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Proceedings Paper

4MOST metrology system error analysis
Author(s): Roland Winkler; Samuel C. Barden; Allar Saviauk; Steffen Frey; Nicolas Azais; Peter Gillingham; Scott Smedley
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Paper Abstract

The 4-metre Multi-Object Spectroscopic Telescope (4MOST) instrument uses 2436 individually positioned optical fibres to couple the light of targets into its spectrographs. The metrology system determines the position of the back-illuminated fibres on the focal surface of the telescope. It consists of 4 identical cameras that are mounted on the spider vanes of the secondary mirror of the VISTA telescope and look through the entire optical train, including M1, M2 and the WFC/ADC unit. Here, we present an exhaustive study on the expected centroiding errors, including but not limited to lens fabrication errors, seeing, mirror distortions and parallax effects.

Paper Details

Date Published: 10 July 2018
PDF: 17 pages
Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070286 (10 July 2018); doi: 10.1117/12.2313522
Show Author Affiliations
Roland Winkler, Leibniz-Institut für Astrophysik Potsdam (Germany)
Samuel C. Barden, Leibniz-Institut für Astrophysik Potsdam (Germany)
Allar Saviauk, Leibniz-Institut für Astrophysik Potsdam (Germany)
Steffen Frey, Leibniz-Institut für Astrophysik Potsdam (Germany)
Nicolas Azais, Iridescence (France)
Peter Gillingham, Australian Astronomical Observatory (Australia)
Scott Smedley, Australian Astronomical Observatory (Australia)

Published in SPIE Proceedings Vol. 10702:
Ground-based and Airborne Instrumentation for Astronomy VII
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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