Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects
Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects
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 positions in 1991.25 as prior information. Aims. We investigate the scientific …