An attitude control testbed for JDEM

A mission critical goal of the JDEM mission is to resolve distant galaxies both optically and spectroscopically. In order to achieve this goal, the spacecraft must make observations at the diffraction limit. A full scale attitude control testbed was developed to determine the ability of preliminary designs to meet stringent attitude control requirements. We demonstrate our ability to control a realistic spacecraft structure to ~20 mas. Expected reaction wheel feedback effects are observed and mitigation discussed.