Acquisition and guider unit for the Cassegrain focus of the 4.2m William Herschel Telescope

Details Acquisition and guider unit for the Cassegrain focus of the 4.2m William Herschel Telescope Acquisition and guider unit for the Cassegrain focus of the 4.2m William Herschel Telescope

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1235..777e&link_type=abstract

IN: Instrumentation in astronomy VII; Proceedings of the Meeting, Tucson, AZ, Feb. 13-17, 1990 (A91-29601 11-35). Bellingham, WA

Physics

Optics

Automatic Control, Cassegrain Optics, Guidance Sensors, Telescopes, Charge Coupled Devices, Design Analysis, Television Cameras

Scientific paper

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.

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