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Accueil > Séminaires > Archive des séminaires d’Utinam > Archive des séminaires d’astrophysique (jusqu’en 2011) > 2007

Asteroid modelling and data analysis for the improvement of the planetary ephemerides

par Edith Burgey -

Mardi 23 octobre 2007

Lucia Somenzi

post-doctorante à l’Institut UTINAM (équipe ARTE)

Résumé :

My research activity is carried out within the project to develop a numerical solution for the planetary ephemerides of the solar system. This task has been undertaken by a team of scientists working at the Observatories of Paris and Besançon. These researchers have built a numerical software for the planets’ ephemerides, called INPOP (Intégrateur Numérique Planétaire de l’Observatoire de Paris). The INPOP planetary ephemerides have already reached an accuracy comparable to the JPL one (Fienga et al. 2007). As a consequence, INPOP represents a very competitive solution, and it may give ESA the precious opportunity of using valuable planetary ephemerides independently of NASA.

The objective of my research plan is twofold. First, I intend to improve the modelling of the asteroids. The poor knowledge in most of their masses represents in fact one of the major limits to the present accuracy of the planets’ orbits. My second purpose is to extend the planetary ephemerides fits by including in the analysis the new range data coming from Mars Express and Venus Express, collected over the course of the missions.

After having presented a general view of the planetary ephemerides determination, I will focus on the problem of the asteroids, and will describe the strategies chosen to model in the best possible way the asteroid gravitational perturbations affecting the planets’ orbital dynamics.