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Proceedings Paper

Design of a derotator for the 4 m DAG telescope
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Paper Abstract

This paper summarize our work on the design of a field derotator for the adaptive optics instruments Nasmyth platform of DAG (Dogu Anadolu Gozlemevi), a new 4 m telescope for astronomical observations near the city of Erzurum, Turkey. While the telescope follows an astronomical object, its pupil sees a rotation of the object around the optical axis which depends on the telescope geographic coordinate and the object sky coordinate. This effect is called the field rotation. This rotation needs to be compensated during the astronomical object data acquisition. In this report we demonstrate the feasibility of placing the derotator (a K-mirror design) in the telescope fork central hole and propose a preliminary design, considering flexures.

Paper Details

Date Published: 9 August 2016
PDF: 6 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99085L (9 August 2016);
Show Author Affiliations
Jérémie Baudet, Univ. of Applied Sciences Western Switzerland (Switzerland)
Laurent Jolissaint, Univ. of Applied Sciences Western Switzerland (Switzerland)
Onur Keskin, Isik Univ. (Turkey)
Cahit Yesilyaprak, Atatürk Univ. (Turkey)
Sinan K. Yerli, Middle East Technical Univ. (Turkey)

Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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