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Verfasst von:Lindegren, Lennart [VerfasserIn]   i
 Bastian, Ulrich [VerfasserIn]   i
 Biermann, Michael [VerfasserIn]   i
 Stampa, Ulrike [VerfasserIn]   i
 Altmann, Martin [VerfasserIn]   i
 Brüsemeister, Thomas [VerfasserIn]   i
 Hauser, Marcus [VerfasserIn]   i
 Hofmann, Wilfried [VerfasserIn]   i
 Jordan, Stefan [VerfasserIn]   i
 Lenhardt, Helmut [VerfasserIn]   i
 Löffler, Wolfgang [VerfasserIn]   i
Titel:Gaia data release 2
Titelzusatz:The astrometric solution
Verf.angabe:L. Lindegren, J. Hernández, A. Bombrun, S. Klioner, U. Bastian, M. Ramos-Lerate, A. de Torres, H. Steidelmüller, C. Stephenson, D. Hobbs, U. Lammers, M. Biermann, R. Geyer, T. Hilger, D. Michalik, U. Stampa, P.J. McMillan, J. Castañeda, M. Clotet, G. Comoretto, M. Davidson, C. Fabricius, G. Gracia, N.C. Hambly, A. Hutton, A. Mora, J. Portell, F. van Leeuwen, U. Abbas, A. Abreu, M. Altmann, A. Andrei, E. Anglada, L. Balaguer-Núñez, C. Barache, U. Becciani, S. Bertone, L. Bianchi, S. Bouquillon, G. Bourda, T. Brüsemeister, B. Bucciarelli, D. Busonero, R. Buzzi, R. Cancelliere, T. Carlucci, P. Charlot, N. Cheek, M. Crosta, C. Crowley, J. de Bruijne, F. de Felice, R. Drimmel, P. Esquej, A. Fienga, E. Fraile, M. Gai, N. Garralda, J.J. González-Vidal, R. Guerra, M. Hauser, W. Hofmann, B. Holl, S. Jordan, M.G. Lattanzi, H. Lenhardt, S. Liao, E. Licata, T. Lister, W. Löffler, J. Marchant, J.-M. Martin-Fleitas, R. Messineo, F. Mignard, R. Morbidelli, E. Poggio, A. Riva, N. Rowell, E. Salguero, M. Sarasso, E. Sciacca, H. Siddiqui, R.L. Smart, A. Spagna, I. Steele, F. Taris, J. Torra, A. van Elteren, W. van Reeven, and A. Vecchiato
E-Jahr:2018
Jahr:10 August 2018
Umfang:25 S.
Fussnoten:Gesehen am 28.02.2019
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2018
Band/Heft Quelle:616(2018) Artikel-Nummer A2, 25 Seiten
ISSN Quelle:1432-0746
Abstract:<i>Context. Gaia<i/> Data Release 2 (<i>Gaia<i/> DR2) contains results for 1693 million sources in the magnitude range 3 to 21 based on observations collected by the European Space Agency <i>Gaia<i/> satellite during the first 22 months of its operational phase.<i>Aims.<i/> We describe the input data, models, and processing used for the astrometric content of <i>Gaia<i/> DR2, and the validation of these resultsperformed within the astrometry task.<i>Methods.<i/> 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. These data were calculated in two steps. First, the satellite attitude and the astrometric calibration parameters of the CCDs were obtained in an astrometric global iterative solution for 16 million selected sources, using about 1% of the input data. This primary solution was tied to the extragalactic International Celestial Reference System (ICRS) by means of quasars. The resulting attitude and calibration were then used to calculate the astrometric parameters of all the sources. Special validation solutions were used to characterise the random and systematic errors in parallax and proper motion.<i>Results.<i/> 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 (<i>G<i/> < 14 mag) sources, 0.1 mas at <i>G<i/> = 17 mag, and 0.7 masat <i>G<i/> = 20 mag. In the proper motion components the corresponding uncertainties are 0.05, 0.2, and 1.2 mas yr<sup>−1<sup/>, respectively.The optical reference frame defined by <i>Gaia<i/> DR2 is aligned with ICRS and is non-rotating with respect to the quasars to within 0.15 mas yr<sup>−1<sup/>. 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<sup>−1<sup/> in proper motion are seen on small (< 1 deg) and intermediate (20 deg) angular scales. Important statistics and information for the users of the <i>Gaia<i/> DR2 astrometry are given in the appendices.
DOI:doi:10.1051/0004-6361/201832727
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext: http://dx.doi.org/10.1051/0004-6361/201832727
 DOI: https://doi.org/10.1051/0004-6361/201832727
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1588206211
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