Abstract
We consider a system of planets defined by a given distribution of mean mean motions and masses: we represent the osculating elliptic elements of their heliocentric orbits by quasi-periodic functions of time, through a method adapted to the commensurability case; these functions are the sum of the general solution of a critical system, expressed in long-period terms, and of a particular solution. As in the B. Brown's method (applied to the galilean satellites), the critical system contains the secular terms, the longperiod terms (great inequalities), and the resonant terms; the particular solution consists of short-period terms only, whose amplitude is an explicit function of the solution of the critical system.
If all the long-period terms in the critical system are harmonic of one fundamental term, we can perform a simple change of variables which transforms the critical system in an autonomous one, and thus we reduce the resolution to an eigenvalue problem. Applying that to the galilean satellites of Jupiter and neglecting the solar perturbations, we obtain a differential system with constant coefficients, whose linear part concerns all the variables (including the major-axes and the mean longitudes) and gives, as a first approximation, the great inequalities, the free oscillations and the libration; nevertheless this solution agrees already with known results, but should be improved by taking into account the non-linear parts and the solar terms in a new approximation.
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Proceedings of the Conference on ‘Analytical Methods and Ephemerides: Theory and Observations of the Moon and Planets’. Facultés universitaires Notre Dame de la Paix, Namur, Belgium, 28–31 July, 1980
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Duriez, L. Theorie generale planetaire etendue au cas de la resonance et application au systeme des satellites galileens de Jupiter. Celestial Mechanics 26, 231–255 (1982). https://doi.org/10.1007/BF01230719
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DOI: https://doi.org/10.1007/BF01230719