Title: The second Gaia data release : content and first scientific results
Abstract: The second Gaia data release (DR2) has been published on 25 April 2018. It contains the parallaxes and proper motions of 1.3 billion sources (versus 2 millions in DR1) as well as the positions and G-magnitudes of 400 millions additional sources. DR2 also contains new products, including Bp/Rp-magnitudes of 1.4 billion sources, 7.2 millions line-of-sight velocities, stellar parameters for several tens millions stars, the detection of half a million variable stars and 14000 asteroids. In this seminar, I will detail the contents and performances of the release, discuss the usage of the data and I will present some of the first scientific results.