Gaia Data Release 1 - Astrometry: one billion positions, two million proper motions and parallaxes

@article{Lindegren2016GaiaDR,
  title={Gaia Data Release 1 - Astrometry: one billion positions, two million proper motions and parallaxes},
  author={Lennart Lindegren and Uwe Lammers and Ulrich Bastian and J. I. Gonz'alez Hern'andez and Sergei A. Klioner and David Hobbs and Alex Bombrun and Daniel Michalik and Mercedes Ramos-lerate and Alexey G. Butkevich and Gabriele Comoretto and E. Joliet and Berry Holl and Alexander Hutton and Paul Parsons and H. Steidelmuller and Ummi Abbas and Martin Altmann and A. H. Andrei and Sonia Ant{\'o}n and Nuria Bach and Christophe Barache and Ugo Becciani and J{\'e}r{\^o}me Berthier and Luca Bianchi and Michael Biermann and Sandrine Bouquillon and G{\'e}raldine Bourda and T. Brusemeister and Beatrice Bucciarelli and Deborah Busonero and T. Carlucci and Javier Casta{\~n}eda and Patrick Charlot and Marcial Clotet and Mariateresa Crosta and Michael Davidson and Fernando de Felice and Ronald Drimmel and Claus Fabricius and A. Fienga and Francesca Figueras and Eduardo Miguel Gonz{\'a}lez Fraile and Mario Gai and Nora Garralda and R. Geyer and J. J. Gonz'alez-Vidal and R. Guerra and Nigel C. Hambly and Marcus Hauser and Stefan Jordan and Mario Gilberto Lattanzi and Helmut Lenhardt and Shi-long Liao and Wolfgang Loffler and Paul J. McMillan and François Mignard and Andr{\'e} Mora and Roberto Morbidelli and Jordi Portell and Alberto Riva and Maria Sarasso and I{\~n}aki Serraller and H. Siddiqui and Richard L. Smart and Alessandro Spagna and Ulrike Stampa and Iain A. Steele and François Taris and Jordi Torra and Wouter van Reeven and Alberto Vecchiato and Sven Zschocke and Jos H.J. de Bruijne and G. Gracia and Frederic Raison and Tim A. Lister and Jonathan M. Marchant and Rosario Messineo and Michael Soffel and J. J. Pereira Osorio and Anthony D. Torres and William O'Mullane},
  journal={Astronomy and Astrophysics},
  year={2016},
  volume={595}
}
Gaia Data Release 1 (Gaia DR1) contains astrometric results for more than 1 billion stars brighter than magnitude 20.7 based on observations collected by the Gaia satellite during the first 14 months of its operational phase. We give a brief overview of the astrometric content of the data release and of the model assumptions, data processing, and validation of the results. For stars in common with the Hipparcos and Tycho-2 catalogues, complete astrometric single-star solutions are obtained by… 

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