标题： 由碰撞引起的非球形小行星缓慢增加的拉伸 显示英文标题

标题： Slowly increasing elongations of non-spherical asteroids caused by collisions

摘要： 小行星经常与小型投射体发生碰撞。虽然每次单独的小型碰撞并不十分重要，但它们的累积效应可能会显著改变地形，并且也会改变小行星的整体形状。我们对单个小行星目标（用三轴椭球体表示）进行了随机碰撞模拟。我们研究了直径从几百米到约18公里的小行星，假设所有由碰撞挖出的物质都会逃离小行星。这些碰撞的累积效应是小行星形状的拉长程度增加。然而，这一过程的时间尺度远远长于小行星的碰撞寿命。因此，我们认为小型碰撞可能并不是导致小型小行星整体形状形成的原因。 显示英文摘要

摘要： Asteroids are frequently colliding with small projectiles. Although each individual small collision is not very important, their cumulative effect can substantially change topography and also the overall shape of an asteroid. We run simulations of random collisions onto a single target asteroid represented by triaxial ellipsoid. We investigated asteroids of several hundred meters to about 18 km in diameter for which we assumed all material excavated by the collision to escape the asteroid. The cumulative effect of these collisions is an increasing elongation of the asteroid figure. However, the estimated timescale of this process is much longer than the collisional lifetime of asteroids. Therefore, we conclude that small collisions are probably not responsible for the overall shape of small asteroids.