Rotational effect as the possible cause of the east-west asymmetric crater rims on Ryugu observed by LIDAR data

Rotational effect as the possible cause of the east-west asymmetric crater rims on Ryugu observed by LIDAR data
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LIDAR数据观测到的龙宫火山口边缘东西向不对称的可能原因是旋转效应

DOI:
10.1016/j.icarus.2020.114073
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发表时间:
2021
期刊:
影响因子:
3.2
通讯作者:
Watanabe Sei-ichiro
Watanabe Sei-ichiro
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hirata Naoyuki;Namiki Noriyuki;Yoshida Fumi;Matsumoto Koji;Noda Hirotomo;Senshu Hiroki;Mizuno Takahide;Terui Fuyuto;Ishihara Yoshiaki;Yamada Ryuhei;Yamamoto Keiko;Abe Shinsuke;Noguchi Rina;Hirata Naru;Tsuda Yuichi;Watanabe Sei-ichiro

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小行星162,173 Ryugu是一颗碎石堆小行星,其顶部形状与旋转变形模型兼容。龙谷上的主要陨石坑的边缘呈东西不对称的轮廓;它们的西部陨石坑边缘尖锐而高,而东部陨石坑边缘则是圆形而低。虽然有各种可能的解释,我们从理论上评估小行星旋转的影响,作为这种东西不对称的可能原因。众所周知,喷出物的轨迹和命运受到旋转的影响。旋转表面的科氏力和惯性速度是改变喷出物轨迹的因素。因此,我们发现,东西不对称的环形山边缘可能是旋转的结果,当旋转表面的惯性速度几乎等于第一宇宙速度的身体。换句话说,观测到的浦岛、森德里隆和科洛博克陨石坑的东西不对称边缘可能是在龙宫自转周期约3.6小时时形成的。
Asteroid 162,173 Ryugu is a rubble-pile asteroid, whose top-shape is compatible with models of deformation by spin up. Rims of major craters on Ryugu have an east–west asymmetric profile; their western crater rims are sharp and tall, while their eastern crater rims are rounded and low. Although there are various possible explanations, we theoretically assess the effect of asteroid rotation as the possible reason for this east–west asymmetry. It is known that the trajectories and fates of ejecta are affected by the rotation. The Coriolis force and the inertial speed of the rotating surface are the factors altering the ejecta trajectories. Consequently, we found that the east–west asymmetric crater rims might be formed as a result of rotation, when the inertial speed of the rotating surface is nearly equal to the first cosmic velocity of the body. In other words, it is possible that the observed east–west asymmetric rims of the Urashima, Cendrillon, and Kolobok craters were formed when Ryugu's rotation period was ~3.6 h.
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