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Proceedings Paper

Coude Auxiliary Telescope (CAT): A Low Cost Telescope At The European Southern Observatory
Author(s): K. Klim; M. Ziebell
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Paper Abstract

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.

Paper Details

Date Published: 16 November 1982
PDF: 6 pages
Proc. SPIE 0331, Instrumentation in Astronomy IV, (16 November 1982); doi: 10.1117/12.933461
Show Author Affiliations
K. Klim, European Southern Observatory (Germany)
M. Ziebell, European Southern Observatory (Germany)


Published in SPIE Proceedings Vol. 0331:
Instrumentation in Astronomy IV
David L. Crawford, Editor(s)

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