Omega Prime: the wide-field near-infrared camera for the 3.5-m telescope of the Calar Alto Observatory

Peter Bizenberger; Mark J. McCaughrean; Christoph Birk; Dave Thompson; Clemens Storz

doi:10.1117/12.317219

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21 August 1998 Omega Prime: the wide-field near-infrared camera for the 3.5-m telescope of the Calar Alto Observatory

Peter Bizenberger, Mark J. McCaughrean, Christoph Birk, Dave Thompson, Clemens Storz

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Proceedings Volume 3354, Infrared Astronomical Instrumentation; (1998) https://doi.org/10.1117/12.317219
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

Omega Prime is a wide-field near-IR camera for the prime focus of the Calar Alto 3.5 m telescope in Spain. The detector is a 1024 X 1024 pixel HAWAII array made by Rockwell. The image scale is 0.4 arcsec/pixel, giving a field of view of 6.8 by 6.8 arcmin. In order to maximize the throughput, the optics were designed as a prime focus corrector with only three lenses. This simple design without a cold pupil provides an excellent image quality over the entire field of view. To reduce thermal background at wavelengths longer than 2.2 micrometers , Omega Prime has a series of cold internal baffles and an additional torodial mirror outside the dewar. This annular reflector causes detector pixels to 'see' mostly the cold interior of the camera. The camera has been in operation since May 1996 and has been used for a variety of scientific programs. Including a very deep K survey covering 1000 square arcmin to a 5 (sigma) limit for point-sources of 20.5 magnitude.

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Peter Bizenberger, Mark J. McCaughrean, Christoph Birk, Dave Thompson, and Clemens Storz "Omega Prime: the wide-field near-infrared camera for the 3.5-m telescope of the Calar Alto Observatory", Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); https://doi.org/10.1117/12.317219

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