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SFU (Space Flyer Unit) was a Japanese space laboratory launched by the same H-2 + SSB rocket that launched GMS 5. It carried an infrared telescope (IRTS), and instruments and supplies for microgravity experiments.

IRTS was Japan's first orbiting telescope dedicated to infrared observations (1 - 1000 micron range) of the interstellar medium, late type stars and interplanetary dust. IRTS instrumentation was attached to a multi-purpose Space Flyer Unit (SFU). The four primary science instruments were the Near Infrared Spectrometer (NIRS), the Mid Infrared Spectrometer (MIRS), the Far-Infrared Line Mapper (FILM), and the Far-Infrared Photometer (FIRP). All instruments were located at the focal plane of a 15-cm aperture telescope. Approximately 7 percent of the sky was surveyed during a four-week period.

SFU was retrieved by the Shuttle STS 72 on January 13, 1996.

Nation: Japan
Type / Application: Microgravity, Astronomy (Infra red), Shuttle retrievable carrier
Operator: NASDA
Contractors: Mitsubishi Electric (MELCO)
Equipment: IRTS
Power: 2 deployable fixed solar arrays, batteries
Mass: 4000 kg
Orbit: 344 km × 415 km, 28.4
Satellite COSPAR Date LS Launch Vehicle Remarks
SFU 1 1995-011A 18.03.1995 Ta YLP-1 H-2 + SSB with GMS 5