Daily Processing of Solar System Object Observations by Gaia

By definition, an alert system has to be activated as fast as possible in response to a selected event. For this reason, a pipeline performing fast processing of Gaia observations of Solar System objects (SSO) is being implemented. Its output will concern moving objects that are not matched against an up-to-date catalogue of known asteroids. These "new" Gaia asteroids will have an approximate short-arc orbit determined which can be used to disseminate alerts toward ground-based observers. Without a preliminary orbit (or a bundle of possible orbits) ground-based recovery would be extremely hard, especially for NEOs passing close to Earth, due to the fact that Gaia will orbit around the Lagrangian point L2, thus resulting in a large parallax.