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Proceedings Paper

Increasing observing efficiency by modeling telescope focus positions
Author(s): Sarah Gajadhar; Derrick Salmon; Gregory Barrick
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Paper Abstract

With the advent of Queue observing at the Canada-France-Hawaii Telescope (CFHT), much emphasis has been placed on minimizing the overheads in the observing process. Ensuring telescope focus is a necessary overhead, but taking the focus sequences required to keep focus during the night adds significant time. In order to nearly eliminate this overhead without sacrificing good telescope focus, the necessary focus position for each instrument has been modeled as a function of telescope temperature and position on the sky. The correct focus position is calculated instead of measured, so focus updates are practically instantaneous. The model coefficients are updated with new data regularly. Automatic focus using calculated focus positions has been implemented for MegaCam, WIRCam and ESPaDOnS.

Paper Details

Date Published: 23 July 2008
PDF: 8 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70183W (23 July 2008); doi: 10.1117/12.787667
Show Author Affiliations
Sarah Gajadhar, Canada-France-Hawaii Telescope (United States)
Derrick Salmon, Canada-France-Hawaii Telescope (United States)
Gregory Barrick, Canada-France-Hawaii Telescope (United States)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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