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首页> 外文期刊>Journal of guidance, control, and dynamics >Circulating Eccentric Orbits Around Planetary Moons
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Circulating Eccentric Orbits Around Planetary Moons

机译：绕行星月球的偏心轨道

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Eccentric orbits in the third-body perturbed problem are evaluated in the context of planetary-moon missions. All possible motion in the doubly averaged problem is reviewed and concisely summarized via contour plots. Special attention is paid to the well-known class of orbits that cycle between low and high eccentricity while circulating in argument of periapse. Applying the doubly averaged assumptions, the maximum sustainable inclinations and eccentricities for long-term circulating ballistic orbits are found and discussed for the dimensioned systems at Ganymede, Europa, Titan, Enceladus, and several other planetary moons. The full-cycle periods of the circulations and librations are reduced to quadratures that are functions only of the two integrals of motion and the moon and orbiter mean motions. In the specific case of Ganymede, higher-fidelity models are considered to analyze the validity of the doubly averaged assumptions. Families of stable long-repeat-cycle periodic orbits are demonstrated in the unaveraged Hill-plus-nonspherical-potential model. Several point designs are considered in a full ephemeris model, and promising results include long-term ephemeris-stable orbits that enjoy maximum inclinations above 60 deg. These circulating "ball-of-yarn" orbits cycle between high and low eccentricities while distributing close approaches throughout the moon's surface.
机译：在行星月球任务的背景下，对第三体扰动问题中的偏心轨道进行了评估。通过等高线图，可以对双重平均问题中的所有可能运动进行回顾和简明总结。特别注意众所周知的绕着低偏心率在高偏心率之间循环的轨道，同时围绕着近星点进行循环。应用双重平均假设，发现并讨论了Ganymede，Europa，Titan，Enceladus和其他几个行星卫星的尺寸系统的长期循环弹道的最大可持续倾角和偏心率。循环和自由运动的全周期周期减少到正交，该正交仅是运动和月球与轨道平均运动这两个积分的函数。在Ganymede的特定情况下，考虑使用更高保真度的模型来分析双倍平均假设的有效性。稳定的长重复周期轨道族在非平均的Hill加非球面势模型中得到了证明。在完整的星历模型中考虑了几个点设计，并且有希望的结果包括长期星历稳定的轨道，这些轨道在60度以上具有最大倾角。这些循环的“纱球”轨道在高和低偏心率之间循环，同时在整个月球表面分布近距离。

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