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SFU was a Japanese space laboratory launched by the same H-2 rocket that launched GMS 5. It carried an infrared telescope (IRTS), and instruments and supplies for microgravity experiments. SFU was retrieved by the Space Shuttle STS 72 on January 13, 1996.

Alternate Names

  • Space Flyer Unit
  • 23521
  • IRTS

Facts in Brief

Launch Date: 1995-03-18
Launch Vehicle: H-2
Launch Site: Tanegashima, Japan
Mass: 4000 kg
Nominal Power: 27000 W

Funding Agency

  • Institute of Space and Aeronautical Science, U of Tokyo (Japan)


  • Astronomy
  • Microgravity

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office


Other Sources of IRTS Information/Data

IRTS Home Page at ISAS

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