As a requirement for the Small Astonomy Satellite-B (SAS-13), a. star sensor was designed to provide satel lite positional data to an accuracy of 3 are minutes for satellite spin rates of 1/12 rpm. and 1 rpm. The star sen-sor is required to detect stars having a +4 visual magnitude during the sun lit portion of the orbit. The space-craft orientation, can be anything achievable in its near equatorial 500 Km, orbit. The design of the star sensor re sulted in an instrument which weighs 6.5 lbs., consumes 0.4, watts and op-erates at spin rates ranging from 1/12 rpm to 3 rpm. The instrument design incorporates optical features provid-ing excellent uniformity of resLonse across the 5° X 10° field of view. The basic design is intended as a building block, which can be utilized throughout the SAS series of space craft. Fig. 1 is a photo of the star sensor package.