Upscaled mission patch for STS-103. STS-103, the 96th launch of the Space Shuttle and the 27th launch of Space Shuttle Discovery, was Hubble Space Telescope Servicing Mission 3A ('SM3A'). It launched from Kennedy Space Center, Florida, on 19 December 1999 and returned on 27 December 1999 and was the last Shuttle mission of the 1990s. It was the only mission to span through Christmas after being delayed by 13 days for technical and weather reasons.

The primary objective of STS-103 was the Hubble Servicing Mission 3A.[4] STS-103 had four scheduled Extravehicular Activity (EVA) days where four crew members worked in pairs on alternating days to renew and refurbish the telescope.

Crew

Commander	Curtis L. Brown Jr. Sixth and last spaceflight
Pilot	Scott J. Kelly First spaceflight
Mission Specialist 1	John M. Grunsfeld Third spaceflight
Mission Specialist 2 Flight Engineer	Jean-François Clervoy, ESA Third and last spaceflight
Mission Specialist 3	/ Michael Foale Fifth spaceflight
Mission Specialist 4	Steven L. Smith Third spaceflight
Mission Specialist 5	Claude Nicollier, ESA Fourth and last spaceflight