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Title:
Astrometry of asteroids with the Gaia space mission
Authors:
Hestroffer, D.; Babusiaux, C.; Mignard, F.; Arenou, F.; Berthier, J.; Chereau, F.; Mignot, S.; Mouret, S.
Publication:
SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli, T. Contini, J.M. Hameury and L. Pagani. Published by EdP-Sciences, Conference Series, 2005, p. 117
Publication Date:
12/2005
Origin:
AUTHOR
Bibliographic Code:
2005sf2a.conf..117H

Abstract

The ESA cornerstone space mission Gaia (Perryman et al. 2005), to be launched in 2011, will provide a 3D census of the Galaxy by observing a huge number of stars with an unprecedented astrometric accuracy (approx. 20 micro-arcsecond at V˜15 and down to V≤20). In addition the satellite will provide astrometric, spectometric and photometric measurements for a large number of solar system objects, mainly asteroids. Focusing on the astrometric measurements, we present the peculiarities of solar systems observation with the Gaia scanning satellite. Next we discuss how Gaia observations of Trojans, main-belt, and near-Earth asteroids will provide 1) orbit improvement, 2) asteroids mass determination, and 3) direct determination of the solar J2 and relativistic PPN parameters. Interestingly these two latter parameters will be obtained directly and simultaneously, without any assumption on the internal structure of the Sun. In all aspects the scientific results achievable with Gaia appear to be competitive with present and future ground- or space-based experiments.
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