||This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (May 2008)|
|Mission duration||10 days, 22 hours, 11 minutes, 09 seconds|
|Distance travelled||6,300,000 kilometres (3,900,000 mi)|
|Spacecraft||Space Shuttle Columbia|
|Start of mission|
|Launch date||1 March 2002 11:22:02UTC|
|Launch site||Kennedy LC-39A|
|End of mission|
|Landing date||12 March 2002 09:33:10UTC|
STS-109 (SM3B) was a Space Shuttle mission that launched from the Kennedy Space Center on 1 March 2002. It was the 108th mission of the Space Shuttle program, the 27th flight of the orbiter Columbia and the fourth servicing of the Hubble Space Telescope. It was also the last successful mission of the orbiter Columbia before the ill-fated STS-107 mission, which culminated in the Columbia Disaster.
The Hubble Space Telescope (HST) was placed in orbit during mission STS-31 on 25 April 1990. Initially designed to operate for 15 years, plans for periodic service and refurbishment were incorporated into its mission from the start. After the successful completion of the second planned service mission (SM2) by the crew of STS-82 in February 1997, three of HST's six gyroscopes failed. NASA decided to split the third planned service mission into two parts, SM3A and SM3B. A fifth and final servicing mission, STS-125 (SM4) launched 11 May 2009 The work performed during SM4 is expected to keep HST in operation through 2014.
|Commander||Scott D. Altman
|Pilot||Duane G. Carey
|Mission Specialist 1||John M. Grunsfeld
|Mission Specialist 2||Nancy J. Currie
|Mission Specialist 3||Richard M. Linnehan
|Mission Specialist 4||James H. Newman
|Mission Specialist 5||Michael J. Massimino
Mission parameters 
- Orbiter liftoff: 116,989 kg (257,920 lb)
- Orbiter landing: 100,564 kg (221,710 lb)
- Perigee: 486 km (302 mi)
- Apogee: 578 km (359 mi)
- Inclination: 28.5°
- Period: 95.3 min
|EVA||Team||Start – UTC||End – UTC||Duration|
|4 March 2002, 06:37||4 March 2002, 13:38||7:01|
|5 March 2002, 06:40||5 March 2002, 13:56||7:16|
|6 March 2002, 08:28||6 March 2002, 15:16||6:48|
|7 March 2002, 09:00||7 March 2002, 16:18||7:18|
|8 March 2002, 08:46||8 March 2002, 16:18||7:32|
Mission highlights 
The purpose of STS-109 was to service the Hubble Space Telescope (HST). It was Columbia's first flight following an extensive two and a half year modification period (its most recent mission being STS-93). During the mission they installed a new science instrument, the Advanced Camera for Surveys (ACS), new rigid Solar Arrays (SA3), new Power Control Unit (PCU) and a new Cryocooler for the Near Infrared Camera and Multi-Object Spectrometer (NICMOS). STS-109 also reboosted HST to a higher orbit.
The STS-109 astronauts performed a total of five spacewalks in five consecutive days to service and upgrade the Hubble Space Telescope. The spacewalkers received assistance from their crewmates inside Columbia. Currie operated the Shuttle's robot arm while Altman was her backup. Carey and Altman documented the EVA activities with video and still images.
Accomplishments of the spacewalks included the installation of new solar arrays, a new camera, a new Power Control Unit, a Reaction Wheel Assembly and an experimental cooling system for the NICMOS unit. STS-109 accumulated a total of 35 hours, 55 minutes of EVA time. Following STS-109, a total of 18 spacewalks had been conducted during four Space Shuttle missions to service Hubble (the others being STS-61, STS-82, STS-103 and STS-125) for a total of 129 hours, 10 minutes by 14 different astronauts.
STS-109 is considered a night launch, as sunrise was at 6:47 am, and Columbia launched at 6:22 am EST, 25 minutes before sunrise.
|Attempt||Planned||Result||Turnaround||Reason||Decision point||Weather go (%)||Notes|
|1||21 Feb 2002, 10:22:00 am||scrubbed||---|||
|2||28 Feb 2002, 6:48:00 am||scrubbed||6 days, 20 hours, 26 minutes||technical||21 Feb 2002, 10:00 am||60%||wrong bearings installed on shuttles main landing gear|
|3||1 Mar 2002, 6:22:02 am||success||0 days, 23 hours, 34 minutes|||
See also 
- Space science
- Space Shuttle
- List of space shuttle missions
- List of human spaceflights chronologically
- "Mission STS-109". NASA. Retrieved 1 March 2009.
- "The Hubble Space Telescope: SM3B". NASA. Retrieved 1 March 2009.[dead link]
- "The Hubble Space Telescope: Deployment". NASA. Retrieved 1 March 2009.[dead link]
- "Servicing History and Long-Term Plans" (PDF). NASA. June 1993. Retrieved 1 March 2009.
- "The Hubble Space Telescope: SM3A". NASA. Retrieved 1 March 2009.[dead link]
- "STS-125: Final Shuttle Mission to Hubble Space Telescope". NASA. Retrieved 1 March 2009.
- "The Hubble Space Telescope: SM4". NASA. Retrieved 1 March 2009.[dead link]
- "STS-109 Mission Archives". NASA.
- "STS-109 Status Report #14". NASA. 7 March 2002.
- "STS-109 Status Report #16". NASA. 8 March 2002.
- "Launch officially slips to Feb. 28". CBS News. 14 January 2002. Retrieved 30 August 2009.
- "Cold front threatens shuttle launch". CBS News. 26 February 2002. Retrieved 30 August 2009.
- "Columbia rockets into space". CBS News. 1 March 2002. Retrieved 30 August 2009.
- Status reports – Detailed NASA status reports for each day of the mission.
- NASA mission summary
- STS-109 reentry pictures
- ESA/Hubble mission summary
- STS-109 Video Highlights