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9 August 2016 Design of a derotator for the 4 m DAG telescope
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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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jérémie Baudet, Laurent Jolissaint, Onur Keskin, Cahit Yesilyaprak, and 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);

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