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Tycho-Gaia and beyond - Why the first Gaia data release is special
  Astronomy and astrophysics

Wednesday 15 June 2016
from 13:00 to 14:00
at FB55
Speaker : Daniel Michalik (Lund University)
Abstract : Gaia produces a highly accurate astrometric map of galactic stars and other celestial objects. The requirements for a good astrometric solution for a star are not met in three situations: - in the early phases of the space mission, when the observations sample too short a time interval; - stars at the detection limit, which are not seen sufficiently often even throughout the full mission duration; - and transient objects, such as supernovae, which may be observed only for a short time. We invented methods to obtain sensible astrometric results in these scenarios through the combination of Gaia observations with prior information. The joint Tycho-Gaia Astrometric Solution (TGAS) and similar methods have been demonstrated in detailed simulations, and are now being used for the reduction of the first data reduction of Gaia. This gives the upcoming first data release a unique character.

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