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There have been 5 total HST Servicing Missions, though SM1 is the only one considered a "Repair" mission as well. I was privileged to work on all but the final one.

NASA preferred to use either Discovery or Endeavour for repairs since they have larger bays and can hold more equipment. The missions were:

First Servicing/Repair Mission - SM-1/1993: STS-61 - Biggest repair was COSTAR, the corrective optics that compensated for the mirror flaw. I worked on the electronics for it.

Second Servicing Mission - SM-2/1997 - STS-82 - Added STIS, NICMOS camera, Solid State Recorder (where today's SSD technology came from), Fine Guidance Sensor, and electronic upgrades. I worked on a LOT of stuff for that mission, including new tools used to service it.

Third Servicing Mission - SM-3A/1999 - STS-103 - Originally designed to be just one mission, SM3 was split into two separate missions after it was determined within a few months of mission launch that 3 of HST's 4 gyros had failed. HST's gyros are essential for telescope pointing and maintaining control during observations; without them, HST is essentially space junk.

A quick gyro replacement mission was called up, and most of the equipment slated for installation on the original mission had to wait until 3B.

A bit of trivia on the 3rd mission; originally, mission patches and decals were made showing just the original SM3 mission and insignia. It was later changed to 2 separate missions with different designations, crew, and insignia, so if you ever run across the original, it's a collector's item. I still have several SM3 decals from before the mission change.

Fourth Servicing Mission - SM-3B/2002 - STS-109 - Installed the NICMOS Cooling System and associated hardware, Advanced Camera for Surveys, and other items. The NCS program took a lot of my time, and was the last major HST program I worked on. You can see pics of it on my bio page.

Fifth Servicing Mission - SM-4/2009 - STS-125 - Installed Cosmic Origins Spectograph and Wide-Field Camera 3, the replacement for the WFPC (Wide Field Planetary Camera) installed on SM-2. Repairs to STIS and the ACS were also performed.

For more info, see the NASA link below.

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Q: What space shuttle mission repaired the HST?
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Continue Learning about Astronomy

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The Hubble Space Telescope or HST was launched aboard the space shuttle Dscovery during mission STS-31 on the 24th of April 1990.


How was the Hubble Telescope transported into orbit?

HST was transported into orbit aboard Space Shuttle Discovery (mission STS-31) in April 1990. It was scheduled to be orbited earlier, but the shutdown of the Shuttle program following the Challenger accident delayed its deployment, not to mention increasing its maintenance cost because it sat on the ground (about 1 million per day). Astronauts successfully deployed and boosted HST into its orbit altitude of 569nm.Though any of the Shuttles can perform an HST Servicing Mission, Shuttles Discovery and Endeavour are usually preferred due to their larger payload bays (we can put more stuff in it).To date, HST has been in orbit and providing science data for over 20 years.


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When was the hubble telescope repaired?

The HST First Servicing Mission occurred over a 10 day period on board Space Shuttle Endeavour (STS-61) in December, 1993 - all of us on the HST program held our breath as the Astronauts installed COSTAR, the corrective optical unit that compensated for the minor defect in the primary mirror (4 microns, 1/5 the thickness of a human hair). In addition to COSTAR, the solar arrays were replaced, all 4 gyros, RIU's (Telemetry interface units), power units, magnetometers, and the HST original data tape recorder. It was replaced with a unit called the Solid State Recorder, which is the technology developed by NASA that today's SSD's and flash drives comes from. Mission Specialists/Astronauts Story Musgrave, Kathryn Thornton, Thomas Akers, and Jeffrey Hoffman repaired HST over an 8 day mission, comprising a total of 5 spacewalks. One problem occurred when Story Musgrave tried to tighten the bolts on the main doors that open up to HST's main instrument bay - the doors wouldn't quite close shut. He eventually got them to close and bolt, but it was a tense moment. The result was nothing short of spectacular, not to mention those of us in the program being able to breathe a sigh of relief.


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