@inproceedings{oai:jaxa.repo.nii.ac.jp:00020438,
 author = {荒井, 武彦 and 岡田, 達明 and 小川, 和律 and 山本, 幸生 and 岩崎, 正統 and 白井, 慶 and 加藤, 學 and Arai, Takehiko and Okada, Tatsuaki and Ogawa, Kazunori and Yamamoto, Yukio and Iwasaki, Masatsuna and Shirai, Kei and Kato, Manabu},
 book = {第40回月・惑星シンポジウム, Proceedings of the 40th ISAS Lunar and Planetary Symposium},
 month = {Jul},
 note = {The Japanese Hayabusa (MUSES-C: Asteroid Sample-return Spacecraft) spacecraft successfully carried out in situ observations of S (4) asteroid 25143 Itokawa. The primary aim of Hayabusa mission is to reveal the relationship between asteroids and meteorites, including a fundamental question whether the asteroids are the parent body of meteorites or not. The XRS (X-Ray Spectrometer) onboard Hayabusa observed X-ray fluorescence emission from the uppermost surface materials of Itokawa, excited by solar X-rays, in order to determine the major elemental composition of Itokawa. The results of analysis indicate that major elemental composition of the surface materials of Itokawa resembles that of chondrite-analogues. In particular, elemental mass ratio of Fe/Si is larger than that of average composition of ordinary chondrites but the corrected result with mineral mixing effect indicates that the Fe/Si ratio is nearly equal to that of average ratio of ordinary chondrites. Since metallic Fe-rich meteorites are ruled out in the candidates of meteorite-analogues of Itokawa in terms of an S (4) subtype asteroids (Gaffey et al., 1993), our result may support that the reason of reddened and darkened features in visible and near infrared reflectance spectrum is space weathering., 資料番号: AA0063723018},
 pages = {73--77},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)},
 title = {Major elemental analysis with XRS onboard Hayabusa and speculation for asteroids and meteorites relations},
 year = {2007}
}