Stephan Morgenthaler, Mikaël Martino, Shuangqing Liao
Context. The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry, the proper motion and parallax are calculated using Hipparcos and Tycho-2 po ...
Edp Sciences S A2017