Skip to content
79,433 pages · 13,741 images · since 1994 Browse A–Z Today in space history
Encyclopedia Astronautica The full story of spaceflight
Encyclopedia entry

USERS

Spacecraft · Japan

Original archive entry. The text, images and links below are kept as they were written.

USERS
USERS
Credit: Manufacturer Image

Japanese materials science satellite. USERS (Unmanned Space Experiment Recovery System) was a Japanese microgravity experimental satellite. Micro gravity and return satellite built by Mitsubishi Electric (MELCO) for Institute for Unmanned Space Experiment Free Flyer (USEF), Japan. Launched 2002.

The 1.7-ton (with fuel), 700-W satellite consisted of a ReEntry Module (REM) and a Service Module (SEM) that was to provide power and a communications link to the REM. In turn, REM consisted of a ReEntry Vehicle (REV) and a Propulsion Module (PM). After 8.5 months in orbit, REM was to be separated to deorbit and the REV was to soft-land with its contents at 151E 22N in the Pacific near Japan's Ogasawara Islands. The SEM was to be elevated to a higher orbit.

The SEM had a mass of 800 kg; the REV/PM had a total mass of 926 kg

More at: USERS.

Country
Japan
Launch Vehicles
H-II, H-IIA, H-IIA 2024
Bibliography
2, 552, 554, 13320

Chronology

1 event

2002 September 10

08:20 GMT - . Launch Site: Tanegashima. Launch Complex: Tanegashima Y. LV Family: H-2. Launch Vehicle: H-IIA 2024.
  • USERS - . Mass: 1,726 kg (3,805 lb). Nation: Japan. Agency: NASDA. Manufacturer: Mitsubishi. Class: Materials. Type: Materials science satellite. Spacecraft: USERS. Decay Date: 2007-06-15 . USAF Sat Cat: 27515 . COSPAR: 2002-042A. Apogee: 508 km (315 mi). Perigee: 497 km (308 mi). Inclination: 30.40 deg. Period: 94.70 min.

    Launch delayed from August 2002. First operational flight of H-2A booster. USERS (Unmanned Space Experiment Recovery System) was a Japanese microgravity experimental satellite. After 8.5 months in orbit, a reentry vehicle was to be returned to earth with the materials manufacturered in space.