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The Tycho-Gaia Astrometric Solution

Lindegren, Lennart LU orcid (2017) In Proceedings of the International Astronomical Union 12(S330). p.41-48
Abstract

Gaia DR1 is based on the first 14 months of Gaia's observations. This is not long enough to reliably disentangle the parallax effect from proper motion. For most sources, therefore, only positions and magnitudes are given. Parallaxes and proper motions were nevertheless obtained for about two million of the brighter stars through the Tycho-Gaia astrometric solution (TGAS), combining the Gaia observations with the much earlier Hipparcos and Tycho-2 positions. In this review I focus on some important characteristics and limitations of TGAS, in particular the reference frame, astrometric uncertainties, correlations, and systematic errors.

Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
astrometry, Catalogs, reference systems, stars: distances, stars: general
in
Proceedings of the International Astronomical Union
volume
12
issue
S330
pages
8 pages
publisher
Cambridge University Press
external identifiers
  • scopus:85054250524
ISSN
1743-9213
DOI
10.1017/S1743921317005919
language
English
LU publication?
yes
id
9ad19f70-a9fb-48c1-bf8a-025b29b5ce15
date added to LUP
2018-10-31 12:48:00
date last changed
2024-03-18 18:01:26
@article{9ad19f70-a9fb-48c1-bf8a-025b29b5ce15,
  abstract     = {{<p>Gaia DR1 is based on the first 14 months of Gaia's observations. This is not long enough to reliably disentangle the parallax effect from proper motion. For most sources, therefore, only positions and magnitudes are given. Parallaxes and proper motions were nevertheless obtained for about two million of the brighter stars through the Tycho-Gaia astrometric solution (TGAS), combining the Gaia observations with the much earlier Hipparcos and Tycho-2 positions. In this review I focus on some important characteristics and limitations of TGAS, in particular the reference frame, astrometric uncertainties, correlations, and systematic errors.</p>}},
  author       = {{Lindegren, Lennart}},
  issn         = {{1743-9213}},
  keywords     = {{astrometry; Catalogs; reference systems; stars: distances; stars: general}},
  language     = {{eng}},
  month        = {{04}},
  number       = {{S330}},
  pages        = {{41--48}},
  publisher    = {{Cambridge University Press}},
  series       = {{Proceedings of the International Astronomical Union}},
  title        = {{The Tycho-Gaia Astrometric Solution}},
  url          = {{http://dx.doi.org/10.1017/S1743921317005919}},
  doi          = {{10.1017/S1743921317005919}},
  volume       = {{12}},
  year         = {{2017}},
}