A new picture of an asteroid by searching from Itokawa particles.

2014 Fiscal Year Final Research Report

• Project/Area Number: 24244086
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Kyoto University
• Principal Investigator: TSUCHIYAMA Akira 京都大学, 理学(系)研究科(研究院), 教授 (90180017)
• Co-Investigator(Kenkyū-buntansha): HIRATA Takehumi 京都大学, 大学院理学研究科, 教授 (10251612)
• Co-Investigator(Renkei-kenkyūsha): TOH Shoichi 福岡大学, 理学部, 助教 (20380595) ; TERADA Kentaro 大阪大学, 大学院理学研究科, 教授 (20263668) ; MIYAKE Akira 京都大学, 大学院理学研究科, 准教授 (10324609) ; MATSUSHIMA Takashi 筑波大学, 大学院システム情報工学研究科, 准教授 (60251625) ; YANO Hajime 宇宙航空研究開発機構, 宇宙科学研究所, 助教 (00321571)
• Research Collaborator: MATSUMOTO Toru ; MATSUNO Junya
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: はやぶさ計画 / 隕石 / レゴリス / 宇宙風化 / ３次元構造 / X線CT / 衝突 / 太陽風照射

Outline of Final Research Achievements

Fine particles collected from the surface of Asteroid Itokawa by the “Hayabusa” mission were examined based on the preliminary examination results, and the following results were achieved. (1) The analyzed samples are almost representative for the whole collected samples although they are very small in amount, and it was finally confirmed by comparing with meteorites that the materials on the S-type Asteroid correspond to meteorites, particularly ordinary chondrites (LL chondrites). (2) We successfully obtained dynamic picture about asteroid surface evolution that space-weathering proceeds by combined and repeated processes of particle formation due to impact, space-weathering rim formation on particle surfaces due to solar wind implantation, and particle abrasion due to particle motion.

Free Research Field

惑星物質科学