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16 November 1982 Coude Auxiliary Telescope (CAT): A Low Cost Telescope At The European Southern Observatory
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The 1.4 m Coude Auxiliary Telescope (CAT) is designed for spectroscopy and will be used whenever the ESO 3.6 m telescope is not used in coude focus. The telescope is designed as an Alt-Alt mounting, which gives mechanically an attractive and inexpensive structure without any need for big counterweight systems. The optical configuration is of the Nasmyth type with a flat moveable third mirror mounted in the center of the telescope. The main mirror has a f-ratio of f/3. The exit f-ratio is f/120. The telescope is completely remote controlled, as it is placed in a tower separated from the operating center. Guiding is performed via a low light level TV-camera on the slit of the Coude Echelle Spectrograph (CES). The drive systems for the two axes in the Alt-Alt mounting are identical. They are of the direct drive type, with a torque motor, tacho generator and encoder connected directly to the shaft without any reduction gear. The positioning system is based to a great extent on microprocessors.
© (1982) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
K. Klim and M. Ziebell "Coude Auxiliary Telescope (CAT): A Low Cost Telescope At The European Southern Observatory", Proc. SPIE 0331, Instrumentation in Astronomy IV, (16 November 1982);


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