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Proceedings Paper

Acquisition and guider unit for the Cassegrain focus of the 4.2-m William Herschel Telescope
Author(s): Peter A. Ellis; Richard G. Bingham; Susan P. Worswick
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Paper Abstract

The design of the acquisition and guider (A&G) unit in use on the 4.2-m William Herschel Telescope at Observatorio del Roque de los Muchachos since May 1989 is described and illustrated with drawings. The Herschel A&G system is an enlarged and improved version of the A&G unit for the 1.0-m Kapetyn telescope at the same observatory (Ellis, 1983). Facilities provided include full-field guiding with minimal obstruction for spectrographs and wide-field instruments (using a CCD camera to image the guide star), an acquisition facility, spectrograph slit viewing by reflection, a TV camera with a 6-position filter wheel, lamps for spectral comparison and flat fielding, a full-field (15-arcmin) auxiliary focal position at right angles to the beam, polarization calibrators, two 8-position filter wheels, and two 5-filter filter slides. The A&G unit is housed in a cylindrical steel structure of diameter 150 cm and depth 65 cm; the mechanical operation of the components is briefly characterized.

Paper Details

Date Published: 1 July 1990
PDF: 9 pages
Proc. SPIE 1235, Instrumentation in Astronomy VII, (1 July 1990); doi: 10.1117/12.19142
Show Author Affiliations
Peter A. Ellis, Royal Greenwich Observatory (United Kingdom)
Richard G. Bingham, Royal Greenwich Observatory (United Kingdom)
Susan P. Worswick, Royal Greenwich Observatory (United Kingdom)

Published in SPIE Proceedings Vol. 1235:
Instrumentation in Astronomy VII
David L. Crawford, Editor(s)

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