Investigation of the seeing and the optics of the two-meter telescope of the Terskol Peak Observatory

Physics – Optics

Scientific paper

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Scientific paper

The investigation of the Cassegrain focus optics of the two-meter telescope of the Terscol Peak was completed after additional observations were made on washing the mirrors and blowing through the telescope tube. The image size d_{0.8} = 0.60'' (80 % energy concentration) can be reached after the elimination of aberration. An analysis of Shack-Gartmann images showed that the coma should be eliminating to refine the image quality and to increase the telescope resolution. At the system without correction of astigmatism, the coma parameters are F_x = 7.34±0.83 mm and F_y = 3.94± 0.37 mm, that correspond to the shift Delta X = 1.32± 0.29 mm and Delta Y = -0.68± 0.40 mm. Insignificant aberrations caused by the flexure of the telescope tube still remain in this case. With a system of astigmatism correction, the coma parameters are F_x = 8.13± 2.50 mm and F_y =-4.25± 1.50 mm, that correspond to the shift Delta X = 1.38± 0.42 mm and Delta Y = -0.73± 0.56 mm.

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