Gaia Data Release 1 Open cluster astrometry: performance, limitations, and future prospects

F. van Leeuwen, A. Vallenari, C Jordi, L. Lindegren, U. Bastian, T. Prusti, JHJ de Brujne, Andrew G. Brown, C. Babusiaux, CAL Bailer-Jones, M. Biermann, D.W. Evans, L. Eyer, Jens Kirkeskov Knude, H.E.P. Lindstrøm