STS-49
The primary goal of its nine-day mission was to retrieve an Intelsat VI satellite, Intelsat 603, which failed to leave Low Earth orbit two years before, attach it to a new upper stage, and relaunch it to its intended geosynchronous orbit.After several attempts, the capture was completed with the only three-person extravehicular activity (EVA) in space flight history.The capture required three EVAs: a planned one by astronauts Thuot and Hieb, who were unable to attach a capture bar to the satellite from a position on the RMS (Canadarm); a second unscheduled but identical attempt the following day; and finally, an unscheduled but successful hand capture by Thuot, Hieb and Akers as commander Brandenstein delicately maneuvered the orbiter to within a few feet of the 4,215 kg (9,292 lb) communications satellite.A planned EVA also was performed by astronauts Thornton and Akers as part of the ASEM experiment to demonstrate and verify maintenance and assembly capabilities for Space Station Freedom.Other "payloads of opportunity" experiments conducted included Commercial Protein Crystal Growth (CPCG), Ultraviolet Plume Imager (UVPI) and the Air Force Maui Optical Station (AMOS) investigation.