Gaia Data Release 2. Summary of the contents and survey properties

Journal
Date Issued
2018
Author(s)
Gaia Collaboration
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Brown, A. G. A.
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Prusti, T.
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de Bruijne, J. H. J.
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Babusiaux, C.
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Bailer-Jones, C. A. L.
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Biermann, M.
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Evans, D. W.
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Eyer, L.
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Jansen, F.
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Moitinho, A.
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Mora, A.
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Muinonen, K.
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Osinde, J.
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Pauwels, T.
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Petit, J. -M.
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Recio-Blanco, A.
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Richards, P. J.
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Rimoldini, L.
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Jordi, C.
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Robin, A. C.
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Sarro, L. M.
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Siopis, C.
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Smith, M.
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Süveges, M.
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Torra, J.
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van Reeven, W.
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Abreu Aramburu, A.
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Klioner, S. A.
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Accart, S.
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Aerts, C.
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Álvarez, M. A.
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Alvarez, R.
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Alves, J.
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Anderson, R. I.
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Andrei, A. H.
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Anglada Varela, E.
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Antiche, E.
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Lammers, U.
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Antoja, T.
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Arcay, B.
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Astraatmadja, T. L.
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Bach, N.
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Baker, S. G.
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Balaguer-Núñez, L.
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Balm, P.
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Barache, C.
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Barata, C.
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Barbato, D.
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Lindegren, L.
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Barblan, F.
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Barklem, P. S.
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Barrado, D.
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Barros, M.
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Barstow, M. A.
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Bartholomé Muñoz, S.
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Bassilana, J. -L.
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Berihuete, A.
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Luri, X.
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Bianchi, L.
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Bienaymé, O.
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Blanco-Cuaresma, S.
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Boch, T.
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Bombrun, A.
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Borrachero, R.
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Bossini, D.
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Bouquillon, S.
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Mignard, F.
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Bourda, G.
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Bramante, L.
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Breddels, M. A.
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Bressan, A.
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Brouillet, N.
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Brüsemeister, T.
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Burlacu, A.
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Panem, C.
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Butkevich, A. G.
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Caffau, E.
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Cancelliere, R.
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Cannizzaro, G.
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Cantat-Gaudin, T.
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Carballo, R.
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Carlucci, T.
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Carrasco, J. M.
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Pourbaix, D.
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Casamiquela, L.
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Castro-Ginard, A.
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Charlot, P.
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Chemin, L.
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Chiavassa, A.
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Cocozza, G.
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Costigan, G.
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Cowell, S.
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Crifo, F.
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Crowley, C.
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Cuypers, J.
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Dafonte, C.
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Damerdji, Y.
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Dapergolas, A.
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David, P.
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David, M.
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de Laverny, P.
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Sartoretti, P.
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De March, R.
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de Souza, R.
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de Torres, A.
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Debosscher, J.
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del Pozo, E.
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Delbo, M.
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Delgado, A.
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Delgado, H. E.
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Di Matteo, P.
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Siddiqui, H. I.
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Diakite, S.
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Diener, C.
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Dolding, C.
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Drazinos, P.
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Durán, J.
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Edvardsson, B.
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Enke, H.
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Eriksson, K.
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Esquej, P.
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Soubiran, C.
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Eynard Bontemps, G.
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Fabre, C.
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Faigler, S.
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Falcão, A. J.
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Farràs Casas, M.
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Federici, L.
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Fedorets, G.
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Fernique, P.
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Figueras, F.
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van Leeuwen, F.
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Filippi, F.
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Findeisen, K.
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Fonti, A.
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Fraile, E.
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Fraser, M.
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Frézouls, B.
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Garabato, D.
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García-Sedano, F.
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Walton, N. A.
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Garralda, N.
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Gavel, A.
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Gavras, P.
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Gerssen, J.
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Geyer, R.
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Gilmore, G.
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Girona, S.
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Giuffrida, G.
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Arenou, F.
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Glass, F.
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Gomes, M.
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Granvik, M.
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Gueguen, A.
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Guerrier, A.
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Guiraud, J.
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Gutiérrez-Sánchez, R.
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Haigron, R.
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Hatzidimitriou, D.
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Hauser, M.
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Bastian, U.
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Haywood, M.
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Heiter, U.
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Helmi, A.
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Heu, J.
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Hilger, T.
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Hobbs, D.
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Hofmann, W.
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Holland, G.
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Huckle, H. E.
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Hypki, A.
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Cropper, M.
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Icardi, V.
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Janßen, K.
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Jevardat de Fombelle, G.
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Jonker, P. G.
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Juhász, Á. L.
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Julbe, F.
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Karampelas, A.
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Kewley, A.
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Klar, J.
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Kochoska, A.
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Kohley, R.
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Kolenberg, K.
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Kontizas, M.
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Kontizas, E.
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Koposov, S. E.
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Kordopatis, G.
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Kostrzewa-Rutkowska, Z.
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Koubsky, P.
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Lambert, S.
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Katz, D.
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Lasne, Y.
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Lavigne, J. -B.
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Le Fustec, Y.
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Le Poncin-Lafitte, C.
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Lebreton, Y.
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Leclerc, N.
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Lecoeur-Taibi, I.
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Lenhardt, H.
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Leroux, F.
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Liao, S.
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Lindstrøm, H. E. P.
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Lister, T. A.
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Livanou, E.
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Lobel, A.
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López, M.
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Managau, S.
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Mann, R. G.
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Mantelet, G.
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Bakker, J.
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Marchal, O.
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Marchant, J. M.
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Marschalkó, G.
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Marshall, D. J.
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Martino, M.
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Marton, G.
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Mary, N.
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Cacciari, C.
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Matijevič, G.
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Mazeh, T.
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McMillan, P. J.
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Michalik, D.
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Millar, N. R.
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Molina, D.
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Molnár, L.
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Castañeda, J.
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Mor, R.
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Morel, T.
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Morris, D.
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Mulone, A. F.
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Nelemans, G.
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Noval, L.
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Chaoul, L.
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O'Mullane, W.
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Ordénovic, C.
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Ordóñez-Blanco, D.
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Osborne, P.
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Pagani, C.
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Pailler, F.
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Palacin, H.
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Palaversa, L.
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Panahi, A.
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Cheek, N.
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Pawlak, M.
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Pineau, F. -X.
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Plachy, E.
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Plum, G.
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Poujoulet, E.
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Prša, A.
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Racero, E.
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De Angeli, F.
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Ragaini, S.
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Rambaux, N.
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Ramos-Lerate, M.
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Regibo, S.
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Reylé, C.
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Riclet, F.
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Rivard, A.
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Rixon, G.
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Fabricius, C.
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Roegiers, T.
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Roelens, M.
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Romero-Gómez, M.
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Rowell, N.
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Royer, F.
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Ruiz-Dern, L.
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Sadowski, G.
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Sagristà Sellés, T.
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Sahlmann, J.
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Salgado, J.
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Guerra, R.
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Salguero, E.
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Santana-Ros, T.
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Savietto, H.
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Schultheis, M.
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Segol, M.
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Segovia, J. C.
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Ségransan, D.
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Holl, B.
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Shih, I. -C.
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Siltala, L.
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Silva, A. F.
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Smith, K. W.
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Solano, E.
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Solitro, F.
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Soria Nieto, S.
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Souchay, J.
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Masana, E.
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Spoto, F.
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Stampa, U.
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Steele, I. A.
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Steidelmüller, H.
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Stephenson, C. A.
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Stoev, H.
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Suess, F. F.
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Surdej, J.
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Szabados, L.
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Messineo, R.
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Szegedi-Elek, E.
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Tapiador, D.
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Taris, F.
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Tauran, G.
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Taylor, M. B.
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Teixeira, R.
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Terrett, D.
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Teyssandier, P.
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Thuillot, W.
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Titarenko, A.
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Mowlavi, N.
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Torra Clotet, F.
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Turon, C.
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Ulla, A.
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Utrilla, E.
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Uzzi, S.
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Vaillant, M.
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Valette, V.
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van Elteren, A.
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Van Hemelryck, E.
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Nienartowicz, K.
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van Leeuwen, M.
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Vaschetto, M.
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Veljanoski, J.
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Viala, Y.
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Vicente, D.
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Vogt, S.
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von Essen, C.
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Voss, H.
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Votruba, V.
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Panuzzo, P.
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Voutsinas, S.
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Walmsley, G.
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Weiler, M.
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Wertz, O.
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Wevers, T.
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Wyrzykowski, Ł.
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Yoldas, A.
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Žerjal, M.
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Ziaeepour, H.
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Zorec, J.
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Portell, J.
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Zschocke, S.
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Zucker, S.
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Zurbach, C.
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Zwitter, T.
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Riello, M.
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Seabroke, G. M.
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Tanga, P.
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Thévenin, F.
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Gracia-Abril, G.
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Garcia-Reinaldos, M.
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Teyssier, D.
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Altmann, M.
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Andrae, R.
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Audard, M.
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Bellas-Velidis, I.
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Benson, K.
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Berthier, J.
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Blomme, R.
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Burgess, P.
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Busso, G.
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Carry, B.
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Clotet, M.
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Creevey, O.
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Davidson, M.
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De Ridder, J.
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Delchambre, L.
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Ducourant, C.
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Fernández-Hernández, J.
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Fouesneau, M.
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Frémat, Y.
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Galluccio, L.
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García-Torres, M.
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González-Núñez, J.
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González-Vidal, J. J.
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Gosset, E.
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Guy, L. P.
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Halbwachs, J. -L.
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Hambly, N. C.
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Harrison, D. L.
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Hernández, J.
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Hestroffer, D.
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Hodgkin, S. T.
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Hutton, A.
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Jasniewicz, G.
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Jean-Antoine-Piccolo, A.
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Jordan, S.
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Korn, A. J.
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Krone-Martins, A.
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Lebzelter, T.
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Löffler, W.
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Manteiga, M.
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Martín-Fleitas, J. M.
DOI
Abstract
Context. We present the second Gaia data release, Gaia DR2, consisting of astrometry, photometry, radial velocities, and information on astrophysical parameters and variability, for sources brighter than magnitude 21. In addition epoch astrometry and photometry are provided for a modest sample of minor planets in the solar system.
Aims: A summary of the contents of Gaia DR2 is presented, accompanied by a discussion on the differences with respect to Gaia DR1 and an overview of the main limitations which are still present in the survey. Recommendations are made on the responsible use of Gaia DR2 results.
Methods: The raw data collected with the Gaia instruments during the first 22 months of the mission have been processed by the Gaia Data Processing and Analysis Consortium (DPAC) and turned into this second data release, which represents a major advance with respect to Gaia DR1 in terms of completeness, performance, and richness of the data products.
Results: Gaia DR2 contains celestial positions and the apparent brightness in G for approximately 1.7 billion sources. For 1.3 billion of those sources, parallaxes and proper motions are in addition available. The sample of sources for which variability information is provided is expanded to 0.5 million stars. This data release contains four new elements: broad-band colour information in the form of the apparent brightness in the GBP (330-680 nm) and GRP (630-1050 nm) bands is available for 1.4 billion sources; median radial velocities for some 7 million sources are presented; for between 77 and 161 million sources estimates are provided of the stellar effective temperature, extinction, reddening, and radius and luminosity; and for a pre-selected list of 14 000 minor planets in the solar system epoch astrometry and photometry are presented. Finally, Gaia DR2 also represents a new materialisation of the celestial reference frame in the optical, the Gaia-CRF2, which is the first optical reference frame based solely on extragalactic sources. There are notable changes in the photometric system and the catalogue source list with respect to Gaia DR1, and we stress the need to consider the two data releases as independent.
Conclusions: Gaia DR2 represents a major achievement for the Gaia mission, delivering on the long standing promise to provide parallaxes and proper motions for over 1 billion stars, and representing a first step in the availability of complementary radial velocity and source astrophysical information for a sample of stars in the Gaia survey which covers a very substantial fraction of the volume of our galaxy.
Volume
616
Start page
A1
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2018A&A...616A...1G
Rights
open.access
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