A Novel Ephemeris Model for Martian Moons Incorporating Their Free Rotation  

作　　者：Yong-Zhang Yang Kai Huang Jian-Guo Yan Yu-Qiang Li 

机构地区：[1]Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430070,China

出　　处：《Research in Astronomy and Astrophysics》2024年第11期181-191,共11页天文和天体物理学研究（英文版）

基　　金：supported by the National Key Research and Development Program of China(2021YFA0715101);the National Natural Science Foundation of China(NSFC,grant Nos.12033009 and 12103087);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA0350300);the International Partnership Program of Chinese Academy of Sciences(020GJHZ2022034FN);the Yunnan Fundamental Research Projects(202201AU070225,202301AT070328,202401AT070141);the Young Talent Project of Yunnan Revitalization Talent Support Program。

摘　　要：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 deséphémérides 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 and125 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.

关 键 词：planets and satellites dynamical evolution and stability methods NUMERICAL celestial mechanics ASTROMETRY 

分 类 号：V474[航空宇航科学与技术—飞行器设计]