Joint astrometric solution of HIPPARCOS and Gaia

Author: Michalik Daniel   Lindegren Lennart   Hobbs David   Lammers Uwe  

Publisher: Edp Sciences

E-ISSN: 1432-0746|571|issue|A85-A85

ISSN: 0004-6361

Source: Astronomy & Astrophysics, Vol.571, Iss.issue, 2014-11, pp. : A85-A85

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Abstract

Context. The first release of astrometric data from Gaia is expected in 2016. It will contain the mean stellar positions and magnitudes from the first year of observations. For more than 100 000 stars in common with the Hipparcos Catalogue it will be possible to compute very accurate proper motions due to the time difference of about 24 years between the two missions. This Hundred Thousand Proper Motions (HTPM) project is planned to be part of the first release.