Mineralogy and Petrology of Comet 81P/Wild 2 Nucleus Samples
Author:
Zolensky Michael E.12345, Zega Thomas J.12345, Yano Hajime12345, Wirick Sue12345, Westphal Andrew J.12345, Weisberg Mike K.12345, Weber Iris12345, Warren Jack L.12345, Velbel Michael A.12345, Tsuchiyama Akira12345, Tsou Peter12345, Toppani Alice12345, Tomioka Naotaka12345, Tomeoka Kazushige12345, Teslich Nick12345, Taheri Mitra12345, Susini Jean12345, Stroud Rhonda12345, Stephan Thomas12345, Stadermann Frank J.12345, Snead Christopher J.12345, Simon Steven B.12345, Simionovici Alexandre12345, See Thomas H.12345, Robert François12345, Rietmeijer Frans J. M.12345, Rao William12345, Perronnet Murielle C.12345, Papanastassiou Dimitri A.12345, Okudaira Kyoko12345, Ohsumi Kazumasa12345, Ohnishi Ichiro12345, Nakamura-Messenger Keiko12345, Nakamura Tomoki12345, Mostefaoui Smail12345, Mikouchi Takashi12345, Meibom Anders12345, Matrajt Graciela12345, Marcus Matthew A.12345, Leroux Hugues12345, Lemelle Laurence12345, Le Loan12345, Lanzirotti Antonio12345, Langenhorst Falko12345, Krot Alexander N.12345, Keller Lindsay P.12345, Kearsley Anton T.12345, Joswiak David12345, Jacob Damien12345, Ishii Hope12345, Harvey Ralph12345, Hagiya Kenji12345, Grossman Lawrence12345, Grossman Jeffrey N.12345, Graham Giles A.12345, Gounelle Matthieu12345, Gillet Philippe12345, Genge Matthew J.12345, Flynn George12345, Ferroir Tristan12345, Fallon Stewart12345, Ebel Denton S.12345, Dai Zu Rong12345, Cordier Patrick12345, Clark Benton12345, Chi Miaofang12345, Butterworth Anna L.12345, Brownlee Donald E.12345, Bridges John C.12345, Brennan Sean12345, Brearley Adrian12345, Bradley John P.12345, Bleuet Pierre12345, Bland Phil A.12345, Bastien Ron12345
Affiliation:
1. Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, TX 77058, USA. 2. Naval Research Laboratory, Code 6360, 4555 Overlook Avenue SW, Washington, DC 20375, USA. 3. JAXA-ISAS, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan. 4. National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973, USA. 5. Space Sciences Laboratory, University of California, 7 Gauss Way, Berkeley, CA 94720–7450, USA.
Abstract
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.
Publisher
American Association for the Advancement of Science (AAAS)
Subject
Multidisciplinary
Reference41 articles.
1. R. A. Barrett, M. E. Zolensky, R. Bernhard, Lunar Planet. Sci.24, 65 (1993). 2. Impact Features and Projectile Residues in Aerogel Exposed on Mir 3. COSMIC DUST COLLECTION IN AEROGEL 4. These issues are treated at greater length in the supporting material on Science Online. 5. Impact Features on Stardust: Implications for Comet 81P/Wild 2 Dust
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