10 July 2018 4MOST metrology system error analysis
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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.
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Roland Winkler, Roland Winkler, Samuel C. Barden, Samuel C. Barden, Allar Saviauk, Allar Saviauk, Steffen Frey, Steffen Frey, Nicolas Azais, Nicolas Azais, Peter Gillingham, Peter Gillingham, Scott Smedley, Scott Smedley, } "4MOST metrology system error analysis", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070286 (10 July 2018); doi: 10.1117/12.2313522; https://doi.org/10.1117/12.2313522
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