- 1.7B sources with celestial positions and the apparent brightness in G
- Of these, 1.3B have parallaxes and proper motions
- 0.5M stars have variability information
- Compared to DR1, DR2 has 4 new broad-band colour information:
- apparent brightness in the GBP (330–680 nm) and GRP (630–1050 nm) bands is available for 1.4 billion sources;
- median radial velocities for some 7 million sources are presented;
- for between 77 and 161 million sources estimates are provided of the stellar effective temperature, extinction, reddening, and radius and luminosity; and
- for a pre-selected list of 14 000 minor planets in the solar system epoch astrometry and photometry are presented.
- The celestial reference frame in the optical, the Gaia-CRF2, solely on extragalactic sources.