title: Oxygen isotopic compositions of asteroidal materials returned from Itokawa by the Hayabusa mission.
abstract: Meteorite studies suggest that each solar system object has a unique oxygen isotopic composition. Chondrites, the most primitive of meteorites, have been believed to be derived from asteroids, but oxygen isotopic compositions of asteroids themselves have not been established. We measured, using secondary ion mass spectrometry, oxygen isotopic compositions of rock particles from asteroid 25143 Itokawa returned by the Hayabusa spacecraft. Compositions of the particles are depleted in (16)O relative to terrestrial materials and indicate that Itokawa, an S-type asteroid, is one of the sources of the LL or L group of equilibrated ordinary chondrites. This is a direct oxygen-isotope link between chondrites and their parent asteroid.
authors.affiliation: Natural History Sciences, Hokkaido University, Sapporo 060-0810, Japan. yuri@ep.sci.hokudai.ac.jp
authors.forename: Hisayoshi
authors.initials: H
authors.lastname: Yurimoto
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Abe
authors.forename: Masanao
authors.initials: M
authors.lastname: Abe
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Ebihara
authors.forename: Akio
authors.initials: A
authors.lastname: Fujimura
authors.forename: Minako
authors.initials: M
authors.lastname: Hashiguchi
authors.forename: Ko
authors.initials: K
authors.lastname: Hashizume
authors.forename: Trevor R
authors.initials: TR
authors.lastname: Ireland
authors.forename: Shoichi
authors.initials: S
authors.lastname: Itoh
authors.forename: Juri
authors.initials: J
authors.lastname: Katayama
authors.forename: Chizu
authors.initials: C
authors.lastname: Kato
authors.forename: Junichiro
authors.initials: J
authors.lastname: Kawaguchi
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Kawasaki
authors.forename: Fumio
authors.initials: F
authors.lastname: Kitajima
authors.forename: Sachio
authors.initials: S
authors.lastname: Kobayashi
authors.forename: Tatsuji
authors.initials: T
authors.lastname: Meike
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Mukai
authors.forename: Keisuke
authors.initials: K
authors.lastname: Nagao
authors.forename: Tomoki
authors.initials: T
authors.lastname: Nakamura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Naraoka
authors.forename: Takaaki
authors.initials: T
authors.lastname: Noguchi
authors.forename: Ryuji
authors.initials: R
authors.lastname: Okazaki
authors.forename: Changkun
authors.initials: C
authors.lastname: Park
authors.forename: Naoya
authors.initials: N
authors.lastname: Sakamoto
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Seto
authors.forename: Masashi
authors.initials: M
authors.lastname: Takei
authors.forename: Akira
authors.initials: A
authors.lastname: Tsuchiyama
authors.forename: Masayuki
authors.initials: M
authors.lastname: Uesugi
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Wakaki
authors.forename: Toru
authors.initials: T
authors.lastname: Yada
authors.forename: Kosuke
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Makoto
authors.initials: M
authors.lastname: Yoshikawa
authors.forename: Michael E
authors.initials: ME
authors.lastname: Zolensky