author        = "Gaia Collaboration and Mignard, F. and Klioner, S. A. and
                       Lindegren, L. and Hernández, J. and Bastian, U. and
                       Bombrun, A. and Hobbs, D. and Lammers, U. and Michalik, D.
                       and Ramos-Lerate, M. and Biermann, M. and
                       Fernández-Hernández, J. and Geyer, R. and Hilger, T. and
                       Siddiqui, H. I. and Steidelmüller, H. and Babusiaux, C.
                       and Barache, C. and Lambert, S. and Andrei, A. H. and
                       Bourda, G. and Charlot, P. and Brown, A. G. A. and
                       Vallenari, A. and Prusti, T. and de Bruijne, J. H. J. and
                       Bailer-Jones, C. A. L. and Evans, D. W. and Eyer, L. and
                       Jansen, F. and Jordi, C. and Luri, X. and Panem, C. and
                       Pourbaix, D. and Randich, S. and Sartoretti, P. and
                       Soubiran, C. and van Leeuwen, F. and Walton, N. A. and
                       Arenou, F. and Cropper, M. and Drimmel, R. and Katz, D. and
                       Lattanzi, M. G. and Bakker, J. and Cacciari, C. and
                       Castañeda, J. and Chaoul, L. and Cheek, N. and De Angeli,
                       F. and Fabricius, C. and Guerra, R. and Holl, B. and
                       Masana, E. and Messineo, R. and Mowlavi, N. and
                       Nienartowicz, K. and Panuzzo, P. and Portell, J. and
                       Riello, M. and Seabroke, G. M. and Tanga, P. and Thévenin,
                       F. and Gracia-Abril, G. and Comoretto, G. and
                       Garcia-Reinaldos, M. and Teyssier, D. and Altmann, M. and
                       Andrae, R. and Audard, M. and Bellas-Velidis, I. and
                       Benson, K. and Berthier, J. and Blomme, R. and Burgess, P.
                       and Busso, G. and Carry, B. and Cellino, A. and Clementini,
                       G. and Clotet, M. and Creevey, O. and Davidson, M. and De
                       Ridder, J. and Delchambre, L. and Dell'Oro, A. and
                       Ducourant, C. and Fouesneau, M. and Frémat, Y. and
                       Galluccio, L. and García-Torres, M. and González-Núñez,
                       J. and González-Vidal, J. J. and Gosset, E. and Guy, L. P.
                       and Halbwachs, J.-L. and Hambly, N. C. and Harrison, D. L.
                       and Hestroffer, D. and Hodgkin, S. T. and Hutton, A. and
                       Jasniewicz, G. and Jean-Antoine-Piccolo, A. and Jordan, S.
                       and Korn, A. J. and Krone-Martins, A. and Lanzafame, A. C.
                       and Lebzelter, T. and Löffler, W. and Manteiga, M. and
                       Marrese, P. M. and Martín-Fleitas, J. M. and Moitinho, A.
                       and Mora, A. and Muinonen, K. and Osinde, J. and Pancino,
                       E. and Pauwels, T. and Petit, J.-M. and Recio-Blanco, A.
                       and Richards, P. J. and Rimoldini, L. and Robin, A. C. and
                       Sarro, L. M. and Siopis, C. and Smith, M. and Sozzetti, A.
                       and Süveges, M. and Torra, J. and van Reeven, W. and
                       Abbas, U. and Abreu Aramburu, A. and Accart, S. and Aerts,
                       C. and Altavilla, G. and Álvarez, M. A. and Alvarez, R.
                       and Alves, J. and Anderson, R. I. and Anglada Varela, E.
                       and Antiche, E. and Antoja, T. and Arcay, B. and
                       Astraatmadja, T. L. and Bach, N. and Baker, S. G. and
                       Balaguer-Núñez, L. and Balm, P. and Barata, C. and
                       Barbato, D. and Barblan, F. and Barklem, P. S. and Barrado,
                       D. and Barros, M. and Barstow, M. A. and Bartholomé
                       Muñoz, L. and Bassilana, J.-L. and Becciani, U. and
                       Bellazzini, M. and Berihuete, A. and Bertone, S. and
                       Bianchi, L. and Bienaymé, O. and Blanco-Cuaresma, S. and
                       Boch, T. and Boeche, C. and Borrachero, R. and Bossini, D.
                       and Bouquillon, S. and Bragaglia, A. and Bramante, L. and
                       Breddels, M. A. and Bressan, A. and Brouillet, N. and
                       Brüsemeister, T. and Brugaletta, E. and Bucciarelli, B.
                       and Burlacu, A. and Busonero, D. and Butkevich, A. G. and
                       Buzzi, R. and Caffau, E. and Cancelliere, R. and
                       Cannizzaro, G. and Cantat-Gaudin, T. and Carballo, R. and
                       Carlucci, T. and Carrasco, J. M. and Casamiquela, L. and
                       Castellani, M. and Castro-Ginard, A. and Chemin, L. and
                       Chiavassa, A. and Cocozza, G. and Costigan, G. and Cowell,
                       S. and Crifo, F. and Crosta, M. and Crowley, C. and
                       Cuypers, J. and Dafonte, C. and Damerdji, Y. and
                       Dapergolas, A. and David, P. and David, M. and de Laverny,
                       P. and De Luise, F. and De March, R. and de Souza, R. and
                       de Torres, A. and Debosscher, J. and del Pozo, E. and
                       Delbo, M. and Delgado, A. and Delgado, H. E. and Diakite,
                       S. and Diener, C. and Distefano, E. and Dolding, C. and
                       Drazinos, P. and Durán, J. and Edvardsson, B. and Enke, H.
                       and Eriksson, K. and Esquej, P. and Eynard Bontemps, G. and
                       Fabre, C. and Fabrizio, M. and Faigler, S. and Falcão, A.
                       J. and Farràs Casas, M. and Federici, L. and Fedorets, G.
                       and Fernique, P. and Figueras, F. and Filippi, F. and
                       Findeisen, K. and Fonti, A. and Fraile, E. and Fraser, M.
                       and Frézouls, B. and Gai, M. and Galleti, S. and Garabato,
                       D. and García-Sedano, F. and Garofalo, A. and Garralda, N.
                       and Gavel, A. and Gavras, P. and Gerssen, J. and Giacobbe,
                       P. and Gilmore, G. and Girona, S. and Giuffrida, G. and
                       Glass, F. and Gomes, M. and Granvik, M. and Gueguen, A. and
                       Guerrier, A. and Guiraud, J. and Gutié, R. and Haigron, R.
                       and Hatzidimitriou, D. and Hauser, M. and Haywood, M. and
                       Heiter, U. and Helmi, A. and Heu, J. and Hofmann, W. and
                       Holland, G. and Huckle, H. E. and Hypki, A. and Icardi, V.
                       and Janßen, K. and Jevardat de Fombelle, G. and Jonker, P.
                       G. and Juhász, A. L. and Julbe, F. and Karampelas, A. and
                       Kewley, A. and Klar, J. and Kochoska, A. and Kohley, R. and
                       Kolenberg, K. and Kontizas, M. and Kontizas, E. and
                       Koposov, S. E. and Kordopatis, G. and Kostrzewa-Rutkowska,
                       Z. and Koubsky, P. and Lanza, A. F. and Lasne, Y. and
                       Lavigne, J.-B. and Le Fustec, Y. and Le Poncin-Lafitte, C.
                       and Lebreton, Y. and Leccia, S. and Leclerc, N. and
                       Lecoeur-Taibi, I. and Lenhardt, H. and Leroux, F. and Liao,
                       S. and Licata, E. and Lindstrøm, H. E. P. and Lister, T.
                       A. and Livanou, E. and Lobel, A. and López, M. and
                       Managau, S. and Mann, R. G. and Mantelet, G. and Marchal,
                       O. and Marchant, J. M. and Marconi, M. and Marinoni, S. and
                       Marschalkó, G. and Marshall, D. J. and Martino, M. and
                       Marton, G. and Mary, N. and Massari, D. and Matijevič, G.
                       and Mazeh, T. and McMillan, P. J. and Messina, S. and
                       Millar, N. R. and Molina, D. and Molinaro, R. and Molnár,
                       L. and Montegriffo, P. and Mor, R. and Morbidelli, R. and
                       Morel, T. and Morris, D. and Mulone, A. F. and Muraveva, T.
                       and Musella, I. and Nelemans, G. and Nicastro, L. and
                       Noval, L. and O'Mullane, W. and Ordénovic, C. and
                       Ordóñez-Blanco, D. and Osborne, P. and Pagani, C. and
                       Pagano, I. and Pailler, F. and Palacin, H. and Palaversa,
                       L. and Panahi, A. and Pawlak, M. and Piersimoni, A. M. and
                       Pineau, F.-X. and Plachy, E. and Plum, G. and Poggio, E.
                       and Poujoulet, E. and Prša, A. and Pulone, L. and Racero,
                       E. and Ragaini, S. and Rambaux, N. and Regibo, S. and
                       Reylé, C. and Riclet, F. and Ripepi, V. and Riva, A. and
                       Rivard, A. and Rixon, G. and Roegiers, T. and Roelens, M.
                       and Romero-Gómez, M. and Rowell, N. and Royer, F. and
                       Ruiz-Dern, L. and Sadowski, G. and Sagristà Sellés, T.
                       and Sahlmann, J. and Salgado, J. and Salguero, E. and
                       Sanna, N. and Santana-Ros, T. and Sarasso, M. and Savietto,
                       H. and Schultheis, M. and Sciacca, E. and Segol, M. and
                       Segovia, J. C. and Ségransan, D. and Shih, I.-C. and
                       Siltala, L. and Silva, A. F. and Smart, R. L. and Smith, K.
                       W. and Solano, E. and Solitro, F. and Sordo, R. and Soria
                       Nieto, S. and Souchay, J. and Spagna, A. and Spoto, F. and
                       Stampa, U. and Steele, I. A. and Stephenson, C. A. and
                       Stoev, H. and Suess, F. F. and Surdej, J. and Szabados, L.
                       and Szegedi-Elek, E. and Tapiador, D. and Taris, F. and
                       Tauran, G. and Taylor, M. B. and Teixeira, R. and Terrett,
                       D. and Teyssandier, P. and Thuillot, W. and Titarenko, A.
                       and Torra Clotet, F. and Turon, C. and Ulla, A. and
                       Utrilla, E. and Uzzi, S. and Vaillant, M. and Valentini, G.
                       and Valette, V. and van Elteren, A. and Van Hemelryck, E.
                       and van Leeuwen, M. and Vaschetto, M. and Vecchiato, A. and
                       Veljanoski, J. and Viala, Y. and Vicente, D. and Vogt, S.
                       and von Essen, C. and Voss, H. and Votruba, V. and
                       Voutsinas, S. and Walmsley, G. and Weiler, M. and Wertz, O.
                       and Wevers, T. and Wyrzykowski, Ł. and Yoldas, A. and
                       Žerjal, M. and Ziaeepour, H. and Zorec, J. and Zschocke,
                       S. and Zucker, S. and Zurbach, C. and Zwitter, T.",
      title         = "{Gaia Data Release 2. The celestial reference frame
      year          = "2018",