Gaia Data Release 2. The celestial reference frame (Gaia-CRF2)

@article{Mignard2018GaiaDR,
  title={Gaia Data Release 2. The celestial reference frame (Gaia-CRF2)},
  author={F. Mignard and S. Klioner and L. Lindegren and J. Hern{\'a}ndez and U. Bastian and A. Bombrun},
  journal={Astronomy and Astrophysics},
  year={2018},
  volume={616},
  pages={1-15}
}
Context. The second release of Gaia data (Gaia DR2) contains the astrometric parameters for more than half a million quasars. This set defines a kinematically non-rotating reference frame in the optical domain. A subset of these quasars have accurate VLBI positions that allow the axes of the reference frame to be aligned with the International Celestial Reference System (ICRF) radio frame. Aims: We describe the astrometric and photometric properties of the quasars that were selected to… Expand
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