网站地图 联系我们 English 中国科学院
首页紫台简介机构设置新闻动态科研成果研究队伍合作交流天文学院创新文化党群园地信息公开
新闻动态
图片新闻
综合新闻
天文快讯
Colloquium & 学术交流
国内外天文学术会议
紫台通讯
传媒扫描
科普动态
科研信息
台内新闻
您当前的位置:首页>新闻动态>Colloquium & 学术交流
7月7日 The Strength of Rubble Pile Asteroids: Evidence and Implications (Planetary Science topic), which I plan it as a report to the university undergraduates and graduates
2017年07月03日

  报告题目:The Strength of Rubble Pile Asteroids: Evidence and Implications (Planetary Science topic), which I plan it as a report to the university undergraduates and graduates

  报告人:Prof. Daniel J. Scheeres

  摘要:Rubble pile asteroids have been frequently characterized as being cohesionless, self-gravitating aggregates of boulders and grains. This picture has motivated many geophysical theories for how these bodies evolve in the solar system, and what assumptions can be made concerning their evolution and exploration. However, recent astronomical observations of asteroid 1950DA and active asteroid P/2013 R3 have provided evidence that this picture is incomplete, and indeed that rubble pile asteroids can exhibit a degree of cohesion between their components. The net effect of even small amounts of cohesion has significant implications for the evolution of small asteroids in the main belt and in the NEA population, and will be reviewed. A recent theory by Sanchez and Scheeres provides one hypothesis for how such cohesive strength could exist in gravitationally attracting aggregates — through weak van der Waals attractive forces between the finest grains in a rubble pile. This theory has several additional implications for the asteroid environment that have specific predictions that can be probed with both ground-based observations and with spacecraft rendezvous missions such as Hayabusa II and OSIRIS-REx.

  时间:7月7日(周五)上午10点

  地点:仙II 311

欢迎各位老师、同学参加!

                                         南京大学天文与空间科学学院

地址:(210034)南京市栖霞区元化路8号(南大科学园内) 电话:86-25-83332000 传真:86-25-83332091
版权所有:中国科学院紫金山天文台 http://www.pmo.cas.cn pmoo@pmo.ac.cn 备案序号:苏ICP备05007736号