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Abstract
This paper describes the series of three orbiting high energy astronomy observatories that comprise the High Energy Astronomy Observatory (HEAO) program of the National Aeronautics and Space Administration (NASA). The basis and enthusiasm of the scientific community for this program is presented. The HEAO program is a leader in the low cost approach for unmanned scientific investigations and emphasis is given to engineering design and test philosophies being practiced in support of this approach. Several unique designs and the attitude control and determination system (ACDS) used for observatory scan rotation of the first and third missions and for precision pointing on the second mission are described. Finally, preliminary results from the first mission, launched on August 12, 1977, are reviewed.
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