论文标题
旋转效应是向东不对称火山口缘对LIDAR数据观察到的Ryugu的可能原因
Rotational effect as the possible cause of the east-west asymmetric crater rims on Ryugu observed by LIDAR data
论文作者
论文摘要
小行星162173 Ryugu是一种碎石小行星，其顶形与通过旋转的变形模型兼容。 Ryugu上的主要火山口的边缘具有东西方的不对称曲线；他们的西部火山口锋利又高又高，而东部火山口窗缘圆润且较低。尽管有各种可能的解释，但我们从理论上评估了小行星旋转的效果，这是这种东西向不对称的可能原因。众所周知，喷射的轨迹和命运受旋转影响。旋转表面的科里奥利力和惯性速度是改变喷射轨迹的因素。因此，我们发现，当旋转表面的惯性速度几乎等于人体的第一个宇宙速度时，东西方不对称的火山口轮辋可能是旋转形成的。换句话说，当Ryugu的旋转周期约为3.6 h时，可能形成了观测到的Urashima，Cendrillon和Kolobok Craters的东西不对称边缘。
Asteroid 162173 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.
