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Geraldine Bourda
Type of contribution: oral

Aligning VLBI and Gaia Extragalactic Celestial Reference Frames

G'eraldine Bourda, Laboratoire d’Astrophysique de Bordeaux Patrick Charlot, Laboratoire d’Astrophysique de Bordeaux Arnaud Collioud, Laboratoire d’Astrophysique de Bordeaux

By 2020, two extragalactic celestial reference frames will coexist: the VLBI frame currently adopted by the IAU as the fundamental one and the Gaia frame determined from direct optical observations of quasars by this satellite. Aligning them with the highest accuracy will be important for consistency between optical and radio positions of any celestial targets. In this paper, we will discuss the selection of the VLBI-Gaia transfer sources, present the various initiatives to reach this goal, review the status of the projects and draw plans for the future.