Boulders on asteroid toutatis as observed by chang e-2

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题名:	Boulders on asteroid toutatis as observed by chang e-2
作者:	葉永烜;Jiang, Yun;Ji, Jianghui;Huang, Jiangchuan;Marchi, Simone;Li, Yuan;Ip, Wing-Huen
贡献者:	理學院天文研究所
关键词:	639/33/445;704/445/848;Asteroids;Frequency distribution;Geology;Humanities and Social Sciences;Morphology;multidisciplinary;Preservation;Science;Spacecraft;Spatial distribution
日期:	2015-11-02
上传时间:	2026-04-21 14:43:11 (UTC+8)
出版者:	Nature Publishing Group;London: Springer Science and Business Media LLC
摘要:	摘要： AbstractBoulders are ubiquitously found on the surfaces of small rocky bodies in the inner solar system and their spatial and size distributions give insight into the geological evolution and collisional history of the parent bodies. Using images acquired by the Chang’e-2 spacecraft, more than 200 boulders have been identified over the imaged area of the near-Earth asteroid Toutatis. The cumulative boulder size frequency distribution (SFD) shows a steep slope of −4.4 ± 0.1, which is indicative of a high degree of fragmentation. Similar to Itokawa, Toutatis probably has a rubble-pile structure, as most boulders on its surface cannot solely be explained by impact cratering. The significantly steeper slope for Toutatis’ boulder SFD compared to Itokawa may imply a different preservation state or diverse formation scenarios. In addition, the cumulative crater SFD has been used to estimate a surface crater retention age of approximately 1.6 ± 0.3 Gyr. 其他題名： Sci Rep 出版者： London: Springer Science and Business Media LLC 出版日期： 2015-11-02 出處： Scientific Reports, 2015-11, Vol.5 (1), p.16029-16029, Article 16029 資源來源： Publicly available content database 版權： The Author(s) 2015 版權： Copyright Nature Publishing Group Nov 2015 版權： Copyright © 2015, Macmillan Publishers Limited 2015 Macmillan Publishers Limited 識別號： ISSN: 2045-2322 識別號： EISSN: 2045-2322 識別號： DOI: 10.1038/srep16029 識別號： PMID: 26522880
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