9 August 2016 Design of a derotator for the 4 m DAG telescope
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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.
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Jérémie Baudet, Jérémie Baudet, Laurent Jolissaint, Laurent Jolissaint, Onur Keskin, Onur Keskin, Cahit Yesilyaprak, Cahit Yesilyaprak, Sinan K. Yerli, Sinan K. Yerli, } "Design of a derotator for the 4 m DAG telescope", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99085L (9 August 2016); doi: 10.1117/12.2234392; https://doi.org/10.1117/12.2234392
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