报告题目: |
New observations of asteroid (4179) Toutatis as closely observed by Chang’e-2 |
报告人: |
季江徽 |
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紫金山天文台
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报告时间: |
2015-12-03 14:00 |
报告地点: |
理科楼三楼报告厅C302 |
主办单位: |
物理系 |
简介: |
Toutatis, as an Apollo near-Earth asteroid in an eccentric orbit, was successfully visited by Chang'e-2 on 13 December 2012 after the spacecraft completed its lunar exploration and an extended mission of space-environment exploration at the Sun-Earth Lagrangian point. This flyby as close as a distance of 770 m away from the asteroid’s surface, reveals many geological features on Toutatis’ surface, like concavities, boulders, lineaments and regolith, particularly an ~ 800 m giant basin at the end of the large lobe as well as a sharply perpendicular silhouette near the neck region, indicating that Toutatis is probably a rubble-pile asteroid (Huang et al. 2013). We further identify more than 200 boulders over the imaged area of Toutatis, and infer that most boulders cannot solely be generated by impact cratering, but probably originate from the fragments of parent body of Toutatis (Jiang, Ji & Huang et al. 2015). Incorporation with ground-based radar observations over the last two decades, we investigate the orientation and the rotational parameters of Toutatis based on the images captured by Chang'e-2. Hence, Chang'e-2's flyby enables us to have an in-depth understanding of the formation and evolution of this asteroid.
Bio: 季江徽，中科院紫金山天文台研究员，现为中国天文学会行星专业委员会主任，中科院行星科学重点实验室副主任，中国天文学会和国际天文联合会会员，曾任第12届、13届“中美Kavli前沿科学研讨会”组委，AOGS 2010 行星科学分会科学组委，我国深空探测科学目标论证专家委员会成员，现任《天文学报》与《天文学进展》编委。长期从事太阳系小天体动力学、太阳系外行星系统形成与动力演化、深空探测轨道与技术等研究。近年来主持承担国家自然科学基金、中科院和江苏省等科研项目共10余项，发表学术论文60余篇。研究成果获得“蔡冠深行星科学奖励基金”二等奖，入选“2007年度十大天文科技进展”、“2012年度十大天文科技进展”与“2013年度十大天文科技进展”。2012年10月获得中国天文学会九十周年天文学突出贡献奖。 2013年度入选江苏省第四期“333高层次人才培养工程”。在国内外会议上多次做大会特邀报告。 |
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