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The JEM (Japanese Experiment Module) - a.k.a. Kibo - consisting of three modules, is the japanese segment  of the international space station ISS.

Exposed Facility (EF) is located outside the ISS and is exposed to outer space all the time. On ISS, the EF and the truss facilities are the only locations where the space environment can directly be utilized. Astronauts exchange experiment payloads or devices from the pressurized module mainly utilizing the Kibo manipulator.

The world's largest wide-angle X-ray camera will be mounted on the platform, to make observations of space, examine the phenomena beyond our galaxy, and refine our map of the distribution of the galaxies.

Another payload to be mounted at the JEM-EF is the OCO 3 instrument, which is planned for the 2018 timeframe.

Nation: Japan
Type / Application: Space station laboratory module
Operator: ESA
Equipment: ?
Propulsion: None
Orbit: 400 km × 400 km, 51.6 (typical)
Satellite COSPAR Date LS Launch Vehicle Remarks
JEM-EF (JEF) N/A 15.07.2009 CC LC-39A Shuttle with Endeavour F23 (STS-127), ANDE-2 AA, ANDE-2 PA, Bevo 1, AggieSat2