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A Novel Ephemeris Model for Martian Moons Incorporating Their Free Rotation

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High-precision ephemerides not only support space missions,but can also be used to study the origin and future of celestial bodies.In this paper,a coupled orbit-rotation dynamics model that fully takes into account the rotation of the Martian moons is developed.Phobos and Deimos'rotations are first described by Eulerian rotational equations,and integrated simultaneously with the orbital motion equations.Orbital and orientational parameters of Mars satellites were simultaneously obtained by numerical integration for the first time.In order to compare the differences between our newly developed model and the one now used in the ephemerides,we first reproduced and simulated the current model using our own parameters,and then fit it to the Institut de Mécanique Céleste et de Calcul des Éphémérides ephemerides using least-square procedures.The adjustment test simulations show Phobos and Deimos'orbital differences between the refined model and the current model are no more than 300 m and 125 m,respectively.The orientation parameters are confirmed and the results are in good agreement with the International Astronomical Union results.Moreover,we simulated two perturbations(main asteroids and mutual torques)which were not included in our refined model,and find that their effects on the orbits are completely negligible.As for the effect on rotation,we propose to take care of the role of mutual attraction in future models.

planets and satellites:dynamical evolution and stabilitymethods:numericalcelestial mechanicsastrometry

Yong-Zhang Yang、Kai Huang、Jian-Guo Yan、Yu-Qiang Li

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Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China

University of Chinese Academy of Sciences,Beijing 100049,China

State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430070,China

2024

10.1088/1674-4527/ad86a8

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(11)