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Photometric and Imaging Performance

Published online by Cambridge University Press:  25 September 2002

O. Bienaymé ,
C. Turon  and
E. Høg
E. Høg*
Affiliation:
Copenhagen University Observatory, Juliane Maries Vej 30, DK 2100 Copenhagen Ø, Denmark
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Abstract

Three topics within GAIA photometry have been selected for discussionhere. (1) The sampling scheme of the CCDs has been tuned to serve thevarious purposes: detection of stars, astrometry, broad- andmedium-band photometry, and imaging of a small area around eachdetected star, but the tuning may not yet be optimal. (2) Thecalibration of CCD sensitivity is critical since we aim formillimagnitude accuracy, the spikes of the diffraction image aresuited for an accurate calibration of the magnitude scale, and forextending the range of astrometry and photometry to very bright stars.(3) Finally the various photometric filter systems are illustrated.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 2: GAIA: A European Space Project , 2002 , pp. 27 - 37
Copyright
© EAS, EDP Sciences, 2002

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