Abstract: The orbital dynamics in the orbit determination of Jupiter spacecraft is studied in this paper. Firstly, the spacetime reference systems involved in the Jupiter orbit determination are summarized, and the differences between the Jupiter dynamic time (TDJ) and the barycentric dynamical time (TDB) are compared. Secondly, the orientation parameters of the Jupiter are described, and the relationship between the Jupiter’s celestial reference system and the bodyfixed reference system is given. Thirdly, the dynamical models for Jupiter spacecraft orbit determination is discussed, and the perturbation formulations are given. Finally, the ephemeris data of JUNO are fitted by the dynamical method to verify the dynamic models.

Key words: Jupiter exploration, Orbit determination, Spacetime reference systems, Dynamical models