Astrométrie des satellites naturels : analyse d'observations anciennes pour l'amélioration des paramètres dynamiques des systèmes planétaires

TL;DRAbstract

The current study deals with the astrometric reduction of old photographic plates : we observe in the past. The main objective is to demonstrate that it is now possible to provide high-precise astrometric positions, by reducing a new time old photographic observations. We used photographic plates of the Galilean satellites taken at the McCormick Observatory and the U.S. Naval Observatory between 1967 and 1998, and resulting in 2650 observations. Of course we had to create a complete procedure of analysis. We first digitized the entire plates archive with taking care of the process itself, not to decrease the accuracy at this point. Then we created a procedure in order to provide astrometric positions. Softwares were developed to identify, extract and correct the positions, from the digitizations. A new astrometric reduction method by linking the stars was especially developed for the photographic plates' analysis to determine high-precise (RA,Dec) astrometric positions and intersatelli

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