In Flange Derotator Design for the 4m DAG telescope

Unal A. C., Sarajlic M., Jolissaint De Sepibus L., KESKIN O., YEŞİLYAPRAK C., Baudet J.

Conference on Ground-based and Airborne Telescopes VII, Texas, United States Of America, 10 - 15 June 2018, vol.10700 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 10700
  • Doi Number: 10.1117/12.2313912
  • City: Texas
  • Country: United States Of America
  • Keywords: Field derotator, field rotation, alt-azimut, Ritchey-Chretien, Nasmyth, K-mirror, Dove prism
  • Ataturk University Affiliated: Yes


The field rotation effect can be described as observing the gyration of an object with the pupil of the Eastern Anatolian Observatory (DAG) telescope around the optical axis under the influence of the latitude of the observatory while the telescope is following that astronomical object. This is possible as a result of the alt-azimuthal mount of the telescope. (the orientation of the astronomical observed object, the parallactic angle, is defined as "q")