Back أوسومي (قمر اصطناعي) Arabic Осуми (спътник) Bulgarian Osumi (satelit) BS Ōsumi German Osumi (satélite) Spanish Osumi Basque اوسومی (ماهواره) Persian Ōsumi Finnish Ōsumi (satellite) French Ohsumi Galician
&sq=Sri Lanka&lang=en&file=File:Ohsumi.jpg) Artist's rendition of Ohsumi in orbit. | |
| Mission type | Earth science |
|---|---|
| Operator | Institute of Space and Aeronautical Science, University of Tokyo (now part of JAXA) |
| COSPAR ID | 1970-011A |
| SATCAT no. | 04330 |
| Mission duration | 33 years, 5 months and 21 days |
| Spacecraft properties | |
| Launch mass | 24.0 kilograms (52.9 lb)[1] |
| Power | 10.3 watt[1] |
| Start of mission | |
| Launch date | February 11, 1970, 04:25 UTC |
| Rocket | Lambda-4S |
| Launch site | Kagoshima LA-L |
| Contractor | ISAS |
| End of mission | |
| Last contact | February 12, 1970[2] |
| Decay date | August 2, 2003[3] |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Medium Earth |
| Eccentricity | 0.262379[4] |
| Perigee altitude | 350 kilometres (220 mi) |
| Apogee altitude | 5,140 kilometres (3,190 mi) |
| Inclination | 31.0 degrees[5] |
| Period | 144.0 minutes |
| Epoch | 10 February 1970, 23:25:00 UTC[4] |
The Ohsumi ( or Ōsumi, おおすみ) satellite, Japan’s first artificial satellite, was launched on February 11, 1970, at 04:25 UTC (Coordinated Universal Time) by the Institute of Space and Aeronautical Science (ISAS) from the Kagoshima Space Center, which is located on the Ohsumi peninsula in Japan.[6] This location was chosen for its strategic position in coordinating eastward launches, optimizing the rocket's trajectory.[6] The launch vehicle was the Lambda 4S-5, a rocket developed by the ISAS of the University of Tokyo.[7] Such an achievement marks Japan as the fourth nation to independently place a satellite into orbit.[8]
The satellite achieved an elliptical orbit with an apogee of approximately 5,150 km and a perigee of 335 km, conducting experiments to gather data on the ionosphere and testing satellite launch technologies.[9] Although its operational life ended within hours due to power loss, Ohsumi remained in orbit for over 33 years before re-entering the atmosphere on August 2, 2003.[9][10] The mission's success laid the foundation for Japan’s later achievements in space exploration, including scientific missions such as Hakucho and Hayabusa.[9]
- ^ a b "Ohsumi". NASA NSSDC Master Catalog. NSSDC, NASA. Retrieved 2008-02-12.
- ^ "ohsumi". Archived from the original on 11 May 2013. Retrieved 14 August 2015.
- ^ "SPX-598". SPACEWARN Bulletin. NSSDC, NASA. Archived from the original on 2008-01-05. Retrieved 2008-03-02.
- ^ a b "Trajectory Details". NASA NSSDC Master Catalog. NSSDC, NASA. Retrieved 2008-02-12.
- ^ "Osumi". Encyclopedia Astronautica. Astronautix. Archived from the original on November 17, 2002. Retrieved 2008-03-02.
- ^ a b "The University of Tokyo". The University of Tokyo. Retrieved 2024-11-05.
- ^ "OHSUMI | Spacecraft". ISAS. Retrieved 2024-11-05.
- ^ "Japan launches its first satellite | February 11, 1970". HISTORY. Retrieved 2024-11-05.
- ^ a b c "JAXA | The Beginning of Japan's Space Exploration". JAXA | Japan Aerospace Exploration Agency. Retrieved 2024-11-16.
- ^ "NASA Space Science Data Coordinated Archive". 28 October 2022.