Synthetic representation of the Galilean satellites' orbital motions from L1 ephemerides

Valéry Lainey (1, 2, 3) , Luc Duriez (4, 2, 3) , Alain Vienne (4, 2, 3)

1 ROB - Royal Observatory of Belgium = Observatoire Royal de Belgique
2 IMCCE - Institut de Mécanique Céleste et de Calcul des Ephémérides
3 GAP - Groupe Astrométrie et Planétologie
4 LAL - Laboratoire d'Astronomie de Lille

Aims.We aim to provide a synthetic representation of the orbital motion of Io, Europa, Ganymede, and Callisto. It corresponds to a quasi-periodic Fourier series whose arguments are integer combinations of the fundamental arguments of the dynamical system, which are also given.
Methods: .The present series are issued from frequency analysis and digital filtering treatments. The initial samplings have been taken from a former numerical integration fit to the observations and referenced as L1 ephemerides.
Results: .Our representation allows for the identification of all the significant perturbations in the system, which helps us to understand these orbital motions. It is also useful in other related topics: the dynamical history of the system and studies requiring us to extract only major terms to compute motions such as the rotation of the bodies.

Domaines: Astrophysique [astro-ph]

Valéry Lainey, Luc Duriez, Alain Vienne. Synthetic representation of the Galilean satellites' orbital motions from L1 ephemerides. Astronomy and Astrophysics - A&A, 2006, 456, pp.783-788. ⟨10.1051/0004-6361:20064941⟩. ⟨hal-03784955⟩