Gaia Data Release 1: Summary of the astrometric, photometric, and survey properties

  1. Brown, A.G.A. 110
  2. Vallenari, A. 78
  3. Prusti, T. 55
  4. De Bruijne, J.H.J. 55
  5. Mignard, F. 105
  6. Drimmel, R. 75
  7. Babusiaux, C. 63
  8. Bailer-Jones, C.A.L. 113
  9. Bastian, U. 12
  10. Biermann, M. 12
  11. Evans, D.W. 89
  12. Eyer, L. 28
  13. Jansen, F. 116
  14. Jordi, C. 86
  15. Katz, D. 63
  16. Klioner, S.A. 111
  17. Lammers, U. 54
  18. Lindegren, L. 112
  19. Luri, X. 86
  20. O'Mullane, W. 54
  21. Panem, C. 21
  22. Pourbaix, D. 83
  23. Randich, S. 73
  24. Sartoretti, P. 63
  25. Siddiqui, H.I. 54
  26. Soubiran, C. 102
  27. Valette, V. 21
  28. Van Leeuwen, F. 89
  29. Walton, N.A. 89
  30. Aerts, C. 96
  31. Arenou, F. 63
  32. Cropper, M. 117
  33. Høg, E. 121
  34. Lattanzi, M.G. 75
  35. Grebel, E.K. 12
  36. Holland, A.D. 20
  37. Huc, C. 21
  38. Passot, X. 21
  39. Perryman, M. 55
  40. González-Marcos, Ana. 32
  41. A. Bello García 157
  42. Gallegos, J. 54
  43. Erakutsi egile guztiak +
  1. 1 Airbus Defence and Space SAS, 31 Rue des Cosmonautes, Toulouse Cedex 4, France
  2. 2 AKKA for CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, France
  3. 3 ALTEC S.p.a, Corso Marche, 79, Torino, Italy
  4. 4 APAVE SUDEUROPE SAS, CNES, Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, France
  5. 5 Applied Physics Department, University of Vigo, Vigo, Spain
  6. 6 Área de Lenguajes y Sistemas Informáticos, Universidad Pablo de Olavide, Ctra. de Utrera, km 1, Sevilla, Spain
  7. 7 Argelander Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, Bonn, Germany
  8. 8 ASI Science Data Center, via del Politecnico SNC, Roma, Italy
  9. 9 Astronomical Institute, Academy of Sciences of the Czech Republic, Fričova 298, Ondřejov, Czech Republic
  10. 10 Astronomical Institute Anton Pannekoek, University of Amsterdam, PO Box 94249, Amsterdam, Netherlands
  11. 11 Astronomical Observatory Institute, Faculty of Physics, A. Mickiewicz University, ul. S.oneczna 36, Poznañ, Poland
  12. 12 Heidelberg University
    info

    Heidelberg University

    Heidelberg, Alemania

    ROR https://ror.org/038t36y30

  13. 13 Astrophysics Research Institute, Liverpool John Moores University, United Kingdom
  14. 14 ATOS for CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, France
  15. 15 Aurora Technology for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Cañada, Madrid, Spain
  16. 16 Baja Observatory of University of Szeged, Szegedi út III/70, Baja, Hungary
  17. 17 Barcelona Supercomputing Center - Centro Nacional de Supercomputacion, c/ Jordi Girona 29, Ed. Nexus II, Barcelona, Spain
  18. 18 Center of Applied Space Technology and Microgravity (ZARM), c/o Universität Bremen, Am Fallturm 1, Bremen, Germany
  19. 19 CENTRA, Universidade de Lisboa, FCUL, Campo Grande, Lisboa, Portugal
  20. 20 Centre for Electronic Imaging, Department of Physical Sciences, Open University, Walton Hall, Milton Keynes, United Kingdom
  21. 21 Centre National D'Etudes Spatiales
    info

    Centre National D'Etudes Spatiales

    París, Francia

    ROR https://ror.org/04h1h0y33

  22. 22 Consorci de Serveis Universitaris de Catalunya, C/ Gran Capita, 2-4, Barcelona, Spain
  23. 23 CRAAG-Centre de Recherche en Astronomie, Astrophysique et Geophysique, Route de l'Observatoire, BP 63 Bouzareah, Alger, Algeria
  24. 24 CSC Danmark A/S, Retortvej 8, Valby, Denmark
  25. 25 CS Systemes d'Information for CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, France
  26. 26 Departamento de Astrofisica, Centro de Astrobiologia (CSICINTA), ESA-ESAC, Camino Bajo del Castillo s/n, Villanueva de la Canada, Madrid, Spain
  27. 27 Department of Astronomy, University of Geneva, Chemin d'Ecogia 16, Versoix, Switzerland
  28. 28 Université de Genève
    info

    Université de Genève

    Ginebra, Suiza

    ROR https://ror.org/01swzsf04

  29. 29 Department of Astrophysics, Astronomy and Mechanics, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, Athens, Greece
  30. 30 Department of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, Nijmegen, Netherlands
  31. 31 Department of Geosciences, Tel Aviv University, Tel Aviv, Israel
  32. 32 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

  33. 33 Department of Physics, Florida International University, 11200 SW 8th Street, Miami, FL, United States
  34. 34 Department of Physics and Astronomy, Division of Astronomy and Space Physics, Uppsala University, Box 516, Uppsala, Sweden
  35. 35 Department of Physics and Astronomy, Johns Hopkins University, 3400 N Charles St, Baltimore, MD, United States
  36. 36 Department of Physics and Astronomy, Notre Dame University, Louaize, PO Box 72, Zouk Mikaël, Lebanon
  37. 37 Department of Physics and Astronomy, University of Leicester, University Road, Leicester, United Kingdom
  38. 38 Department of Physics and Astronomy, University of Padova, via Marzolo 8, Padova, Italy
  39. 39 Department of Physics and Astronomy, University of the Western Cape, Robert Sobukwe Road, Bellville, Cape Town, South Africa
  40. 40 Department of Space Studies, Southwest Research Institute (SwRI), 1050 Walnut Street, Boulder, CO, United States
  41. 41 Deutsches Zentrum fur Luft- und Raumfahrt, Institute of Space Systems, Am Fallturm 1, Bremen, Germany
  42. 42 Dipartimento di Fisica, Universita di Roma Tor Vergata, via della Ricerca Scientifica 1, Rome, Italy
  43. 43 Direcs of Science, European Space Research and Technology Centre (ESA/ESTEC), Keplerlaan 1, Noordwijk, Netherlands
  44. 44 Dpto. Arquitectura de Computadores y Automática, Facultad de Informática, Universidad Complutense de Madrid, C/ Prof. José García Santesmases s/n, Madrid, Spain
  45. 45 Dpto. de Inteligencia Artificial, UNED, c/ Juan del Rosal 16, Madrid, Spain
  46. 46 École Polytechnique Fédérale de Lausanne, SB MATHAA STAP, MAB1 473 (Bâtiment MA), Station 8, Lausanne, Switzerland
  47. 47 EJR-Quartz BV for ESA/ESTEC, Keplerlaan 1, Noordwijk, Netherlands
  48. 48 Elecnor Deimos Space for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Cañada, Madrid, Spain
  49. 49 EQUERT International for CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, France
  50. 50 ETSE Telecomunicación, Universidade de Vigo, Campus Lagoas-Marcosende, Vigo, Galicia, Spain
  51. 51 EURIX S.r.l., via Carcano 26, Torino, Italy
  52. 52 European Southern Observatory (ESO), Alonso de Córdova 3107, Vitacura, Casilla, Santiago de Chile, Chile
  53. 53 European Southern Observatory (ESO), Karl-Schwarzschild-Straße 2, Garching bei München, Germany
  54. 54 Centro Europeo de Astronomía Espacial
    info

    Centro Europeo de Astronomía Espacial

    Villanueva de la Cañada, España

  55. 55 European Space Research and Technology CentreScientific Support Office, Direcs of Science, European Space Research and Technology Centre (ESA/ESTEC), Keplerlaan 1, Noordwijk, Netherlands
  56. 56 F.R.S.-FNRS, Rue d'Egmont 5, Brussels, Belgium
  57. 57 Faculdade Ciencias, Universidade do Porto, Departamento Matematica Aplicada, Rua do Campo Alegre, 687, Porto, Portugal
  58. 58 Faculty of Mathematics and Physics, University of Ljubljana, Jadranska ulica 19, Ljubljana, Slovenia
  59. 59 Finnish Geospatial Research Institute FGI, Geodeetinrinne 2, Masala, Finland
  60. 60 Fork Research, Rua do Cruzado Osberno, Lt. 1, 9 esq., Lisboa, Portugal
  61. 61 Fundación Galileo Galilei, INAF, Rambla José Ana Fernández Pérez 7, Breña Baja, Santa Cruz de Tenerife, Spain
  62. 62 Gaia DPAC Project Office, ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Cañada, Madrid, Spain
  63. 63 Université Denis Diderot
    info

    Université Denis Diderot

    París, Francia

  64. 64 GMV for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Canada, Madrid, Spain
  65. 65 Hamburger Sternwarte, Gojenbergsweg 112, Hamburg, Germany
  66. 66 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA, United States
  67. 67 HE Space Operations BV for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Cañada, Madrid, Spain
  68. 68 HE Space Operations BV for ESA/ESTEC, Keplerlaan 1, Noordwijk, Netherlands
  69. 69 H H Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, United Kingdom
  70. 70 IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Lille, 77 av. Denfert-Rochereau, Paris, France
  71. 71 INAF, Istituto di Radioastronomia, via Gobetti 101, Bologna, Italy
  72. 72 INAF/IASF-Bologna, via P. Gobetti 101, Bologna, Italy
  73. 73 INAF-Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, Firenze, Italy
  74. 74 INAF-Osservatorio Astrofisico di Catania, via S. Sofia 78, Catania, Italy
  75. 75 Osservatorio Astrofisico di Torino
    info

    Osservatorio Astrofisico di Torino

    Pino Torinese, Italia

    ROR https://ror.org/00yrf4e35

  76. 76 Osservatorio Astronomico di Bologna
    info

    Osservatorio Astronomico di Bologna

    Bolonia, Italia

    ROR https://ror.org/002hc6y19

  77. 77 INAF-Osservatorio Astronomico di Capodimonte, via Moiariello 16, Napoli, Italy
  78. 78 Osservatorio Astronomico di Padova
    info

    Osservatorio Astronomico di Padova

    Padua, Italia

    ROR https://ror.org/04z3y3f62

  79. 79 INAF-Osservatorio Astronomico di Roma, via di Frascati 33, Monte Porzio Catone (Roma), Italy
  80. 80 INAF-Osservatorio Astronomico di Teramo, via Mentore Maggini, Teramo, Italy
  81. 81 INAF-Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, Trieste, Italy
  82. 82 INSA for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Cañada, Madrid, Spain
  83. 83 Université Libre de Bruxelles
    info

    Université Libre de Bruxelles

    Bruselas, Bélgica

    ROR https://ror.org/01r9htc13

  84. 84 Institut d'Astrophysique et de Géophysique, Université de Liège, 19c, Allée du 6 Août, Liège, Belgium
  85. 85 Institut d'Astrophysique Spatiale, Université Paris XI, UMR 8617, CNRS, Orsay Cedex, France
  86. 86 Universitat de Barcelona
    info

    Universitat de Barcelona

    Barcelona, España

    ROR https://ror.org/021018s57

  87. 87 Institut de Physique de Rennes, Université de Rennes 1, Rennes, France
  88. 88 Institute for Astronomy, Royal Observatory, University of Edinburgh, Blackford Hill, Edinburgh, United Kingdom
  89. 89 University of Cambridge
    info

    University of Cambridge

    Cambridge, Reino Unido

    ROR https://ror.org/013meh722

  90. 90 Institute of Theoretical Physics and Astronomy, Vilnius University, Sauletekio al. 3, Vilnius, Lithuania
  91. 91 Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain
  92. 92 Instituto de Astrofisica e Ciencias do Espaco, Universidade de Lisboa Faculdade de Ciencias, Campo Grande, Lisboa, Portugal
  93. 93 Instituto de Astronomia, Geofisica e Ciencias Atmosfericas, Universidade de Sao Paulo, Rua do Matao, 1226 Cidade Universitaria, Sao Paulo, SP, Brazil
  94. 94 Instituto Nacional de Pesquisas Espaciais, Ministério da Ciencia Tecnologia, Avenida dos Astronautas 1758, São José Dos Campos, Brazil
  95. 95 Institut UTINAM, UMR6213, CNRS, OSU THETA Franche-Comté Bourgogne, Université Bourgogne Franche-Comté, Besançon, France
  96. 96 Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, Leuven, Belgium
  97. 97 Isdefe for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Cañada, Madrid, Spain
  98. 98 Kapteyn Astronomical Institute, University of Groningen, Landleven 12, Groningen, Netherlands
  99. 99 Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge, United Kingdom
  100. 100 Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17, Budapest, Hungary
  101. 101 Laboratoire AIM, IRFU, Service d'Astrophysique, CEA/DSM, CNRS, Université Paris Diderot, CEA-Saclay, Gif-sur-Yvette Cedex, France
  102. 102 University of Bordeaux
    info

    University of Bordeaux

    Burdeos, Francia

    ROR https://ror.org/057qpr032

  103. 103 Laboratoire de l'Accélérateur Linéaire, Université Paris-Sud, CNRS, IN2P3, Université Paris-Saclay, Orsay Cedex, France
  104. 104 Laboratoire Geoazur, Universite Nice Sophia-Antipolis, UMR 7329, CNRS, Observatoire de la Cote d'Azur, 250 rue A. Einstein, Valbonne, France
  105. 105 Nice Sophia Antipolis University
    info

    Nice Sophia Antipolis University

    Niza, Francia

  106. 106 Laboratoire Univers et Particules de Montpellier, Université Montpellier, Place Eugène Bataillon, CC72, Montpellier Cedex 05, France
  107. 107 Laboratory of Optics, Lasers and Systems, Faculty of Sciences, University of Lisbon, Campus do Lumiar, Estrada do Paço do Lumiar, 22, Lisboa, Portugal
  108. 108 Las Cumbres Observatory Global Telescope Network, Inc., 6740 Cortona Drive, Goleta, CA, United States
  109. 109 Leibniz Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, Potsdam, Germany
  110. 110 Leiden University
    info

    Leiden University

    Leiden, Holanda

    ROR https://ror.org/027bh9e22

  111. 111 Dresden University of Technology
    info

    Dresden University of Technology

    Dresde, Alemania

    ROR https://ror.org/042aqky30

  112. 112 Lund University
    info

    Lund University

    Lund, Suecia

    ROR https://ror.org/012a77v79

  113. 113 Max Planck Institute for Astronomy
    info

    Max Planck Institute for Astronomy

    Heidelberg, Alemania

    ROR https://ror.org/01vhnrs90

  114. 114 Max Planck Institute for Extraterrestrial Physics, OPINAS, Gießenbachstraße, Garching, Germany
  115. 115 Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, Göttingen, Germany
  116. 116 European Space Research and Technology Centre
    info

    European Space Research and Technology Centre

    Noordwijk-Binnen, Holanda

    ROR https://ror.org/03h3jqn23

  117. 117 University College London
    info

    University College London

    Londres, Reino Unido

    ROR https://ror.org/02jx3x895

  118. 118 NASA/IPAC Infrared Science Archive, California Institute of Technology, Mail Code 100-22, 770 South Wilson Avenue, Pasadena, CA, United States
  119. 119 National Astronomical Observatories, CAS, Beijing, China
  120. 120 National Observatory of Athens, I. Metaxa and Vas. Pavlou, Palaia Penteli, Athens, Greece
  121. 121 University of Copenhagen
    info

    University of Copenhagen

    Copenhague, Dinamarca

    ROR https://ror.org/035b05819

  122. 122 Observatoire Astronomique de Strasbourg, Université de Strasbourg, CNRS, UMR 7550, 11 rue de l'Université, Strasbourg, France
  123. 123 ON/MCTI-BR, Rua Gal. Jose Cristino 77, Rio de Janeiro, RJ, Brazil
  124. 124 OV/UFRJ-BR, Ladeira Pedro Antonio 43, Rio de Janeiro, RJ, Brazil
  125. 125 Physics Department, University of Antwerp, Groenenborgerlaan 171, Antwerp, Belgium
  126. 126 Praesepe BV for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Canada, Madrid, Spain
  127. 127 RHEA for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Canada, Madrid, Spain
  128. 128 RHEA for ESA/ESTEC, Keplerlaan 1, Noordwijk, Netherlands
  129. 129 RHEA System for ESA/ESOC, Robert Bosch Straße 5, Darmstadt, Germany
  130. 130 Royal Observatory of Belgium, Ringlaan 3, Brussels, Belgium
  131. 131 S and T Corporation, PO Box 608, Delft, Netherlands
  132. 132 School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
  133. 133 Serco Gestión de Negocios for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Cañada, Madrid, Spain
  134. 134 Server Labs for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Canada, Madrid, Spain
  135. 135 Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Rd, Shanghai, China
  136. 136 SISSA (Scuola Internazionale Superiore di Studi Avanzati), via Bonomea 265, Trieste, Italy
  137. 137 Slovak Organisation for Space Activities, Zamocka 18, Bratislava, Slovakia
  138. 138 Sorbonne Universites UPMC, CNRS, UMR7095, Institut d'Astrophysique de Paris, Paris, France
  139. 139 Spanish Virtual Observatory, Spain
  140. 140 SRON, Netherlands Institute for Space Research, Sorbonnelaan 2, Utrecht, Netherlands
  141. 141 Stellar Astrophysics Centre, Aarhus University, Department of Physics and Astronomy, 120 Ny Munkegade, Aarhus C, Denmark
  142. 142 STFC, Rutherford Appleton Laboratory, Harwell, Didcot, United Kingdom
  143. 143 Sydney Institute for Astronomy, School of Physics, University of SydneyNSW, Australia
  144. 144 SYRTE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, LNE, 61 avenue de l'Observatoire, Paris, France
  145. 145 Tartu Observatory, Tõravere, Estonia
  146. 146 Technical University of Madrid, José Gutiérrez Abascal 2, Madrid, Spain
  147. 147 Thales Services for CNES Centre Spatial de Toulouse, 18 avenue Edouard Belin, Toulouse Cedex 9, France
  148. 148 UNINOVA, CTS, Campus FCT-UNL, Monte da Caparica, Caparica, Portugal
  149. 149 Universidad de La Laguna, Departamento de Astrofísica, La Laguna, Tenerife, Spain
  150. 150 Universidade da Coruña, Facultade de Informática, Campus de Elviña S/N, A Coruña, Spain
  151. 151 Università di Catania, Dipartimento di Fisica e Astronomia, Sezione Astrofisica, via S. Sofia 78, Catania, Italy
  152. 152 Universiteit Antwerpen, Onderzoeksgroep Toegepaste Wiskunde, Middelheimlaan 1, Antwerpen, Belgium
  153. 153 University of Applied Sciences Munich, Karlstr. 6, Munich, Germany
  154. 154 University of Cadiz, Avd. De la universidad, Jerez de la Frontera, Cadiz, Spain
  155. 155 University of Helsinki, Department of Physics, PO Box 64, University of Helsinki, Finland
  156. 156 University of Nova Gorica, Vipavska 13, Nova Gorica, Slovenia
  157. 157 Universidad de Oviedo
    info

    Universidad de Oviedo

    Oviedo, España

    ROR https://ror.org/006gksa02

  158. 158 University of Turin, Department of Computer Sciences, Corso Svizzera 185, Torino, Italy
  159. 159 University of Vienna, Department of Astrophysics, Turkenschanzstrase 17, Vienna, Austria
  160. 160 US Naval Observatory, Astrometry Department, 3450 Massachusetts Ave. NW, Washington, DC, United States
  161. 161 Villanova University, Dept. of Astrophysics and Planetary Science, 800 E Lancaster Ave, Villanova, PA, United States
  162. 162 Vitrociset Belgium for ESA/ESAC, Camino bajo del Castillo, Urb. Villafranca del Castillo, Villanueva de la Cañada, Madrid, Spain
  163. 163 Warsaw University Observatory, Al. Ujazdowskie 4, Warszawa, Poland
Erakutsi afiliazioak +
Aldizkaria:
Astronomy and astrophysics

ISSN: 0004-6361

Argitalpen urtea: 2016

Alea: 595

Zenbakia: 1

Mota: Artikulua

beta Ver similares en nube de resultados
DOI: 10.1051/0004-6361/201629512 SCOPUS: 2-s2.0-84998772012 WoS: WOS:000388573500136 GOOGLE SCHOLAR lock_openSarbide irekia editor

Beste argitalpen batzuk: Astronomy and astrophysics

Gordailu instituzionala: lock_openSarbide irekia Editor

Laburpena

Context. At about 1000 days after the launch of Gaia we present the first Gaia data release, Gaia DR1, consisting of astrometry and photometry for over 1 billion sources brighter than magnitude 20.7. Aims. A summary of Gaia DR1 is presented along with illustrations of the scientific quality of the data, followed by a discussion of the limitations due to the preliminary nature of this release. Methods. The raw data collected by Gaia during the first 14 months of the mission have been processed by the Gaia Data Processing and Analysis Consortium (DPAC) and turned into an astrometric and photometric catalogue. Results. Gaia DR1 consists of three components: a primary astrometric data set which contains the positions, parallaxes, and mean proper motions for about 2 million of the brightest stars in common with the Hipparcos and Tycho-2 catalogues - a realisation of the Tycho-Gaia Astrometric Solution (TGAS) - and a secondary astrometric data set containing the positions for an additional 1.1 billion sources. The second component is the photometric data set, consisting of mean G-band magnitudes for all sources. The G-band light curves and the characteristics of ∼3000 Cepheid and RR Lyrae stars, observed at high cadence around the south ecliptic pole, form the third component. For the primary astrometric data set the typical uncertainty is about 0.3 mas for the positions and parallaxes, and about 1 mas yr-1 for the proper motions. A systematic component of ∼0.3 mas should be added to the parallax uncertainties. For the subset of ∼94 000 Hipparcos stars in the primary data set, the proper motions are much more precise at about 0.06 mas yr-1. For the secondary astrometric data set, the typical uncertainty of the positions is ∼10 mas. The median uncertainties on the mean G-band magnitudes range from the mmag level to ∼0.03 mag over the magnitude range 5 to 20.7. Conclusions. Gaia DR1 is an important milestone ahead of the next Gaia data release, which will feature five-parameter astrometry for all sources. Extensive validation shows that Gaia DR1 represents a major advance in the mapping of the heavens and the availability of basic stellar data that underpin observational astrophysics. Nevertheless, the very preliminary nature of this first Gaia data release does lead to a number of important limitations to the data quality which should be carefully considered before drawing conclusions from the data. © ESO, 2016.

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