1 National Space Institute, Technical University of Denmark2 Astrophysics, National Space Institute, Technical University of Denmark3 National Taiwan University4 Yonsei University5 Ewha Womans University6 University of Paris-Sud - University of Paris XI7 Instituto de Astrofísica de Andalucía8 National Space Organization9 Korea Institute of Industrial Technology10 Korea Advanced Institute of Science & Technology11 University of Valencia12 National United University13 Sungkyunkwan University14 Moscow State University15 National Taiwan University16 Ewha Womans University17 Sungkyunkwan University18 Moscow State University
The Ultra-Fast Flash Observatory (UFFO) is a space observatory for optical follow-ups of gamma ray bursts (GRBs), aiming to explore the first 60 seconds of GRBs optical emission. UFFO is utilized to catch early optical emissions from GRBs within few sec after trigger using a Gimbal mirror which redirects the optical path rather than slewing entire spacecraft. We have developed a 15 cm two-axis Gimbal mirror stage for the UFFO-Pathfinder which is going to be on board the Lomonosov satellite which is to be launched in 2013. The stage is designed for fast and accurate motion with given budgets of 3 kg of mass and 3 Watt of power. By employing stepping motors, the slewing mirror can rotate faster than 15 deg/sec so that objects in the UFFO coverage (60 deg × 60 deg) can be targeted in ~1 sec. The obtained targeting resolution is better 2 arcmin using a close-loop control with high precision rotary encoder. In this presentation, we will discuss details of design, manufacturing, space qualification tests, as well as performance tests.
E a S Publications Series, 2013, Vol 61, p. 573-577