期刊
ICARUS
卷 370, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.icarus.2021.114665
关键词
Near-Earth asteroids; Bennu; OSIRIS-REx; Meteorites; Interior structure of asteroids
资金
- NASA, USA [NNM10AA11C]
- NASA OSIRIS-REx Participating Scientists Program [80NSSC18K0280]
- National Aeronautics and Space Administration [80NM0018D0004]
The OSIRIS-REx mission's exploration of asteroid Bennu has provided insights into its interior structure and confirmed the rubble-pile model. Studies on density and size-frequency distribution index show consistency between the interior and surface of Bennu.
Exploration of asteroid (101955) Bennu by the OSIRIS-REx mission has provided an in-depth look at this rubble-pile near-Earth asteroid. In particular, the measured gravity field and the detailed shape model of Bennu indicate significant heterogeneities in its interior structure, compatible with a lower density at its center. Here we combine gravity inversion methods with a statistical rubble-pile model to determine the density and size-frequency distribution (SFD) index of the rubble that constitutes Bennu. The best-fitting models indicate that the SFD of the interior is consistent with that observed on the surface, with a cumulative SFD index of approximately -2.9. The rubble bulk density is approximately 1.35 g/cm(3), corresponding to a 12% macro-porosity. We find the largest rubble particle to be approximately 145 m, whereas the largest void is approximately 10 m.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据