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Astrometry by ground-based telescopes for the Gaia mission

Tanga, Paolo; Thuillot, William; Carry, Benoît +1 more

The space astrometry Gaia mission is operating since July 2014 (Gaia Collaboration; Brown, A. et al., 2016; Gaia Collaboration; Prusti, T et al., 2016). As planned, Gaia detects many moving objects in its fields of view during its scanning process of the sky. Several months were necessary to tune the different parameters for filtering these object…