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Proceedings Paper

GAIA: global astrometric interferometer for astrophysics
Author(s): Lennart Lindegren; Michael A.C. Perryman; Ulrich Bastian; Christopher Dainty; E. Hog; F. van Leeuwen; J. Kovalevsky; Antoine Labeyrie; Sacha Loiseau; F. Mignard; Jacco C. Noordam; Rudolf S. le Poole; P. Thejll; Farrokh Vakili
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Paper Abstract

We describe a concept for an interferometric space mission dedicated to global (wide-angle) astrometry. The GAIA satellite contains two small (baseline APEQ 3 m) optical interferometers of the Fizeau type, mechanically set at a large and fixed angle to each other. Each interferometer has a field of view of about one degree. Continuous rotation of the whole satellite provides angular connections between the stars passing through the two fields of view. Positions, absolute parallaxes and annual proper motions can be determined with accuracies on the 20 micro-arcsec level. The observing programme may consist of all objects to a limiting magnitude around V = 15-16, including 50 million stars. The GAIA concept, which has been proposed for a Cornerstone Mission within the European Space Agency's long-term science programme, is based on the same general principles as the very successful ESA Hipparcos mission, but takes advantage of the much higher resolution and efficiency permitted by interferometry and modern detector techniques.

Paper Details

Date Published: 9 June 1994
PDF: 10 pages
Proc. SPIE 2200, Amplitude and Intensity Spatial Interferometry II, (9 June 1994); doi: 10.1117/12.177278
Show Author Affiliations
Lennart Lindegren, Lund Observatory (Sweden)
Michael A.C. Perryman, ESTEC (Netherlands)
Ulrich Bastian, Astronomisches Rechen-Institut (Germany)
Christopher Dainty, Blackett Lab. (United Kingdom)
E. Hog, Copenhagen Univ. Observatory (Sweden)
F. van Leeuwen, Royal Greenwich Observatory (Sweden)
J. Kovalevsky, Observatoire de la Cote d'Azur (Sweden)
Antoine Labeyrie, Observatoire de Calern (France)
Sacha Loiseau, CNES (France)
F. Mignard, Observatoire de la Cote d'Azur (Sweden)
Jacco C. Noordam, Netherlands Foundation for Research in Astronomy (Netherlands)
Rudolf S. le Poole, Sterrewacht Leiden (Netherlands)
P. Thejll, Niels Bohr Institute (Sweden)
Farrokh Vakili, Observatoire de Calern (France)

Published in SPIE Proceedings Vol. 2200:
Amplitude and Intensity Spatial Interferometry II
James B. Breckinridge, Editor(s)

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