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.