||This article contains orbital elements but does not include an epoch, or date when those elements, which typically vary over time, were correct.|
|Mission type||Earth science|
|Operator||Institute of Space and Aeronautical Science, University of Tokyo (now part of JAXA)|
|Launch mass||24.0 kilograms (52.9 lb)|
|Start of mission|
|Launch date||February 11, 1970, 04:25UTC|
|Launch site||Kagoshima L|
|End of mission|
|Decay date||August 2, 2003|
|Perigee||350 kilometres (220 mi)|
|Apogee||5,140 kilometres (3,190 mi)|
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 in orbit for 33 years. Ōsumi decayed from orbit and burned up in the atmosphere on August 2, 2003.
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