The Tycho - Gaia astrometric solution: How to get 2.5 million parallaxes with less than one year of Gaia data

Context. The first release of astrometric data from Gaia will contain the mean stellar positions and magnitudes from the first year of observations, and proper motions from the combination of Gaia data with Hipparcos prior information (HTPM). Aims. We study the potential of using the positions from...

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Veröffentlicht in:	Astronomy and astrophysics (Berlin) 2015-02, Vol.574, p.A115
Hauptverfasser:	Michalik, Daniel, Lindegren, Lennart, Hobbs, David
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Astrophysics Catalogues Consistency Estimates Feasibility Iterative solution Simulation
Online-Zugang:	Volltext
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