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Science orbits in the Saturn-Enceladus circular restricted three-body problem with oblate primaries
Acta Astronautica ( IF 3.5 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.actaastro.2020.12.045
Francisco Salazar , Adham Alkhaja , Elena Fantino , Elisa Maria Alessi

This contribution investigates the properties of a category of orbits around Enceladus. The motivation is the interest in the in situ exploration of this moon following the detection on behalf of Cassini of plumes of water and organic compounds close to its south pole. In a previous investigation, a set of heteroclinic transfers were designed between Halo orbits around the equilibrium points L1 and L2 of the circular restricted three-body problem with Saturn and Enceladus as primaries. The kinematical and geometrical characteristics of those trajectories makes them good candidates as science orbits for the extended observation of the surface of Enceladus: they are highly inclined, they approach the moon and they are maneuver free. However, the low heights above the surface and the strong perturbing effect of Saturn impose a more careful look at their dynamics, in particular regarding the influence of the polar flattening of the primaries. Therefore, those solutions are here reconsidered by employing a dynamical model that includes the effect of the oblateness of Saturn and Enceladus, individually and in combination. Substitutes of the Halo orbits around the equilibrium points L1 and L2 and their stable and unstable hyperbolic invariant manifolds are obtained in the perturbed models, and maneuver-free heteroclinic transfers are identified in the new framework. A systematic comparison with the corresponding solutions of the unperturbed problem shows that qualitative and quantitative features are not significantly altered when the oblateness of the primaries is taken into account, and that J2 of Saturn plays a larger role than the oblateness of Enceladus. From a mission perspective, the results confirm the scientific value of the solutions obtained in the classical circular restricted three-body problem and suggests that this simpler model can be used in a preliminary feasibility analysis.

中文翻译:

土星-土卫二圆内的科学轨道受限于扁圆主星的三体问题

这项贡献研究了土卫二周围一类轨道的特性。动机是在代表卡西尼号探测到靠近其南极的水柱和有机化合物后,对这颗卫星的原位探索感兴趣。在之前的一项研究中,围绕以土星和土卫二为主的圆形受限三体问题的平衡点 L1 和 L2 的 Halo 轨道之间设计了一组异宿转移。这些轨道的运动学和几何特征使它们成为对土卫二表面进行扩展观测的科学轨道的良好候选者:它们高度倾斜,接近月球并且没有机动性。然而,地表以上的低高度和土星的强烈扰动效应要求更仔细地观察它们的动态,特别是关于原色极地平坦化的影响。因此,这些解决方案在此通过采用包括土星和土卫二扁圆度的单独和组合影响的动力学模型来重新考虑。在扰动模型中获得了围绕平衡点 L1 和 L2 的 Halo 轨道的替代品及其稳定和不稳定的双曲不变流形,并且在新框架中确定了无机动异宿转移。与未扰动问题的相应解决方案的系统比较表明,当考虑原色的扁率时,定性和定量特征没有显着改变,土星的 J2 比土卫二的扁圆度起着更大的作用。从任务的角度来看,结果证实了在经典圆形受限三体问题中获得的解决方案的科学价值,并表明这种更简单的模型可用于初步可行性分析。
更新日期:2021-03-01
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