1720-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Astrophysics Branch, NASA-Ames Research Center, Moffett Field, CA 94035, USA. ssandford@mail.arc.nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17170291" target="_blank"〉PubMed〈/a〉
    Keywords: Carbon/analysis ; Cosmic Dust/analysis ; Deuterium/analysis ; *Meteoroids ; Nitrogen/analysis ; Nitrogen Isotopes/analysis ; Organic Chemicals/*analysis ; Oxygen/analysis ; Polycyclic Hydrocarbons, Aromatic/analysis ; Spacecraft
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 7
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    Mineralogy and petrology of comet 81P/Wild 2 nucleus samples (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-12-16
    Description: The bulk of the comet 81P/Wild 2 (hereafter Wild 2) samples returned to Earth by the Stardust spacecraft appear to be weakly constructed mixtures of nanometer-scale grains, with occasional much larger (over 1 micrometer) ferromagnesian silicates, Fe-Ni sulfides, Fe-Ni metal, and accessory phases. The very wide range of olivine and low-Ca pyroxene compositions in comet Wild 2 requires a wide range of formation conditions, probably reflecting very different formation locations in the protoplanetary disk. The restricted compositional ranges of Fe-Ni sulfides, the wide range for silicates, and the absence of hydrous phases indicate that comet Wild 2 experienced little or no aqueous alteration. Less abundant Wild 2 materials include a refractory particle, whose presence appears to require radial transport in the early protoplanetary disk.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zolensky, Michael E -- Zega, Thomas J -- Yano, Hajime -- Wirick, Sue -- Westphal, Andrew J -- Weisberg, Mike K -- Weber, Iris -- Warren, Jack L -- Velbel, Michael A -- Tsuchiyama, Akira -- Tsou, Peter -- Toppani, Alice -- Tomioka, Naotaka -- Tomeoka, Kazushige -- Teslich, Nick -- Taheri, Mitra -- Susini, Jean -- Stroud, Rhonda -- Stephan, Thomas -- Stadermann, Frank J -- Snead, Christopher J -- Simon, Steven B -- Simionovici, Alexandre -- See, Thomas H -- Robert, Francois -- Rietmeijer, Frans J M -- Rao, William -- Perronnet, Murielle C -- Papanastassiou, Dimitri A -- Okudaira, Kyoko -- Ohsumi, Kazumasa -- Ohnishi, Ichiro -- Nakamura-Messenger, Keiko -- Nakamura, Tomoki -- Mostefaoui, Smail -- Mikouchi, Takashi -- Meibom, Anders -- Matrajt, Graciela -- Marcus, Matthew A -- Leroux, Hugues -- Lemelle, Laurence -- Le, Loan -- Lanzirotti, Antonio -- Langenhorst, Falko -- Krot, Alexander N -- Keller, Lindsay P -- Kearsley, Anton T -- Joswiak, David -- Jacob, Damien -- Ishii, Hope -- Harvey, Ralph -- Hagiya, Kenji -- Grossman, Lawrence -- Grossman, Jeffrey N -- Graham, Giles A -- Gounelle, Matthieu -- Gillet, Philippe -- Genge, Matthew J -- Flynn, George -- Ferroir, Tristan -- Fallon, Stewart -- Fakra, Sirine -- Ebel, Denton S -- Dai, Zu Rong -- Cordier, Patrick -- Clark, Benton -- Chi, Miaofang -- Butterworth, Anna L -- Brownlee, Donald E -- Bridges, John C -- Brennan, Sean -- Brearley, Adrian -- Bradley, John P -- Bleuet, Pierre -- Bland, Phil A -- Bastien, Ron -- New York, N.Y. -- Science. 2006 Dec 15;314(5806):1735-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, TX 77058, USA. michael.e.zolensky@nasa.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17170295" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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  • 8
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    Elemental compositions of comet 81P/Wild 2 samples collected by Stardust (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-12-16
    Description: We measured the elemental compositions of material from 23 particles in aerogel and from residue in seven craters in aluminum foil that was collected during passage of the Stardust spacecraft through the coma of comet 81P/Wild 2. These particles are chemically heterogeneous at the largest size scale analyzed ( approximately 180 ng). The mean elemental composition of this Wild 2 material is consistent with the CI meteorite composition, which is thought to represent the bulk composition of the solar system, for the elements Mg, Si, Mn, Fe, and Ni to 35%, and for Ca and Ti to 60%. The elements Cu, Zn, and Ga appear enriched in this Wild 2 material, which suggests that the CI meteorites may not represent the solar system composition for these moderately volatile minor elements.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Flynn, George J -- Bleuet, Pierre -- Borg, Janet -- Bradley, John P -- Brenker, Frank E -- Brennan, Sean -- Bridges, John -- Brownlee, Don E -- Bullock, Emma S -- Burghammer, Manfred -- Clark, Benton C -- Dai, Zu Rong -- Daghlian, Charles P -- Djouadi, Zahia -- Fakra, Sirine -- Ferroir, Tristan -- Floss, Christine -- Franchi, Ian A -- Gainsforth, Zack -- Gallien, Jean-Paul -- Gillet, Philippe -- Grant, Patrick G -- Graham, Giles A -- Green, Simon F -- Grossemy, Faustine -- Heck, Philipp R -- Herzog, Gregory F -- Hoppe, Peter -- Horz, Friedrich -- Huth, Joachim -- Ignatyev, Konstantin -- Ishii, Hope A -- Janssens, Koen -- Joswiak, David -- Kearsley, Anton T -- Khodja, Hicham -- Lanzirotti, Antonio -- Leitner, Jan -- Lemelle, Laurence -- Leroux, Hugues -- Luening, Katharina -- Macpherson, Glenn J -- Marhas, Kuljeet K -- Marcus, Matthew A -- Matrajt, Graciela -- Nakamura, Tomoki -- Nakamura-Messenger, Keiko -- Nakano, Tsukasa -- Newville, Matthew -- Papanastassiou, Dimitri A -- Pianetta, Piero -- Rao, William -- Riekel, Christian -- Rietmeijer, Frans J M -- Rost, Detlef -- Schwandt, Craig S -- See, Thomas H -- Sheffield-Parker, Julie -- Simionovici, Alexandre -- Sitnitsky, Ilona -- Snead, Christopher J -- Stadermann, Frank J -- Stephan, Thomas -- Stroud, Rhonda M -- Susini, Jean -- Suzuki, Yoshio -- Sutton, Stephen R -- Taylor, Susan -- Teslich, Nick -- Troadec, D -- Tsou, Peter -- Tsuchiyama, Akira -- Uesugi, Kentaro -- Vekemans, Bart -- Vicenzi, Edward P -- Vincze, Laszlo -- Westphal, Andrew J -- Wozniakiewicz, Penelope -- Zinner, Ernst -- Zolensky, Michael E -- New York, N.Y. -- Science. 2006 Dec 15;314(5806):1731-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, State University of New York at Plattsburgh, 101 Broad Street, Plattsburgh, NY 12901, USA. george.flynn@plattsburgh.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17170294" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
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  • 9
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    Neutron activation analysis of a particle returned from asteroid Itokawa (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-08-27
    Description: A single grain (~3 micrograms) returned by the Hayabusa spacecraft was analyzed by neutron activation analysis. This grain is mainly composed of olivine with minor amounts of plagioclase, troilite, and metal. Our results establish that the Itokawa sample has similar chemical characteristics (iron/scandium and nickel/cobalt ratios) to chondrites, confirming that this grain is extraterrestrial in origin and has primitive chemical compositions. Estimated iridium/nickel and iridium/cobalt ratios for metal in the Itokawa samples are about five times lower than CI carbonaceous chondrite values. A similar depletion of iridium was observed in chondrule metals of ordinary chondrites. These metals must have condensed from the nebular where refractory siderophile elements already condensed and were segregated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ebihara, M -- Sekimoto, S -- Shirai, N -- Hamajima, Y -- Yamamoto, M -- Kumagai, K -- Oura, Y -- Ireland, T R -- Kitajima, F -- Nagao, K -- Nakamura, T -- Naraoka, H -- Noguchi, T -- Okazaki, R -- Tsuchiyama, A -- Uesugi, M -- Yurimoto, H -- Zolensky, M E -- Abe, M -- Fujimura, A -- Mukai, T -- Yada, Y -- New York, N.Y. -- Science. 2011 Aug 26;333(6046):1119-21. doi: 10.1126/science.1207865.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan. ebihara-mitsuru@tmu.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21868669" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
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  • 10
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    Itokawa dust particles: a direct link between S-type asteroids and ordinary chondrites (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-08-27
    Description: The Hayabusa spacecraft successfully recovered dust particles from the surface of near-Earth asteroid 25143 Itokawa. Synchrotron-radiation x-ray diffraction and transmission and scanning electron microscope analyses indicate that the mineralogy and mineral chemistry of the Itokawa dust particles are identical to those of thermally metamorphosed LL chondrites, consistent with spectroscopic observations made from Earth and by the Hayabusa spacecraft. Our results directly demonstrate that ordinary chondrites, the most abundant meteorites found on Earth, come from S-type asteroids. Mineral chemistry indicates that the majority of regolith surface particles suffered long-term thermal annealing and subsequent impact shock, suggesting that Itokawa is an asteroid made of reassembled pieces of the interior portions of a once larger asteroid.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nakamura, Tomoki -- Noguchi, Takaaki -- Tanaka, Masahiko -- Zolensky, Michael E -- Kimura, Makoto -- Tsuchiyama, Akira -- Nakato, Aiko -- Ogami, Toshihiro -- Ishida, Hatsumi -- Uesugi, Masayuki -- Yada, Toru -- Shirai, Kei -- Fujimura, Akio -- Okazaki, Ryuji -- Sandford, Scott A -- Ishibashi, Yukihiro -- Abe, Masanao -- Okada, Tatsuaki -- Ueno, Munetaka -- Mukai, Toshifumi -- Yoshikawa, Makoto -- Kawaguchi, Junichiro -- New York, N.Y. -- Science. 2011 Aug 26;333(6046):1113-6. doi: 10.1126/science.1207758.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Material Sciences, Faculty of Science, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan. tomoki@m.tohoku.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21868667" target="_blank"〉PubMed〈/a〉
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