|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
27 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Gaia Early Data Release 3: The astrometric solution | | L. Lindegren
; S.A. Klioner
; J. Hernández
; A. Bombrun
; M. Ramos-Lerate
; H. Steidelmüller
; U. Bastian
; M. Biermann
; A. de Torres
; E. Gerlach
; R. Geyer
; T. Hilger
; D. Hobbs
; U. Lammers
; P.J. McMillan
; C.A. Stephenson
; J. Castañeda
; M. Davidson
; C. Fabricius
; G. Gracia-Abril
; J. Portell
; N. Rowell
; D. Teyssier
; F. Torra
; S. Bartolomé
; M. Clotet
; N. Garralda
; J.J. González-Vidal
; J. Torra
; U. Abbas
; M. Altmann
; E. Anglada Varela
; L. Balaguer-Núñez
; Z. Balog
; C. Barache
; U. Becciani
; M. Bernet
; S. Bertone
; L. Bianchi
; S. Bouquillon
; A.G.A. Brown
; B. Bucciarelli
; D. Busonero
; A.G. Butkevich
; R. Buzzi
; R. Cancelliere
; T. Carlucci
; P. Charlot
; M.-R. L. Cioni
; M. Crosta
; C. Crowley
; E.F. del Peloso
; E. del Pozo
; R. Drimmel
; P. Esquej
; A. Fienga
; E. Fraile
; M. Gai
; M. Garcia-Reinaldos
; R. Guerra
; N.C. Hambly
; M. Hauser
; K. Janßen
; S. Jordan
; Z. Kostrzewa-Rutkowska
; M.G. Lattanzi
; S. Liao
; E. Licata
; T.A. Lister
; W. Löffler
; J.M. Marchant
; A. Masip
; F. Mignard
; A. Mints
; D. Molina
; A. Mora
; R. Morbidelli
; C.P. Murphy
; C. Pagani
; P. Panuzzo
; X. Peñalosa Esteller
; E. Poggio
; P. Re Fiorentin
; A. Riva
; A. Sagristà Sellés
; V. Sanchez Gimenez
; M. Sarasso
; E. Sciacca
; H.I. Siddiqui
; R.L. Smart
; D. Souami
; A. Spagna
; I.A. Steele
; F. Taris
; E. Utrilla
; W. van Reeven
; A. Vecchiato
; | | Date: |
6 Dec 2020 | | Abstract: | Gaia Early Data Release 3 (Gaia EDR3) contains results for 1.812 billion
sources in the magnitude range G = 3 to 21 based on observations collected by
the European Space Agency Gaia satellite during the first 34 months of its
operational phase. We describe the input data, the models, and the processing
used for the astrometric content of Gaia EDR3, as well as the validation of
these results performed within the astrometry task. The processing broadly
followed the same procedures as for Gaia DR2, but with significant improvements
to the modelling of observations. For the first time in the Gaia data
processing, colour-dependent calibrations of the line- and point-spread
functions have been used for sources with well-determined colours from DR2. In
the astrometric processing these sources obtained five-parameter solutions,
whereas other sources were processed using a special calibration that allowed a
pseudocolour to be estimated as the sixth astrometric parameter. Compared with
DR2, the astrometric calibration models have been extended, and the
spin-related distortion model includes a self-consistent determination of
basic-angle variations, improving the global parallax zero point. Gaia EDR3
gives full astrometric data (positions at epoch J2016.0, parallaxes, and proper
motions) for 1.468 billion sources (585 million with five-parameter solutions,
882 million with six parameters), and mean positions at J2016.0 for an
additional 344 million. Solutions with five parameters are generally more
accurate than six-parameter solutions, and are available for 93% of the sources
brighter than G = 17 mag. The median uncertainty in parallax and annual proper
motion is 0.02-0.03 mas at magnitude G = 9 to 14, and around 0.5 mas at G = 20.
Extensive characterisation of the statistical properties of the solutions is
provided, including the estimated angular power spectrum of parallax bias from
the quasars. | | Source: | arXiv, 2012.03380 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER