title: Mineralogy and petrology of comet 81P/Wild 2 nucleus samples.
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.
authors.affiliation: Astromaterials Research and Exploration Science, NASA Johnson Space Center, Houston, TX 77058, USA. michael.e.zolensky@nasa.gov
authors.forename: Michael E
authors.initials: ME
authors.lastname: Zolensky
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Zega
authors.forename: Hajime
authors.initials: H
authors.lastname: Yano
authors.forename: Sue
authors.initials: S
authors.lastname: Wirick
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Westphal
authors.forename: Mike K
authors.initials: MK
authors.lastname: Weisberg
authors.forename: Iris
authors.initials: I
authors.lastname: Weber
authors.forename: Jack L
authors.initials: JL
authors.lastname: Warren
authors.forename: Michael A
authors.initials: MA
authors.lastname: Velbel
authors.forename: Akira
authors.initials: A
authors.lastname: Tsuchiyama
authors.forename: Peter
authors.initials: P
authors.lastname: Tsou
authors.forename: Alice
authors.initials: A
authors.lastname: Toppani
authors.forename: Naotaka
authors.initials: N
authors.lastname: Tomioka
authors.forename: Kazushige
authors.initials: K
authors.lastname: Tomeoka
authors.forename: Nick
authors.initials: N
authors.lastname: Teslich
authors.forename: Mitra
authors.initials: M
authors.lastname: Taheri
authors.forename: Jean
authors.initials: J
authors.lastname: Susini
authors.forename: Rhonda
authors.initials: R
authors.lastname: Stroud
authors.forename: Thomas
authors.initials: T
authors.lastname: Stephan
authors.forename: Frank J
authors.initials: FJ
authors.lastname: Stadermann
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Snead
authors.forename: Steven B
authors.initials: SB
authors.lastname: Simon
authors.forename: Alexandre
authors.initials: A
authors.lastname: Simionovici
authors.forename: Thomas H
authors.initials: TH
authors.lastname: See
authors.forename: François
authors.initials: F
authors.lastname: Robert
authors.forename: Frans J M
authors.initials: FJ
authors.lastname: Rietmeijer
authors.forename: William
authors.initials: W
authors.lastname: Rao
authors.forename: Murielle C
authors.initials: MC
authors.lastname: Perronnet
authors.forename: Dimitri A
authors.initials: DA
authors.lastname: Papanastassiou
authors.forename: Kyoko
authors.initials: K
authors.lastname: Okudaira
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Ohsumi
authors.forename: Ichiro
authors.initials: I
authors.lastname: Ohnishi
authors.forename: Keiko
authors.initials: K
authors.lastname: Nakamura-Messenger
authors.forename: Tomoki
authors.initials: T
authors.lastname: Nakamura
authors.forename: Smail
authors.initials: S
authors.lastname: Mostefaoui
authors.forename: Takashi
authors.initials: T
authors.lastname: Mikouchi
authors.forename: Anders
authors.initials: A
authors.lastname: Meibom
authors.forename: Graciela
authors.initials: G
authors.lastname: Matrajt
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Marcus
authors.forename: Hugues
authors.initials: H
authors.lastname: Leroux
authors.forename: Laurence
authors.initials: L
authors.lastname: Lemelle
authors.forename: Loan
authors.initials: L
authors.lastname: Le
authors.forename: Antonio
authors.initials: A
authors.lastname: Lanzirotti
authors.forename: Falko
authors.initials: F
authors.lastname: Langenhorst
authors.forename: Alexander N
authors.initials: AN
authors.lastname: Krot
authors.forename: Lindsay P
authors.initials: LP
authors.lastname: Keller
authors.forename: Anton T
authors.initials: AT
authors.lastname: Kearsley
authors.forename: David
authors.initials: D
authors.lastname: Joswiak
authors.forename: Damien
authors.initials: D
authors.lastname: Jacob
authors.forename: Hope
authors.initials: H
authors.lastname: Ishii
authors.forename: Ralph
authors.initials: R
authors.lastname: Harvey
authors.forename: Kenji
authors.initials: K
authors.lastname: Hagiya
authors.forename: Lawrence
authors.initials: L
authors.lastname: Grossman
authors.forename: Jeffrey N
authors.initials: JN
authors.lastname: Grossman
authors.forename: Giles A
authors.initials: GA
authors.lastname: Graham
authors.forename: Matthieu
authors.initials: M
authors.lastname: Gounelle
authors.forename: Philippe
authors.initials: P
authors.lastname: Gillet
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Genge
authors.forename: George
authors.initials: G
authors.lastname: Flynn
authors.forename: Tristan
authors.initials: T
authors.lastname: Ferroir
authors.forename: Stewart
authors.initials: S
authors.lastname: Fallon
authors.forename: Sirine
authors.initials: S
authors.lastname: Fakra
authors.forename: Denton S
authors.initials: DS
authors.lastname: Ebel
authors.forename: Zu Rong
authors.initials: ZR
authors.lastname: Dai
authors.forename: Patrick
authors.initials: P
authors.lastname: Cordier
authors.forename: Benton
authors.initials: B
authors.lastname: Clark
authors.forename: Miaofang
authors.initials: M
authors.lastname: Chi
authors.forename: Anna L
authors.initials: AL
authors.lastname: Butterworth
authors.forename: Donald E
authors.initials: DE
authors.lastname: Brownlee
authors.forename: John C
authors.initials: JC
authors.lastname: Bridges
authors.forename: Sean
authors.initials: S
authors.lastname: Brennan
authors.forename: Adrian
authors.initials: A
authors.lastname: Brearley
authors.forename: John P
authors.initials: JP
authors.lastname: Bradley
authors.forename: Pierre
authors.initials: P
authors.lastname: Bleuet
authors.forename: Phil A
authors.initials: PA
authors.lastname: Bland
authors.forename: Ron
authors.initials: R
authors.lastname: Bastien