Endeavour docked to ISS.jpg
Space Shuttle Endeavour docked to the ISS during STS-134, as seen from the departing Soyuz TMA-20 on May 23, 2011.
Mission typeISS assembly
Mission duration15 days, 17 hours, 38 minutes, 51 seconds
Distance travelled10,477,185 km (6,510,221 mi)
Spacecraft properties
SpacecraftSpace Shuttle Endeavour
Launch mass2,052,443 kilograms (4,524,863 lb) (total)
121,830 kilograms (268,580 lb) (orbiter)[1][2]
Landing mass92,240 kilograms (203,354 lb)[1][2]
Payload mass15,770 kilograms (34,760 lb)[1][2]
Crew size6
MembersMark E. Kelly
Gregory H. Johnson
Michael Fincke
Roberto Vittori
Andrew J. Feustel
Gregory Chamitoff
Start of mission
Launch date16 May 2011, 12:56:28 (2011-05-16UTC12:56:28Z) UTC[3][4][5][6]
Launch siteKennedy LC-39A
End of mission
Landing date1 June 2011, 06:35 (2011-06-01UTC06:36Z) UTC[7]
Landing siteKennedy SLF Runway 15
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee321 kilometres (199 mi)[8]
Apogee343 kilometres (213 mi)[8]
Inclination51.6 degrees
Period91.17 minutes[8]
Epoch17 May 2011[8]
Docking with ISS
Docking portPMA-2
(Harmony forward)
Docking date18 May 2011, 10:14 UTC
Undocking date30 May 2011, 03:55 UTC
Time docked11 days, 17 hours, 41 minutes
STS-134 patch.pngSTS-134 Official Crew Photo.jpg
Pictured clockwise in the STS-134 crew portrait are NASA astronauts Mark Kelly (bottom center), commander; Gregory H. Johnson, pilot; Michael Fincke, Greg Chamitoff, Andrew Feustel and European Space Agency's Roberto Vittori, all mission specialists.
← STS-133
STS-135 →

STS-134 (ISS assembly flight ULF6)[9] was the penultimate mission of NASA's Space Shuttle program and the 25th and last spaceflight of Space Shuttle Endeavour.[10] This flight delivered the Alpha Magnetic Spectrometer and an ExPRESS Logistics Carrier to the International Space Station.[11] Mark Kelly served as the mission commander. STS-134 was expected to be the final space shuttle mission if STS-135 did not receive funding from Congress. However, in February 2011, NASA stated that STS-135 would fly "regardless" of the funding situation.[12][13] STS-135, flown by Atlantis, took advantage of the processing for STS-335, the Launch On Need mission that would have been necessary if the STS-134 crew became stranded in orbit.

Changes in the design of the main payload, AMS-02, as well as delays to STS-133, led to delays in the mission. The first launch attempt on 29 April 2011 was scrubbed at 12:20 pm by launch managers due to problems with two heaters on one of the orbiter's auxiliary power units (APU). Endeavour launched successfully at 08:56:28 EDT (12:56:28 UTC)[14] on 16 May 2011,[15] and landed for the final time on 1 June 2011.[16]


Mission poster, based on a Star Trek promotional poster.[17][18]
The crew arrive at the Shuttle Landing Facility in T-38 jets on 26 April 2011.

NASA announced the STS-134 crew on 10 August 2009.[19]

Position Astronaut
Commander United States Mark E. Kelly
Fourth and last spaceflight
Pilot United States Gregory H. Johnson
Second and last spaceflight
Mission Specialist 1 United States Michael Fincke
Third spaceflight
Mission Specialist 2 Italy Roberto Vittori, ESA
Third spaceflight
Mission Specialist 3 United States Andrew J. Feustel
Second spaceflight
Mission Specialist 4 United States Gregory Chamitoff
Second and last spaceflight
  • On 13 January 2011, after the 2011 Tucson shooting in which Congresswoman Gabrielle Giffords, Mark Kelly's wife, was critically wounded, NASA named Frederick W. Sturckow as backup commander for this mission.[20]
  • Roberto Vittori from Italy was the last non-U.S. astronaut to fly with the shuttle.
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