HUBBLE SERVICES MISSION

Servicing Mission 1 (STS-61)

December 2-13, 1993

Mission Highlights:

  • COSTAR, Corrective Optics Space Telescope Axial Replacement installed, replacing High Speed Photometer (HSP)
  • Wide Field Planetary Camera 2 (WFPC2) replaced Wide Field Planetary Camera (WFPC)
  • Solar Arrays replaced with Solar Arrays 2 (SA2)
  • Replacement of #1 Solar Array Drive Electronics (SADE)
  • Replace the #2 and #3 Rate Sensor Unit (two gyros each)
  • Replacement of two Gyro Electronic Control Units, which direct the RSUs
  • Replacement of eight electrical fuses
  • Installation of two new magnetometers
  • Installation of Goddard High Resolution Spectrograph Redundancy (GHRS) kit
  • Installation of two protective covers over original magnetometers
Hubble in Service
Astronaut Jeffrey Hoffman removes Wide Field and Planetary Camera 1 (WFPC 1) during change-out operations.

Servicing Mission 2 (STS-82)

February 11-21, 1997

Mission Highlights:

  • Space Telescope Imaging Spectrograph (STIS) replaced Faint Object Spectrometer (FOS)
  • Near Infrared Camera/Multi-Object Spectrometer (NICMOS) replaced Goddard High Resolution Spectrograph (GHRS)
  • Replacement of Fine Guidance Sensor #1 with modified spare with added capability for ground-controlled alignment corrections
  • Addition of an Optical Control Electronics Enhancement Kit (OCE-EK)
  • Replacement of #1 Engineering Science Tape Recorder (ESTR) with digital Solid State Recorder (SSR) and replacement of #2 ESTR with a spare ESTR unit
  • Replacement #1 of 4 Reaction Wheel Assemblies (RWA), with refurbished spare
  • Replacement of Data Interface Unit (DIU) #2 with modified and upgraded spare unit
  • Replacement of #2 Solar Array Drive Electronics (SADE) with refurbished unit
  • Replacement of more durable covers on Magnetic Sensing System (MSS)
Hubble in Service
Astronauts perform the final phases of Servicing Mission 2 spacewalk duty using the Shuttle's Remote Manipulator System (RMS).

Servicing Mission 3A (STS-103)

December 19-27, 1999

Mission Highlights:

  • Replacement of all three Rate Sensing Units (RSUs), each of which contains two gyroscopes
  • Installation of new computer, 20 times faster with six times more memory than its predecessor
  • Replacement of original reel-to-reel data recorder with digital Solid State Recorder (SSR) which is faster, more reliable and can store 10 times as much data
  • Replacement of #2 of 3 Fine Guidance Sensors (FGS) with refurbished unit
  • Replacement of failed #2 of 2 S-Band Single Access Transmitter (SSAT) used to relay data to the ground
  • Installation six Voltage/Temperature Improvement Kits (VIKs) on wiring between Solar Arrays and each battery to control charging of Hubble's batteries
  • Installation of Shell/Shield Replacement Fabric (SSRF) over the original Multi-Layer Insulation on Hubble's forward shell and light shield to add thermal protection
  • Installation of Handrail Covers around the handrails above the Fine Guidance Sensor bay to prevent possible contamination to the Aft Shroud area from flaking handrail paint
  • Fit New Outer Blanket Layers (NOBLs) on equipment Bay 1
Hubble in Service
Astronauts C. Michael Foale, left, and Claude Nicollier (on Discovery's robotic arm) install a Fine Guidance Sensor (FGS) into a protective enclosure in the Shuttle's payload bay while orbiting above ocean and clouds.

Servicing Mission 3B (STS-109)

March 1-12, 2002

Mission Highlights:

  • Installation of Advanced Camera for Surveys (ACS), replacing the Faint Object Camera (FOC)
  • Installation of NICMOS Cooling System (NCS) comprised of two components, the NICMOS Cryogenic Cooler (NCC) and the NCS radiator, to revive the NICMOS instrument
  • Replace Solar Arrays 2 (SA2) with smaller, more efficient Solar Arrays 3 (SA3)
  • Replace the #2 of three Rate Sensor Units (each RSU contains two gyros)
  • Replace #1 of four Reaction Wheel Assemblies (RWA), part of Hubble's pointing control system, with a refurbished unit
  • Replace Power Control Unit (PCU) to take full advantage of additional power generated by the new solar arrays
  • Fit New Outer Blanket Layers (NOBLs) on Bays 1, 9 and 10
Hubble in Service
Astronauts replace one of Hubble's two solar arrays, and a Diode Box Assembly. The space walkers also did some prep work for STS-109's other sessions of extravehicular activities.

Servicing Mission 4 (STS-125)

May 11-24, 2009

Mission Highlights:

  • Replace Wide Field Planetary Camera 2 (WFPC2) with Wide Field Camera 3 (WFC3)
  • Remove the Corrective Optics Space Telescope Axial Replacement (COSTAR) and install the Cosmic Origins Spectrograph (COS) in its place
  • Repair the Space Telescope Imaging Spectrograph (STIS)
  • Repair the Advanced Camera for Surveys (ACS)
  • Replace gyroscopes
  • Replace one Fine Guidance Sensor (FGS)
  • Replace batteries
  • Install New Outer Blanket Layers (NOBL) on bays 5, 7 and 8
  • Install Soft Capture Mechanism (SCM)
  • Replace Science Instrument Control and Data Handling (SIC&DH) unit
Hubble in Service
Astronauts replace one of Hubble's two solar arrays, and a Diode Box Assembly. The space walkers also did some prep work for STS-109's other sessions of extravehicular activities.