Discovery of Grooves on Gaspra
Discovery of Grooves on Gaspra
复制标题
Gaspra 上凹槽的发现
DOI：
10.1006/icar.1994.1007
复制
发表时间：
1994
期刊：
影响因子：
3.2
通讯作者：
G. Neukum
中科院分区：
文献类型：
--
作者：
J. Veverka;P. Thomas;D. Simonelli;M. Belton;M. Carr;C. Chapman;M. Davies;R. Greeley;R. Greenberg;J. Head;K. Klaasen;T. Johnson;D. Morrison;G. Neukum
摘要我们报道了在Gaspra的伽利略高分辨率图像中发现的凹槽。这些以前只在火星卫星火卫一上看到的特征，很可能与严重的撞击有关。Gaspra上的凹槽呈线性凹陷状，通常宽100-200米，长0.8 - 2.5公里，深10-20米。大多数的小行星都有两个主要的群，其中一个群的走向近似平行于小行星的长轴，但偏移了约15°;另一个群近似垂直于这一走向。这些方向中的第一个方向福尔斯沿着平行于由托马斯等人确定的三个延伸的平坦小平面的平面族，第107章. Gaspra上的凹槽与其他迹象（不规则形状，陨石坑记录）一致，表明这颗小行星经历了激烈的碰撞历史。大沟方向和其他结构元素的全身一致性表明，今天的Gaspra是一个全球连贯的机构。
Abstract We report the discovery of grooves in Galileo high-resolution images of Gaspra. These features, previously seen only on Mars' satellite Phobos, are most likely related to severe impacts. Grooves on Gaspra occur as linear and pitted depressions, typically 100-200 m wide, 0.8 to 2.5 km long, and 10-20 m deep. Most occur in two major groups, one of which trends approximately parallel to the asteroid's long axis, but is offset by some 15°; the other is approximately perpendicular to this trend. The first of these directions falls along a family of planes which parallel three extensive flat facets identified by Thomas et al., Icarus 107. The occurrence of grooves on Gaspra is consistent with other indications (irregular shape, cratering record) that this asteroid has evolved through a violent collisional history. The bodywide congruence of major groove directions and other structural elements suggests that present-day Gaspra is a globally coherent body.