奇特的小行星——灶神星

发布时间：2018-06-17 08:20

本文选题：灶神星 + 小行星　；参考：《自然杂志》2013年03期

【摘要】：灶神星(Vesta)是小行星主带的最大成员之一。主带的最大成员——谷神星(Ceres)已归类为矮行星,灶神星也是候选的矮行星。不同于其他类型的小行星,灶神星是很奇特的。灶神星的光谱跟HED陨石相似,因而推断它是该群陨石的母体。在灶神星族小行星和V型小行星中,其他小行星都很小,可认为它们是灶神星受撞击而抛出的碎块。跟含水的谷神星不同,灶神星是缺水的火成岩石星,因此,它们倍受关注。为揭示谷神星和灶神星的奥秘,美国专门发射黎明号(Dawn)飞船去探测它们,现在已完成了环绕灶神星一年多的探测,正在飞往谷神星途中。黎明号飞船所摄的灶神星图像令人大为震惊,其南极区有两个大陨击盆地,证实了它曾受到巨大撞击所抛出碎块成为有关的小行星和陨石,并且造成其赤道区的大沟槽。灶神星有相似于类地行星的核、幔、壳结构和早期演化史,可能是遗留的原行星(protoplanet),因而,对灶神星的研究将有助于了解类地行星的起源和早期演化等问题。
[Abstract]:Vesta is one of the largest members of the asteroid belt. Ceres, the largest member of the main band, has been classified as a dwarf planet and Vesta is a candidate dwarf planet. Unlike other types of asteroids, Vesta is very strange. Vesta's spectrum is similar to that of HED meteorites, so it is assumed that Vesta is the parent of this group of meteorites. Of the Vesta and V asteroids, the other asteroids are small and are thought to be fragments thrown out by Vesta's impact. Unlike watery cereal stars, Vesta is a water-deficient igneous rock star that has attracted much attention. To reveal the mysteries of Ceres and Vesta, the United States has launched the Dawn Dawn spacecraft to detect them. It has now completed more than a year of exploration around Vesta and is on its way to Cereus. The Vesta image taken by the Dawn spacecraft is startling, with two large meteorite impact basins in its Antarctic region, confirming that it was thrown fragments into related asteroids and meteorites by a huge impact and created large grooves in its equatorial region. Vesta has a core, mantle, shell structure and early evolution history similar to that of Earth-like planets, and may be a legacy of protoplanetons. Therefore, the study of Vesta will be helpful to understand the origin and early evolution of Earth-like planets.
【作者单位】：南京大学天文学与空间科学学院;
【分类号】：P185.7

【相似文献】