Gaia Data Release 2

@article{Mignard2018GaiaDR,
  title={Gaia Data Release 2},
  author={François Mignard and Sergei A. Klioner and Lennart Lindegren and J. Hernandez and Ulrich Bastian and Alex Bombrun},
  journal={Astronomy \& Astrophysics},
  year={2018}
}
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… 
Gaia Data Release 2
Context. Gaia Data Release 2 (Gaia DR2) contains results for 1693 million sources in the magnitude range 3 to 21 based on observations collected by the European Space Agency Gaia satellite during the
Gaia Data Release 2
Context. We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter
Probing the Properties of Gaia-CRF2 Quasars at the Faintest Magnitudes
Gaia data release 2 (DR2) provides the best non-rotating optical frame aligned with the radio frame (ICRF) thanks to the inclusion of about half-million quasars in the five-parameter astrometric
The bright reference frame of Gaia and VLBI observations of radio stars
The Gaia Celestial Reference Frame is defined by faint quasars, and it is assumed that the positions and proper motions of other sources are expressed in the same frame. For Gaia DR2, position
Gaia Data Release 2
Context. The second Gaia data release (DR2) contains very precise astrometric and photometric properties for more than one billion sources, astrophysical parameters for dozens of millions, radial
Systematics and accuracy of VLBI astrometry: A comparison with Gaia Data Release 2
TLDR
The ICRF3 S/X-band catalog shows improved accuracy and systematics at the level of noise floor, but the zonal errors in the X/Ka-band should be noted, especially in the context of comparisons of multi-frequency positions for individual sources.
The Gaia reference frame for bright sources examined using VLBI observations of radio stars
Positions and proper motions of Gaia sources are expressed in a reference frame that ideally should be non-rotating relative to distant extragalactic objects, coincident with the International
The properties of the quasars astrometric solution in Gaia DR2.
We aim to evaluate the properties of the quasars astrometric solution in the second release of Gaia Release 2 (Gaia DR2). Besides the QSOs from the AllWISE AGN catalog, we also cross match the QSOs
Revisiting astrometric parameters of quasars in Gaia-CRF2
Aims. In order to check the astrometric solution quality, dependences of parallaxes and proper motions on precision, reliability, and consistency of sample solutions are studied for the quasars in
A quantitative analysis of systematic differences in the positions and proper motions of Gaia DR2 with respect to VLBI
We have analysed the differences in positions of 9081 matched sources between the Gaia Data Release 2 (DR2) and very long baseline interferometry (VLBI) catalogues. The median position uncertainty
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Gaia Data Release 2
Context. Gaia Data Release 2 (Gaia DR2) contains results for 1693 million sources in the magnitude range 3 to 21 based on observations collected by the European Space Agency Gaia satellite during the
Gaia Data Release 2
Context. We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter
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