Japanese Experiment Module - Exposed Facility (JEM-EF) is an external platform that can hold up to 10 experiment payloads at a time outside Kibo. The first JAXA instruments are SEDA-AP (Space Environment Data Acquisition Equipment-Attached Payload) and MAXI (Monitor of All-sky X-ray Image). The first NASA instruments will be a hyperspectral imager and an ionosphere detector.Facility Manager(s)
Japan Aerospace Exploration Agency (JAXA), Tsukuba, , Japan
Japan Aerospace Exploration Agency (JAXA)Expeditions Assigned
19/20Previous ISS Missions
The JEM-EF will be transported to the ISS with the JEM on STS-122(2J/A) in March 2009.
The Japanese Experiment Module - Exposed Facility (JEM-EF) is a unique platform on the ISS that is located outside of the Japanese Experiment module (JEM), Kibo (Hope) and is continuously exposed to the space environment. Astronauts exchange payloads/payload facilities from the Kibo through the scientific airlock using the Kibo Remote Manipulator System. Payloads/payload facilities positioned on the exterior platform focus on Earth observation, as well as, communication, scientific, engineering and materials science experiments.
The JEM-EF can hold up to 9 experiment payloads at a time; it measures 5.6 m x 5 m x 4 m with a mass of approximately 4000 kg. JEM-EF will be operated for approximately ten years on orbit supporting exposed experiments. It will supply electrical power, circulate coolant and collect payload/payload facilities data. Standard payload/payload facility size for the JEM-EF is 1.85 m x 1.0 m x 0.8 m with a mass of 500 kg including all payload accommodations.
JEM-EF provides utilities, including two channels of 120Vdc power supply for payload normal operation; the wire size for each channel can provide up to 3KW. The survival power supply to each payload is 100W and is provided separately. Payload commands can be processed via standard MIL-STD-1553B data line to each location. Two Ethernet connections are available at payload locations #1, #5, #2 and #6. High rate fiber-optical downlink and active cooling is provided to each payload location. Additional analog lines are available at each payload location to process payload housekeeping data for temperature and pressure. A data line which meets NTSC (image/synchronization control) specification is available at each payload location to process payload video system data.
The JEM-EF consists of several components:
The JEM-EF will be transported to the ISS with the JEM on STS-122(2J/A) in March 2009. JEM-EF payloads and payload facilities will be transported to and from orbit using an ISS program-supplied carrier. Once the carrier is docked, the payload/payload facility will be maneuvered by the robotic manipulators of the ISS to its final operational location on the JEM-EF. At the end of its operational phase, a payload will be transported to the carrier by robotic means and then returned to ground for post-mission inspection and analysis and, possibly, refurbishment.