Title: Census of the Galaxy: Challenges for Photometry and Spectrometry with GAIA: Proceedings of the Workshop held in Vilnius, Lithuania 2?6 July 2001 . First Gaia Photometry Working Group, Viln)
Publisher: Springer
Publication Date: 2002
Language: English
ISBN 10: 1402005962
ISBN 13: 9781402005961
Binding: Hardcover
Condition: New

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Synopsis

Astrometry from space was performed for the first time and with great success by the ESA Hipparcos satellite (1989-93). This mission was designed as an as� trometry mission, but the use of a photon counting detector made it possible to produce very important photometric results: the most accurate astronomical pho� tometry ever by the main Hipparcos mission in a very broad band of 120000 stars, and the two-colour Tycho-2 photometry of 2.5 million stars. The cornerstone ESA mission GAIA was approved in October 2000 for launch not later than 2012. This mission will use CCDs in time-delayed integration mode instead of the photo-cathode detectors used in Hipparcos. Due to the higher quantum efficiency of the CCDs, simultaneous integration of many stars, and larger tele� scope apertures GAIA will utilize the star light a million times more efficiently than Hipparcos, resulting in astrometry and multi-colour photometry for one billion stars. GAIA photometry is crucial for the scientific utilization of the astrometric results, and the photometric data have a high scientific content in themselves.

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