Stability of rubble-pile satellites
Stability of rubble-pile satellites
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DOI：
10.1016/j.icarus.2013.09.023
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发表时间：
2014-02
期刊：
影响因子：
3.2
通讯作者：
I. Sharma
中科院分区：
文献类型：
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作者：
I. Sharma
我们考虑由自身重力结合在一起的碎石堆卫星的稳定性。只要卫星在轨道和结构上对于轨道和结构扰动都稳定，就可以说卫星是稳定的。我们将注意力限制在与各自的轨道半径和相关行星的尺寸相比尺寸较小的卫星上。在这种情况下，我们表明，只要卫星在轨道上对轨道扰动稳定并且在结构上对结构扰动稳定，那么卫星就是稳定的。通过谱分析研究轨道稳定性，通过适当扩展 Sharma 的工作来探讨结构稳定性 [Sharma, I., 2012。旋转非光滑复杂流体的稳定性。 J.流体机械。 708, 71–99; Sharma, I., 2013。碎石堆小行星的结构稳定性。伊卡洛斯 223, 367–382]。然后稳定性测试适用于太阳系的行星卫星，这些行星卫星被怀疑是粒状聚集体，包括许多最近发现的巨行星的较小卫星。
We consider the stability of rubble-pile satellites that are held together by their own gravity. A satellite is said to be stable whenever it is both orbitally and structurally stable to both orbital and structural perturbations. We restrict attention to satellites whose dimensions are small compared to their respective orbital radii and their associated planets’ sizes. In this case, we show that a satellite is stable whenever it is orbitally stable to orbital perturbations and structurally stable to structural perturbations. Orbital stability is investigated by a spectral analysis, while structural stability is probed by appropriately extending the work of Sharma [Sharma, I., 2012. Stability of rotating non-smooth complex fluids. J. Fluid Mech. 708, 71–99; Sharma, I., 2013. Structural stability of rubble-pile asteroids. Icarus 223, 367–382]. The stability test is then applied to planetary satellites of the Solar System that are suspected to be granular aggregates, including many of the recently discovered smaller moons of the giant planets.