... The Space Astronomy Laboratory is building an attitude determination and digital imaging system with embedded compression. The attitude determination system uses a 30-square-degree field of view and an embedded star catalog to determine the Right Ascension and Declination of its line of sight to better than 5arcseconds. ... The ST5000 can determine its attitude with respect to an absolute coordinate system (say, FK5 Equatorial) by analyzing the star patterns in a single frame. ...