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Estimation of distortion on NEEMO system of telescopes

Birlan, M.; Nedelcu, D. A.; Trelia, M. +1 more

The article treats on astrometric measurements obtained using NEEMO system of telescopes and the improvement by applying a distortion model. Astrometric measurements for T05 show a stable value of residuals, independent of distortion model, while the measurements for T03 are improved by a factor three when use a quartic distortion model.

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…