Gaia Celestial Reference Frame

The Gaia Celestial Reference Frame is a celestial reference frame based upon data from the Gaia mission, an optical reference frame used to establish positions within the International Celestial Reference System (ICRS). Such reference frames provide established positions of observable astronomical objects on which to base celestial coordinates of any observable object. The most recent version is Gaia-CRF3, based upon Gaia DR 3, previous Gaia-based versions termed the Gaia CRF and Gaia-CRF2, which supplanted the earlier Hipparcos Celestial Reference Frame (HCRF).