Journal Article

Astrometric effects of non-uniform telescope throughput

M. Gai and R. Cancelliere

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 391, issue 3, pages 1451-1456
Published in print December 2008 | ISSN: 0035-8711
Published online November 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13996.x
Astrometric effects of non-uniform telescope throughput

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In real telescopes, the optical parameters evolve with time, and the degradation is often not uniform. This introduces variations in the image profile and therefore photocentre displacements which, unless corrected, may result in astrometric errors. The effects induced on individual telescopes and interferometric arrays are derived by numerical implementation of a range of cases. The results are evaluated with respect to the potential impact on the most relevant experiments for high-precision astrometry in the near future, i.e. Gaia, PRIMA and SIM, and to mitigation techniques applicable from design stage to calibrations.

Keywords: techniques: image processing; telescopes; astrometry

Journal Article.  4473 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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