Regolith migration and sorting on asteroid Itokawa
Regolith migration and sorting on asteroid Itokawa
复制标题
DOI：
10.1126/science.1134390
复制
发表时间：
2007-05-18
期刊：
影响因子：
56.9
通讯作者：
Sasaki, Sho
中科院分区：
文献类型：
--
作者：
Miyamoto, Hideaki;Yano, Hajime;Sasaki, Sho
隼鸟使命飞行任务获得的小行星丝川表面高分辨率图像显示，它被松散的毫米级和更大的砾石覆盖。这些砾石的位置和形态特征表明，Itokawa经历了相当大的振动，在其干燥，真空，微重力环境中引发了全球规模的颗粒过程。这些过程可能包括颗粒对流、滑坡状颗粒迁移和颗粒分选，导致细砾石分离成潜在低点。由于丝川小行星的体积小，颗粒化过程成为主要的表面重塑过程，这意味着如果其他小行星有风化层，它们也可能发生。
High-resolution images of the surface of asteroid Itokawa from the Hayabusa mission reveal it to be covered with unconsolidated millimeter-sized and larger gravels. Locations and morphologic characteristics of this gravel indicate that Itokawa has experienced considerable vibrations, which have triggered global-scale granular processes in its dry, vacuum, microgravity environment. These processes likely include granular convection, landslide-like granular migrations, and particle sorting, resulting in the segregation of the fine gravels into areas of potential lows. Granular processes become major resurfacing processes because of Itokawa's small size, implying that they can occur on other small asteroids should those have regolith.