Analysis of geological activities of asteroids using high definition shape models

2015 Fiscal Year Final Research Report

• Project/Area Number: 25287114
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: The University of Aizu
• Principal Investigator: Hirata Naru 会津大学, コンピュータ理工学部, 上級准教授 (80372655)
• Co-Investigator(Kenkyū-buntansha): DEMURA Hirohide 会津大学, コンピュータ理工学部, 教授 (10360009) ; SUGITA Seiji 東京大学, 理学研究科, 教授 (80313203) ; NARUSE Keitarou 会津大学, コンピュータ理工学部, 上級准教授 (10301938) ; OHTA Naoya 群馬大学, 理工学研究院, 教授 (10270860) ; TAKAHASHI Shigeo 会津大学, コンピュータ理工学部, 教授 (40292619) ; YAGUCHI Yuichi 会津大学, コンピュータ理工学部, 准教授 (00609109) ; ISHIKAWA Hiroshi 早稲田大学, 理工学術院, 教授 (60381901)
• Co-Investigator(Renkei-kenkyūsha): OGAWA Naoko 独立行政法人宇宙航空研究開発機構, 宇宙探査イノベーションハブ, 研究員 (10523813)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 小惑星 / 形状モデル / 3次元地理情報システム / Stereo photoclinometry / Structure-from-Motion / 衝突現象

Outline of Final Research Achievements

We developed a method for high resolution 3D shape reconstruction of asteroids with a combination of SPC and SfM methods and a 3D geographical information system for asteroid data analysis. By utilizing these research environment, we analyzed image data of the asteroid Itokawa taken by the Hayabusa spacecraft to reveal new views on a small rubble-pile asteroid. We describe a resurfacing history of Itokawa by impact events. It is suggested that Itokawa was suffered by a global resurfacing event on several Myr ago, which is consistent with evidence from samples recovered from Itokawa.

Free Research Field

惑星科学