Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu-A spinning top-shaped rubble pile
Hayabusa2 arrives at the carbonaceous asteroid 162173 Ryugu-A spinning top-shaped rubble pile
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DOI：
10.1126/science.aav8032
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发表时间：
2019-04-19
期刊：
影响因子：
56.9
通讯作者：
Tsuda, Y.
中科院分区：
文献类型：
--
作者：
Watanabe, S.;Hirabayashi, M.;Tsuda, Y.
Hayabusa2航天器于2018年到达近地地球小行星162173 Ryugu。我们介绍了Hayabusa2对Ryugu的形状，质量和地貌学的观察。 Ryugu的“旋转顶部”形状具有突出的圆形赤道脊。它的大量密度为1.19 +/- 0.02克每立方厘米，表明内部高孔（> 50％）。大型表面巨石表明碎石结构。表面斜率分析表明，Ryugu的形状可能是由于曾经以当前速率旋转的两倍而产生的。再加上观察到的全球材料同质性，这表明Ryugu在快速旋转时期通过离心诱导的变形重塑。从这些遥感调查中，我们在赤道山脊上确定了合适的样品收集站点。
The Hayabusa2 spacecraft arrived at the near-Earth carbonaceous asteroid 162173 Ryugu in 2018. We present Hayabusa2 observations of Ryugu's shape, mass, and geomorphology. Ryugu has an oblate "spinning top" shape, with a prominent circular equatorial ridge. Its bulk density, 1.19 +/- 0.02 grams per cubic centimeter, indicates a high-porosity (> 50%) interior. Large surface boulders suggest a rubble-pile structure. Surface slope analysis shows Ryugu's shape may have been produced from having once spun at twice the current rate. Coupled with the observed global material homogeneity, this suggests that Ryugu was reshaped by centrifugally induced deformation during a period of rapid rotation. From these remote-sensing investigations, we identified a suitable sample collection site on the equatorial ridge.