STS-103 (97)

Discovery (27)
Pad 39-B (45) (estimated)
97th Shuttle Mission (estimated)
27th Flight OV-103 (estimated)

Crew:

Curtis L. Brown (6), Mission Commander
Scott J. Kelly (1), Pilot
Steven L. Smith (3), Mission Specialist
C. Michael Foale (5), Mission Specialist
John M. Grunsfeld (3), Mission Specialist
Claude Nicollier (4), Mission Specialist (ESA)
Jean-Francois Clervoy (3), Mission Specialist (ESA)

Milestones:

OPF --
VAB --
PAD --

Payload:

Hubble Servicing Mission 3

Mission Objectives:

Service the Hubble Space Telescope.

NASA officials decided to move up part of the servicing mission that had been scheduled for June 2000 after three of the telescope's six gyroscopes failed. Three gyroscopes must be working to meet the telescope's very precise pointing requirements, and the telescope's flight rules dictated that NASA consider a "call-up" mission before a fourth gyroscope failed. Having fewer than three working gyroscopes would preclude science observations, although the telescope would remain safely in orbit until a servicing crew arrived.

In addition to replacing all six gyroscopes on the October flight, the crew will replace a guidance sensor and the spacecraft's computer. The new computer will reduce the burden of flight software maintenance and significantly lower costs. A voltage/temperature kit will be installed to protect spacecraft batteries from overcharging and overheating when the spacecraft goes into safe mode. A new transmitter will replace a failed spare currently aboard the spacecraft, and a spare solid state recorder will be installed to allow efficient handling of high- volume data. Both missions will replace telescope insulation that has degraded. The insulation is necessary to control the internal temperature on the Hubble.

Launch:

Launch October 14, 1999 TBD (ESTIMATED).

Orbit:

Altitude: 317nm
Inclination: 28.45
Orbits:
Duration: 10 days, hours, minutes. (Estimated)
Distance: miles

Hardware:

SRB:
SRM:
ET :
MLP :
SSME-1: SN-
SSME-2: SN-
SSME-3: SN-

Landing:

October 24, 1999 TBD KSC (Estimated)

Mission Highlights:

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