Fast and Slow Rotation of Asteroids

Fast and Slow Rotation of Asteroids
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DOI:
10.1006/icar.2000.6482
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发表时间:
2000-11
期刊:
影响因子:
3.2
通讯作者:
P. Pravec;A. Harris
P. Pravec;A. Harris
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
P. Pravec;A. Harris

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摘要:本文分析了小行星自旋速率随大小的分布。在小于D=40公里的小行星中,特别是小于10公里的小行星(我们的样本主要是近地小行星),存在着大量的慢速和快速旋转体。我们发现,在转速低于≈0.8转/天的情况下,慢旋转体过量存在,而快旋转体组则占据了转速约为0.7转/天的范围。快速旋转的小行星显示出有趣的特征:在绝对星等为h的小行星中,没有自转周期超过2.2 h的天体
Abstract We present an analysis of the distribution of asteroid spin rates vs. size. The existence of significant populations of both slow and fast rotators among asteroids smaller than D=40 km, and especially below 10 km (where our sample is mostly near-Earth asteroids), is shown. We have found that the excess of slow rotators is present at spin rates below ≈0.8 rev/day, and the group of fast rotators occupies the range of spin rates >7 rev/day. The fast rotators show interesting characteristics: The lack of objects rotating faster than 2.2 h period among asteroids with absolute magnitude H