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| Organization | ISAS (now part of JAXA) |
|---|---|
| Mission type | Earth science |
| Satellite of | Earth |
| Launch date | February 11, 1970 at 04:25 UTC |
| Launch vehicle | Lambda 4S-5 |
| Orbital decay | August 2, 2003 |
| COSPAR ID | 1970-011A |
| Mass | 24.0 kg[1] |
| Power | 10.3 watt[1] |
| Orbital elements | |
| Eccentricity | .262379[2] |
| Inclination | 31.0°[2] |
| Orbital period | 144.0 minutes[2] |
| Apoapsis | 5,140 km[2] |
| Periapsis | 350 km[2] |
Ōsumi (or Ohsumi) is the name of the first Japanese artificial satellite put into orbit, named after the Ōsumi Province in the southern islands of Japan. It was launched on February 11, 1970 at 04:25 UTC with a Lambda 4S-5 rocket from Uchinoura Space Center by Japan's Institute of Space and Astronautical Science (ISAS), now part of the Japan Aerospace Exploration Agency (JAXA). Japan became the fourth nation after the USSR, USA and France to release an artificial satellite into successful orbit.
The Ōsumi satellite weighed 24 kilograms. It orbited the Earth with a perigee of 323 km and an apogee of 2440 km, and with an inclination of 31.0°.[3] Ōsumi decayed from orbit and burned up in the atmosphere on August 2, 2003.[4]
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