![]() ![]() The Hubble mission was a joint NASA-ESA ( European Space Agency) effort going back to the late 1970s. It was designed to operate above the Earth's turbulent and obscuring atmosphere to observe celestial objects at ultraviolet, visible and near-infrared wavelengths. The main purpose of this mission was to deploy Hubble. Engineers ordered the valve closed and the countdown continued. On launch day, the countdown was briefly halted at T-31 seconds when Discovery 's computers failed to shut down a fuel valve line on ground support equipment. The APU was eventually replaced and the Hubble Space Telescope's batteries were recharged. A launch attempt on April 10, 1990, was scrubbed at T-4 minutes for a faulty valve in auxiliary power unit (APU) number one. Mission highlights Space Shuttle Discovery launches from LC-39B for STS-31 with Columbia on LC-39A in preparation for STS-35. Young was originally assigned to command this mission, which would have been his seventh spaceflight, but was reassigned to an administrative position and was replaced by Loren J. This mission was originally to be flown in August 1986 as STS-61-J using Atlantis, but was postponed due to the Challenger disaster. Discovery 's launch marked the first time since January 1986 that two Space Shuttles had been on the launch pad at the same time – Discovery on 39B and Columbia on 39A.Ĭrew seating arrangements Seat As STS-51-L was also designated STS-33, future flights with the previous STS-26 through STS-33 designators would require the R in their documentation to avoid conflicts in tracking data from one mission to another.ĭiscovery 's crew deployed the Hubble Space Telescope on April 25, 1990, and then spent the rest of the mission tending to various scientific experiments in the Shuttle's payload bay as well as operating a set of IMAX cameras to record the mission. The mission used the Space Shuttle Discovery (the tenth mission for this orbiter), which lifted off from Launch Complex 39B on April 24, 1990, from Kennedy Space Center, Florida.įollowing the Challenger accident clarification was required on mission numbering. ![]() The primary purpose of this mission was the deployment of the Hubble Space Telescope (HST) into low Earth orbit. STS-31 was the 35th mission of NASA's Space Shuttle program. ![]()
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