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Title:              An upgraded theory for Helene, Telesto, and Calypso
Authors:            Oberti, P.; Vienne, A.
Affiliation:        AA(Observatoire de la Côte d'Azur, BP 4229, 06304 
                    Nice Cedex 4, France Pascal.Oberti@obs-nice.fr), 
                    AB(Institut de mécanique céleste et de calcul des 
                    éphémérides, UMR 8028 du CNRS and Université de Lille, 1 
                    impasse de l'Observatoire, 59000 Lille, France 
                    Alain.Vienne@imcce.fr)
Journal:            Astronomy and Astrophysics, v.397, p.353-359 (2003) 
                    (A&A Homepage)
Publication Date:   01/2003
Origin:             A&A
A&A Keywords:       planets and satellites: individual: Saturn, planets 
                    and satellites: general, celestial mechanics
Abstract Copyright: (c) 2003: Astronomy & Astrophysics
Bibliographic Code: 2003A&A...397..353O

Abstract

A tridimensional model including the perturbation due to Saturn's oblateness provides accurate solutions for the motions of Tethys and Dione's Lagrangian satellites Telesto, Calypso, and Helene. Expanded around the Lagrangian points and compared to numerical simulations to check their reliabilities, the solutions are fitted to almost twenty years of data thanks to recently published observations. User-friendly compact series give Telesto, Calypso, and Helene's positions and velocities in the mean ecliptic and equinox of J2000.
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