The Hill stability of triple minor planets in the Solar system

The Hill stability of triple minor planets in the Solar system
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太阳系三小行星的希尔稳定性

DOI:
10.1111/j.1365-2966.2012.22019.x
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发表时间:
2012-11
影响因子:
4.8
通讯作者:
Georgakarakos, N.
Georgakarakos, N.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liu, X.;Baoyin, H.;Georgakarakos, N.

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自2004年发现第一个三重小行星系统以来,科学界对太阳系中的三重小行星和三重柯伊伯带天体(统称为三重小行星)特别感兴趣。本文研究了太阳系中九颗已知的三重小行星的Hill稳定性。其中七个系统的大小比较大,即它们由一个较大的主星和两个小卫星组成,而其他两个系统的组成部分大小相当。每一个案例都是单独处理的。对于具有大尺寸比的三重小行星,给出了Hill稳定性的充分条件的封闭形式。这是不可能的系统具有可比的大小组件,希尔稳定性的分析和数值方法相结合的评估。结果表明,除了3749 Balam外,所有已知的三重小行星都是Hill稳定的,因为其轨道参数不完整,使得系统的Hill稳定性不确定。这表明太阳系中可能还有更多这样稳定的三重小行星有待观察。它还表明,希尔稳定区域增加的相互之间的倾斜度的内部和外部轨道的减小,半长轴比的内部轨道相对于外部轨道的减小,和外部卫星的质量比相对于内部卫星的增加。因此,这项研究提供了有用的信息,在太阳系中的三重小行星的动力学特性。
The triple asteroids and triple Kuiper belt objects (collectively called triple minor planets) in the Solar system are of particular interest to the scientific community since the discovery of the first triple asteroid system in 2004. In this paper, the Hill stability of the nine known triple minor planets in the Solar system is investigated. Seven of the systems are of large size ratio, that is, they consist of a larger primary and two moonlets, while the other two systems have components of comparable size. Each case is treated separately. For the triple minor planets that have large size ratio, the sufficient condition for Hill stability is expressed in a closed form. This is not possible for the systems with comparable size components, for which the Hill stability is assessed by a combination of analytical and numerical means. It is found that all the known triple minor planets are Hill stable, except 3749 Balam, for which the incomplete orbital parameters make the Hill stability of the system uncertain. This suggests that there might be more such stable triple minor planets in the Solar system yet to be observed. It is also shown that the Hill stability regions increase as the mutual inclination between the inner and outer orbits decreases, the semimajor axis ratio of the inner orbit with respect to the outer orbit decreases, and the mass ratio of the outer satellite with respect to the inner satellite increases. This study therefore provides useful information about dynamical properties of the triple minor planets in the Solar system.
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发表时间: 2009-03
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