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Gaia reference frame amid quasar variability and proper motion patterns in the data
R. K. Bachchan, D. Hobbs, L. Lindegren
Gaia's very accurate astrometric measurements will allow the International Celestial Reference Frame (ICRF) to be improved by a few orders of magnitude in the optical. Several sets…
Quasars can be used to verify the parallax zero-point of the Tycho-Gaia Astrometric Solution
Daniel Michalik, Lennart Lindegren
Context. The Gaia project will determine positions, proper motions, and parallaxes for more than one billion stars in our Galaxy. It is known that Gaia's two telescopes are affecte…
Gaia astrometry for stars with too few observations - a Bayesian approach
Daniel Michalik, Lennart Lindegren, David Hobbs +1
Gaia's astrometric solution aims to determine at least five parameters for each star, together with appropriate estimates of their uncertainties and correlations. This requires at…
The Gaia Basic angle: measurement and variations
Alcione Mora, Ulrich Bastian, Michael Biermann +5
The ESA Gaia mission uses two telescopes to create the most ambitious survey of the Galaxy. The angle between them must be known with exquisite precision and accuracy. An interfero…