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The SAS-3 X-ray observatory

The SAS-3 satellite is an X-ray observatory with three major objectives: to determine the location of bright X-ray sources to an accuracy of 15 arc-seconds; to study a selected set of sources over a wide energy range, from 0.1 to 55 keV; and to search the sky continuously for X-ray novae, flares, and unexpected phenomena. The scientific portion of the observatory was designed and built for NASA by the Laboratory for Space Experiments and the Center for Space Research of M.L T. (Massachusetts Institute of Technology). The scientific experiment was mated with a spacecraft designed and built at APL, to form the SAS-3 payload (Explorer 53).