Three science instruments allow for accurate determination of stellar positions and velocities as well as the spectral properties. Gaia revolves about its axis slowly in about six hours and is composed of two optical space telescopes. The data helps unveil the origin and future evolution of the Solar System and the Milky Way and helps understand stellar and planetary-system evolution and our place in the cosmos. Gaia data allows, for example, for the derivation of asteroid and exoplanet orbits and physical properties. Finnish researchers were strongly involved in the release. On Monday, June 13, ESA released Gaia data in Data Release 3 (DR3). Gaia was launched in December 2013 and has collected science data from July 2014. The Gaia space mission of the European Space Agency ESA is constructing an ultraprecise three-dimensional map of our Milky Way galaxy, observing almost two billion stars or roughly one percent of all the stars in our galaxy. The Gaia Data Release 3 on Monday revolutionizes our knowledge of the Solar System and the Milky Way and its satellite galaxies. The European Gaia space mission has produced an unprecedented amount of new, improved, and detailed data for almost two billion objects in the Milky Way galaxy and the surrounding cosmos. view moreД¬redit: Reference and image credit: Siltala, L. The combination of ground-based and Gaia data provides the most accurate estimate for Edna's mass and the low density suggest that its carbonaceous interior has not been fully compacted.

Image:В Mass estimate for main-belt asteroid (445) Edna based on ground-based astrometry (blue), Gaia DR2 astrometry (red), and their combination (green).

Radial velocity astrometry