ABSOLUTE CALIBRATION WORK AT PALOMAR MOUNTAIN.
Rept. no. 4 (Final), 1 Apr 66-31 Aug 68,
MOUNT WILSON AND PALOMAR OBSERVATORIES PASADENA CALIF
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A four inch hermetically sealed reflecting telescope has been attached to the prime-focus scanner to provide an observing system for absolute calibration work. Light sources, including a platinum and copper furnace, are observed at a distance of approximately 1200 feet. Since the telescope focal length is only 13 inches these sources look like stars. Thus bright stars such as alpha Lyr are compared directly with the light sources under identical instrumental conditions. It has been found that horizontal extinction can be abnormally large therefore it is measured several times each night. The absolute calibration is being derived at present from 3500 A to 11000 A and will be extended to 3200 A as soon as possible. Author