VizieR Gaia DR2 Catalogue is the CDS version of data provided by the European Space Agency, 2018, Gaia DR2, Version 1.0. https://doi.org/10.5270/esa-ycsawu7
The second Gaia data release includes a five-parameter astrometric solution (positions on the sky, parallaxes, and proper motions - for more than 1.3 billion sources, radial velocities for 7.2 million
