We perform lightcurve inversion for 491 asteroids to retrieve phase curve parameters, rotation periods, pole longitudes and latitudes, and convex and triaxial ellipsoid shapes by using the sparse photometric observations from Gaia Data Release 2 and the dense ground-based observations from the DAMIT data base. We develop a method for the derivation of reference absolute magnitudes and phase curves from the Gaia data, allowing for comparative studies among hundreds of asteroids.