Other
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..696d&link_type=abstract
European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht
Other
Scientific paper
The Gaia mission of the European Space Agency (ESA) will observe a large number of asteroids and other small Solar System objects for 5 years, up to a magnitude limit V=20. The expected astrometric single observation precision of the mission is around 0.2 milli-arcseconds (mas) at V = 15, or 2 mas at V = 20. At this precision level, subtle non-gravitational perturbations on the orbits of small asteroids, such as the Yarkovsky effect, are in principle measurable. The latter, which causes a slow drifting of the orbits of km-sized asteroids, is due to the emission of thermal photons which carry off momentum. The Yarkovsky effect is believed to play a role in the delivery of near-Earth asteroids (NEAs) from the main belt, in the spreading of the orbital elements of asteroid families, and in the orbital evolution of potentially hazardous asteroids. We will present a set of simulations devoted to study how this effect can be detected by Gaia measurements and how asteroids' physical parameters can be constrained from the Yarkovsky astrometric signal.
Carpino Mario
Delbo' Marco
Havel Mathieu
Hestroffer Daniel
Mignard François
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