Japanese Experiment Module - Exposed Facility (JEM-EF) - 08.20.14
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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.
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Japan Aerospace Exploration Agency (JAXA), Tsukuba, , Japan
Sponsoring Space Agency
Japan Aerospace Exploration Agency (JAXA)
ISS Expedition Duration
March 2009 - October 2009
Previous 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) will be utilized by Japan Aerospace and Exploration Agency (JAXA) for experiments. The facility may be available for use by all international partners involved in the International Space Station (ISS).
- The payload interface for the JEM-EF is the Exposed Facility Unit (EFU). There are 12 EFUs on the JEM-EF, 8 of which are available for users. The other three are used for temporary storages and JEM/JEM EF Inter-orbit Communication System (ICS).
- JEM-EF is expected to contribute to the evolution of science and technology and promote international cooperation.
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:
- Small Fine Arm (SFA) is the secondary arm which will be attached to the end of JEM - Remote Manipulator System (JEM-RMS), primary arm. The SFA is used for fine manipulation tasks and will be stowed on the JEM-EF when not in use. The JEM-RMS is used to exchange payload/payload facility units.
- JEM-EF Camera and Light consists of a TV camera, a light and a pan/tilt unit. This component gives a view of payloads/payload facilities when they are being exchanged by the JEM-RMS.
- Equipment Exchange Unit (EEU) is a mechanism on JEM EF which connects the Payload Interface Unit (PIU) on payload to the JEM-EF. All utilities are provided through this interface from JEM EF to payload.
- The JEM-EF will be transported to the ISS with the JEM.
- JEM-EF payloads and payload facilities will be transported to and from orbit using an ISS program-designated carrier.
- Placement and retrieval of payloads and payload facilities will be accomplished with the ISS robotic arms and the JEM-EF small fine arm.
Ground Based Results Publications
The JEM-EF flight unit under construction at the JAXA facility in Tsukuba, Japan. The JEM-EF provides payloads with electrical power, data, and active thermal control. Image courtesy of JAXA.
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Computer generated image of the completed International Space Station with external workstations. Image courtesy of NASA.
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