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 Institute of Space and Aeronautical Science, University of Tokyo, 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 on its own.
The Ōsumi satellite weighed 24.0 kilograms. It orbited the Earth with a perigee of 323 km and an apogee of 2,440 km, and with an inclination of 31.0°. Ōsumi was on the orbit for 33 years. Ōsumi decayed from orbit and burned up in the atmosphere on August 2, 2003.
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