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Orbital dynamics and equilibrium points around an asteroid with gravitational orbit–attitude coupling perturbation

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Abstract

The strongly perturbed dynamical environment near asteroids has been a great challenge for the mission design. Besides the non-spherical gravity, solar radiation pressure, and solar tide, the orbital motion actually suffers from another perturbation caused by the gravitational orbit–attitude coupling of the spacecraft. This gravitational orbit–attitude coupling perturbation (GOACP) has its origin in the fact that the gravity acting on a non-spherical extended body, the real case of the spacecraft, is actually different from that acting on a point mass, the approximation of the spacecraft in the orbital dynamics. We intend to take into account GOACP besides the non-spherical gravity to improve the previous close-proximity orbital dynamics. GOACP depends on the spacecraft attitude, which is assumed to be controlled ideally with respect to the asteroid in this study. Then, we focus on the orbital motion perturbed by the non-spherical gravity and GOACP with the given attitude. This new orbital model can be called the attitude-restricted orbital dynamics, where restricted means that the orbital motion is studied as a restricted problem at a given attitude. In the present paper, equilibrium points of the attitude-restricted orbital dynamics in the second degree and order gravity field of a uniformly rotating asteroid are investigated. Two kinds of equilibria are obtained: on and off the asteroid equatorial principal axis. These equilibria are different from and more diverse than those in the classical orbital dynamics without GOACP. In the case of a large spacecraft, the off-axis equilibrium points can exist at an arbitrary longitude in the equatorial plane. These results are useful for close-proximity operations, such as the asteroid body-fixed hovering.

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Acknowledgments

The authors thank the Editors and two anonymous reviewers for their helpful and constructive comments and suggestions to improve this paper. This work has been supported by the National Natural Science Foundation of China under Grant 11432001.

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Authors and Affiliations

  1. Distributed Space Systems Lab, Faculty of Aerospace Engineering, Technion – Israel Institute of Technology, 32000, Haifa, Israel

    Yue Wang

  2. School of Astronautics, Beihang University, Beijing, 100191, China

    Shijie Xu

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  1. Yue Wang
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  2. Shijie Xu
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Correspondence to Yue Wang.

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Wang, Y., Xu, S. Orbital dynamics and equilibrium points around an asteroid with gravitational orbit–attitude coupling perturbation. Celest Mech Dyn Astr 125, 265–285 (2016). https://doi.org/10.1007/s10569-015-9655-y

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  • DOI: https://doi.org/10.1007/s10569-015-9655-y

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