STS-123 was a Space Shuttle mission to the International Space Station (ISS) which was flown by Space Shuttle Endeavour. STS-123 was the 1J/A ISS assembly mission. The original launch target date was February 14, 2008, but after the delay of STS-122, the shuttle was launched on March 11, 2008. It was the twenty-fifth shuttle mission to visit the ISS, and delivered the first module of the Japanese laboratory, Japanese Experiment Module (Kibō), and the Canadian Special Purpose Dexterous Manipulator, (SPDM) Dextre robotics system to the station. The mission duration was 15 days and 18 hours, and it was the first mission to fully utilize the Station-to-Shuttle Power Transfer System (SSPTS), allowing space station power to augment the shuttle power systems. The mission set a record for a shuttle's longest stay at the ISS. Crew Mission payloads STS-123 delivered the pressurized section of the Japanese Experiment Logistics Module (ELM-PS) as well as the Special Purpose Dexterous Manipulator (SPDM) to the International Space Station. The SPDM was delivered disassembled on a Spacelab Pallet (SLP) and assembled during three spacewalks once it was at the station. Shuttle processing In August 2007, STS-123 crew members participated in crew equipment interface tests for the ELM-PS at Kennedy Space Center. Processing continued on schedule for Endeavour'''s launch in early 2008. NASA engineers applied the same ECO sensor modifications used on STS-122's external tank, to Endeavour's tank. In January, a HEPA filter contamination issue was discovered, but was resolved and with no impact to the mission. On February 11, 2008, Endeavour was "rolled over" to the Vehicle Assembly Building in preparation for mating with the external tank and solid rocket boosters. On February 13, 2008, Endeavour was successfully mated with its external tank and solid rocket boosters, and was rolled out to Launch Pad 39A in the early hours of February 18, 2008, for its planned launch on March 11, 2008. The Terminal Countdown Demonstration Test, a full dress rehearsal for launch with the crew, took place February 23–25, 2008. Mission background The mission marked: Longest shuttle mission to the ISS to date 153rd NASA crewed spaceflight 122nd Space Shuttle flight since STS-1 97th post-Challenger mission 9th post-Columbia mission 30th Night Launch 16th KSC Shuttle Night Landing, 22nd Shuttle Night Landing Overall 21st launch of Endeavour 2nd mission of Endeavour since Return to Flight Mission timeline Flight days are based on the days as experienced by the