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arXiv 0902.2219astro-ph.EP
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小行星87 Sylvia卫星的稳定性

On the Stability of the Satellites of Asteroid 87 Sylvia

O. C. Winter, L. A. G. Boldrin, E. Vieira Neto, R. Vieira Martins, S. M. Giuliatti Winter, R. S. Gomes, F. Marchis, P. Descamps

摘要:

三重小行星系统(87)Sylvia由一颗280公里的主星和两颗小卫星Romulus和Remus组成(Marchis et al 2005)。西尔维亚位于主小行星带。这些卫星都在接近赤道的圆形轨道上围绕着主星运行。在目前的工作中,我们研究的卫星Romulus和Remus的稳定性,以确定每个扰动的影响和贡献。三体问题的结果,Sylvia-Romulus-Remus,显示它们的轨道根数没有显著的变化。然而,当太阳被包含在系统中时,卫星的倾角呈现出一个长周期的演化。当木星被包括在内时,这种幅度被放大。对这些结果的分析表明,罗穆卢斯和雷穆斯是在一个长期的共振和他们的经度的节点相互锁定振动。卫星与木星发生了共振。然而,卫星的轨道演变变得完全稳定时,西尔维亚扁率在模拟中。

英文摘要:

he triple asteroidal system (87) Sylvia is composed of a 280-km primary and two small moonlets named Romulus and Remus (Marchis et al 2005). Sylvia is located in the main asteroid belt. The satellites are in nearly equatorial circular orbits around the primary. In the present work we study the stability of the satellites Romulus and Remus, in order to identify the effects and the contribution of each perturber. The results from the 3-body problem, Sylvia-Romulus-Remus, show no significant variation of their orbital elements. However, the inclinations of the satellites present a long period evolution, when the Sun is included in the system. Such amplitude is amplified when Jupiter is included. An analysis of these results show that Romulus and Remus are librating in a secular resonance and their longitude of the nodes are locked to each other. The satellites get caught in an evection resonance with Jupiter. However, the orbital evolutions of the satellites became completely stable when the oblateness of Sylvia is included in the simulations.

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