The ESA mission Gaia, which is currently surveying the sky from the
Sun-Earth L2 Lagrangian Point, is providing astrometry of stars and
asteroids at few mas. The first Gaia Data Release, which
includes 2 millions of stars with position, parallaxes, and proper
motion and a position catalog of 1.1 billion of stars, has already
shown the strength of this unprecedented power of investigation.
The next Gaia data release in April 2018 will contain not only
billions of stars with proper motions and parallaxes, but also the
observations for more than 10.000 asteroids. I have already exploited
the contribution of the first Gaia data release to asteroid dynamics,
and I am currently working on the validation and scientific
exploitation of the asteroid data for the future releases.
The aim of the talk is to give an overview of the Gaia mission, and
then to show why the celestial mechanic is a key aspect for the
mission: both in the validation of the data and in the contribution of
Gaia to asteroid orbit determination.