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STS-125 is the next Space Shuttle mission to be launched. STS-125 will be the fifth and final servicing mission to the Hubble Space Telescope (HST). The mission will be flown by , with ready to launch in case a rescue mission is needed. STS-125 is currently scheduled by NASA to launch October 8, 2008 due to external tank manufacturing delays.

Atlantis will carry two new instruments to the HST, in addition to a replacement Fine Guidance Sensor, six new gyroscopes and batteries to allow the telescope to continue to function at least through 2013. The crew will also install a new thermal blanket layer to provide improved insulation, and a "Soft-Capture mechanism" to aid in the safe de-orbiting of the spacecraft by an unmanned spacecraft at the end of its operational lifespan.

Otherwise known as Hubble Space Telescope Servicing Mission 4 (HST-SM4), the mission will mark the thirtieth flight of Space Shuttle Atlantis, the last planned manned mission to the space telescope, and the final flight of a Space Shuttle not related to the assembly of the International Space Station (ISS). The mission will be the first flight of Atlantis since STS-122, and the first flight of Atlantis not to visit a Space Station since STS-66 in 1994. It will be the first Shuttle mission not related to the ISS since STS-107, which ended in the Columbia accident. Its completion will leave nine flights remaining in the Space Shuttle program until its end in 2010, including two Contingency Logistic Flights.

Due to the large differences between the orbit of the International Space Station and the HST, Atlantis will be unable to reach the safe-haven of the ISS in the event of her heat shield becoming damaged upon launch. Therefore the mission will require Endeavour to be ready on launch pad 39B for immediate flight on the STS-400 Launch On Need (LON) rescue mission throughout Atlantis' mission. Due to the logistics of STS-125, Endeavour will require rollout two weeks before Atlantis. It will be the final time launch pads 39A and 39B are occupied with shuttles at the same time.

As of June 19th, 2008, Shuttle Atlantis has her external airlock and Space Shuttle Main Engine (SSME) 1 & 3 installed. Work continues on installing SSME #2 and outfitting the payload bay and airlock in preperation of Atlantis' last flight to the Hubble Space Telelscope.

The crew of Atlantis arived on Monday at KSC for Crew Equipment Interface Test. This allows the STS-125 crew to get familiar with the orbiter and the hardware they will be using during the flight.

Crew

NASA announced the crew selected for STS-125 on October 31, 2006.

Scott D. Altman (4) - Commander
Gregory C. Johnson (1) - Pilot
Michael T. Good (1) - Mission Specialist 1
K. Megan McArthur (1) - Mission Specialist 2
John M. Grunsfeld (5) - Mission Specialist 3
Michael J. Massimino (2) - Mission Specialist 4
Andrew J. Feustel (1) - Mission Specialist 5

Number in parentheses indicates number of spaceflights by each individual prior to, and including this mission.

Crew notes

The crew of STS-125 includes three astronauts who have previous experience with servicing Hubble. Altman visited Hubble as commander of STS-109, the fourth Hubble servicing mission in 2002. Grunsfeld, an astronomer, has serviced Hubble twice, performing a total of five spacewalks on STS-103 in 1999, and STS-109. Massimino served with both Altman and Grunsfeld on STS-109, and performed two spacewalks to service the telescope.

Mission parameters

Mass: TBD
Perigee: 486 km
Apogee: 578 km
Inclination: 28.5°
Period: 97 min

Mission payloads

STS-125 will carry the "Soft-Capture Mechanism," and install it onto the telescope. This will enable a spacecraft to be sent to the telescope to assist in its safe de-orbit at the end of its life. It is a circular mechanism containing structures and targets to aid docking.

The mission will add two new instruments to Hubble: The Cosmic Origins Spectrograph, which will be the most sensitive ultraviolet spectrograph installed on the telescope. Its far-UV channel will be 30 times more sensitive than previous instruments and the near-UV will be twice as sensitive. The second instrument, the Wide Field Camera 3, is a panchromatic wide-field camera that can record a wide range of wavelengths, including infrared, visible, and ultraviolet light.

The infrastructure of the telescope will be maintained and upgraded by replacing a "Fine Guidance Sensor" that controls the telescope's directional system, and installing a set of six new gyroscopes, as well as replacing batteries and installing a new outer blanket layer to provide improved insulation.

Extra-vehicular activities

Five back-to-back EVAs are planned:

EVA-1: Installation of three rate sensing units (six gyros) and one battery module (three batteries)
EVA-2: Installation of the Cosmic Origins Spectrograph and the second battery module
EVA-3: Installation of the Wide Field Camera 3 and insulation repairs
EVA-4: Space Telescope Imaging Spectrograph repair and installation of a cooling system
EVA-5: Installation of Fine Guidance Sensor No. 3 and attempted repair of the Advanced Camera for Surveys (ACS).

NASA has announced and trained the following space walkers:

John Grunsfield; EVAs 1, 3 and 5
Andrew Feustel; EVAs 1, 3 and 5
Michael Massimino; EVAs 2 and 4
Michael Good; EVAs 2 and 4

Mission background

STS-125 (HST-SM04) was originally assigned to Discovery, with a launch date no earlier than May of 2008. This would move the mission ahead of STS-119, ISS Assembly flight 15A. STS-125 will be the first visit to the Hubble Space Telescope for Atlantis, although the telescope has been previously serviced twice by Discovery, and once each by Columbia and Endeavour.

STS-125 was further delayed to October 2008 due to manufacturing delays on external tanks for future space shuttle missions. Lockheed Martin experienced delays during the production changes to make new external tanks with all the enhancements recommended by the Columbia Accident Investigation Board, making it impossible for them to produce two tanks for the STS-125 mission—one for Atlantis, and one for Endeavour for an emergency rescue mission, if necessary—in time for the original August launch date.

STS-125 was originally scheduled to be the ISS assembly mission ISS-1J. The mission would have delivered the Kibo Japanese Experiment Module (JEM) and JEM's specialized Remote Manipulator System to the station. Columbia was originally planned to fly the fifth Hubble mission, as Columbia was not the optimum orbiter for ISS assembly due to the weight of the orbiter.

IMAX movie

At the end of September, 2007, Warner Bros. Pictures and IMAX Corporation announced that in cooperation with NASA, an IMAX 3D camera will travel to the Hubble telescope with STS-125 for production of a new film that will chronicle the story of the Hubble telescope. IMAX has made a number of movies centered around space, including Destiny in Space, The Dream is Alive, Mission to Mir, Blue Planet, Magnificent Desolation, and the first trip of IMAX to the ISS in 2001, to make "Space Station 3D".

Contingency mission

STS-400 is the flight designation given to the Contingency Shuttle Crew Support mission which would be launched in the event Atlantis becomes disabled during STS-125. To preserve NASA's post-Columbia requirement of having shuttle rescue capability, a second shuttle will be on launch pad 39-B at the time of STS-125's launch. This has imposed a constraint on deactivation and conversion of pad 39B for Ares I flight tests. Due to the orbit and inclination of Hubble, Atlantis would be unable to use the ISS as a "safe haven" in the event of structural or mechanical failure.

NASA had contingency rescue missions on standby for all nine flights conducted between the fatal Columbia flight and STS-125.