ann2003 — Announcement
ESA-Built Hardware on Hubble Reaches 1 Million Degree Slew Milestone
5 March 2020: The power for the NASA/ESA Hubble Space Telescope's scientific discoveries comes from solar cells. Designing and constructing Hubble's first two sets of solar cell arrays, and the accompanying Solar Array Drive Mechanism (SADM) and Solar Array Drive Electronics (SADE), constituted a huge technological achievement for the European Space Agency (ESA) and European industry. After an in-orbit life of more than 10 years, the ESA-built solar arrays were replaced by new, more powerful arrays. However, ESA’s SADM and SADE, which control the telescope’s current solar arrays, are still on board and under ESA purview. They are among the telescope’s oldest subsystems. In December 2019, the accumulated slew angles of the SADM had reached 1 000 000 degrees of travel. This travel began accumulating on this day 18 years ago, 5 March 2002, when ESA’s solar arrays were replaced during the Space Shuttle Servicing Mission 3B. “This milestone is a special occasion …