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Gaia Data Release 2: The astrometric solution

dc.contributor.authorLINDEGREN, L.
hal.structure.identifierMaison des Agriculteurs
dc.contributor.authorHERNANDEZ, J.
hal.structure.identifierUniversité Grenoble Alpes - UFR Langage, lettres et arts du spectacle, information et communication - Dpt Lettres et arts du spectacle [UGA UFR LLASIC LAS]
dc.contributor.authorBOMBRUN, A.
dc.contributor.authorKLIONER, S.
hal.structure.identifierZentrum für astronomie
dc.contributor.authorBASTIAN, U.
dc.contributor.authorRAMOS-LERATE, M.
dc.contributor.authorDE TORRES, A.
dc.contributor.authorSTEIDELMULLER, H.
dc.contributor.authorSTEPHENSON, C.
dc.contributor.authorHOBBS, D.
hal.structure.identifierAgence Spatiale Européenne = European Space Agency [ESA]
dc.contributor.authorLAMMERS, U.
hal.structure.identifierDepartment of nuclear medicine
dc.contributor.authorBIERMANN, M.
hal.structure.identifierDepartment of Plant Ecology
dc.contributor.authorGEYER, R.
dc.contributor.authorHILGER, T.
dc.contributor.authorMICHALIK, D.
dc.contributor.authorSTAMPA, U.
dc.contributor.authorMCMILLAN, P. J.
dc.contributor.authorCASTANEDA, J.
dc.contributor.authorCLOTET, M.
hal.structure.identifierINAF - Osservatorio Astrofisico di Arcetri [OAA]
dc.contributor.authorCOMORETTO, G.
dc.contributor.authorDAVIDSON, M.
hal.structure.identifierNelson Mandela University [Port Elizabeth]
dc.contributor.authorFABRICIUS, C.
dc.contributor.authorGRACIA, G.
dc.contributor.authorHAMBLY, N. C.
dc.contributor.authorHUTTON, A.
hal.structure.identifierDepartamento de Microbiología y Parasitología [Lugo, Spain]
dc.contributor.authorMORA, A.
dc.contributor.authorPORTELL, J.
dc.contributor.authorVAN LEEUWEN, F.
hal.structure.identifierAUTRES
dc.contributor.authorABBAS, U.
dc.contributor.authorABREU, A.
hal.structure.identifierZentrum für astronomie
hal.structure.identifierSystèmes de Référence Temps Espace [SYRTE]
dc.contributor.authorALTMANN, M.
hal.structure.identifierFranche-Comté Électronique Mécanique, Thermique et Optique - Sciences et Technologies (UMR 6174) [FEMTO-ST]
dc.contributor.authorANDREI, A.
hal.structure.identifierDepartamento de Fisica de la Materia Condensada [Madrid] [FMC]
dc.contributor.authorANGLADA, E.
hal.structure.identifierUniversitat de Barcelona [UB]
dc.contributor.authorBALAGUER-NÚÑEZ, L.
hal.structure.identifierSystèmes de Référence Temps Espace [SYRTE]
dc.contributor.authorBARACHE, C.
dc.contributor.authorBECCIANI, U.
hal.structure.identifierSystèmes de Référence Temps Espace [SYRTE]
dc.contributor.authorBERTONE, Stefano
hal.structure.identifierCEA Le Ripault [CEA Le Ripault]
dc.contributor.authorBIANCHI, L.
hal.structure.identifierSystèmes de Référence Temps Espace [SYRTE]
dc.contributor.authorBOUQUILLON, S.
hal.structure.identifierM2A 2018
dc.contributor.authorBOURDA, G.
dc.contributor.authorBRUSEMEISTER, T.
dc.contributor.authorBUCCIARELLI, B.
dc.contributor.authorBUSONERO, D.
dc.contributor.authorBUZZI, R.
dc.contributor.authorCANCELLIERE, R.
hal.structure.identifierSystèmes de Référence Temps Espace [SYRTE]
dc.contributor.authorCARLUCCI, T.
hal.structure.identifierM2A 2018
dc.contributor.authorCHARLOT, P.
dc.contributor.authorCHEEK, N.
dc.contributor.authorCROSTA, M.
dc.contributor.authorCROWLEY, C.
dc.contributor.authorDE BRUIJNE, J.
dc.contributor.authorDE FELICE, F.
dc.contributor.authorDRIMMEL, R.
dc.contributor.authorESQUEJ, P.
hal.structure.identifierGéoazur [GEOAZUR 7329]
dc.contributor.authorFIENGA, A.
dc.contributor.authorFRAILE, E.
hal.structure.identifierINAF - Osservatorio Astrofisico di Torino [OATo]
dc.contributor.authorGAI, M.
dc.contributor.authorGARRALDA, N.
dc.contributor.authorGONZALEZ-VIDAL, J. J.
hal.structure.identifierLaboratorio de Inmunologıa y Virologıa
dc.contributor.authorGUERRA, R.
dc.contributor.authorHAUSER, M.
dc.contributor.authorHOFMANN, W.
hal.structure.identifierHeckscher-Klinikum
dc.contributor.authorHOLL, B.
hal.structure.identifierLaboratoire d'Ecologie Alpine [LECA ]
dc.contributor.authorJORDAN, S.
dc.contributor.authorLATTANZI, M. G.
dc.contributor.authorLENHARDT, H.
dc.contributor.authorLIAO, S.
dc.contributor.authorLICATA, E.
dc.contributor.authorLISTER, T.
dc.contributor.authorLOFFLER, W.
hal.structure.identifierDépartement immunologie-oncologie
dc.contributor.authorMARCHANT, J.
dc.contributor.authorMARTIN-FLEITAS, J.-M.
dc.contributor.authorMESSINEO, R.
hal.structure.identifierJoseph Louis LAGRANGE [LAGRANGE]
dc.contributor.authorMIGNARD, F.
dc.contributor.authorMORBIDELLI, R.
dc.contributor.authorPOGGIO, E.
hal.structure.identifierInstitute of Hepatology
dc.contributor.authorRIVA, A.
dc.contributor.authorROWELL, N.
dc.contributor.authorSALGUERO, E.
dc.contributor.authorSARASSO, M.
dc.contributor.authorSCIACCA, E.
hal.structure.identifierHuman Cancer Genetics Program
dc.contributor.authorSIDDIQUI, H.
hal.structure.identifierINAF - Osservatorio Astrofisico di Torino [OATo]
dc.contributor.authorSMART, R. L.
dc.contributor.authorSPAGNA, A.
hal.structure.identifierAstrophysics Research Institute [Liverpool] [ARI]
dc.contributor.authorSTEELE, I.
hal.structure.identifierSystèmes de Référence Temps Espace [SYRTE]
dc.contributor.authorTARIS, F.
dc.contributor.authorTORRA, J.
dc.contributor.authorVAN ELTEREN, A.
dc.contributor.authorVAN REEVEN, W.
hal.structure.identifierAstrometry
dc.contributor.authorVECCHIATO, A.
dc.date.issued2018-08
dc.identifier.issn0004-6361
dc.description.abstractEnGaia Data Release 2 (Gaia DR2) contains results for 1693 million sources in the magnitude range 3 to 21 based on observations collected by the European Space Agency Gaia satellite during the first 22 months of its operational phase. We describe the input data, models, and processing used for the astrometric content of Gaia DR2, and the validation of these results performed within the astrometry task. Some 320 billion centroid positions from the pre-processed astrometric CCD observations were used to estimate the five astrometric parameters (positions, parallaxes, and proper motions) for 1332 million sources, and approximate positions at the reference epoch J2015.5 for an additional 361 million mostly faint sources. Special validation solutions were used to characterise the random and systematic errors in parallax and proper motion. For the sources with five-parameter astrometric solutions, the median uncertainty in parallax and position at the reference epoch J2015.5 is about 0.04 mas for bright (G<14 mag) sources, 0.1 mas at G=17 mag, and 0.7 mas at G=20 mag. In the proper motion components the corresponding uncertainties are 0.05, 0.2, and 1.2 mas/yr, respectively. The optical reference frame defined by Gaia DR2 is aligned with ICRS and is non-rotating with respect to the quasars to within 0.15 mas/yr. From the quasars and validation solutions we estimate that systematics in the parallaxes depending on position, magnitude, and colour are generally below 0.1 mas, but the parallaxes are on the whole too small by about 0.03 mas. Significant spatial correlations of up to 0.04 mas in parallax and 0.07 mas/yr in proper motion are seen on small (<1 deg) and intermediate (20 deg) angular scales. Important statistics and information for the users of the Gaia DR2 astrometry are given in the appendices.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enAstrophysics - Instrumentation and Methods for Astrophysics
dc.title.enGaia Data Release 2: The astrometric solution
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201832727
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]
dc.subject.halPhysique [physics]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]
dc.identifier.arxiv1804.09366
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A2
bordeaux.volume616
bordeaux.peerReviewedoui
hal.identifierhal-01797082
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01797082v1
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