Ohsumi

Launch data: Designation  04330 / 70011A Launch date  11 Feb 1970 - 04:25 UT Launch site  Kagoshima Space Center Launch vehicle  Lambda-4S (#L-4S-5) Mission  Earth science Elliptical Earth orbit: Perigee / Apogee  350 x 5140 km Inclination  31° Period  113.1 min

Spacecraft data: Prime contractor   Platform   Operator  Institute of Space and AEronautical Science Mass at launch  23.8 kg Dry Mass   kg Basic shape   Dimension  Overall lengthy: 1.0m, max dia: 0.48m (at 4th motor of rocket) Equipment  Equipped with two hook-type antennes and four beryllium-copper whip-type antennas (circular polarization) Stabilization   DC power  10.3 W

Scientific Instruments:

• Longitudinal precise accelerometer
• Longitudinal accelerometer
• Strain guage-type thermometer
• Telemetry transmitter
• Beacon transmitter
• Pilot transmitter
• Installed silver oxide-zinc battery with capacity 5AH as power supply

Decay:

Mission details:

• Objectives: To study satellite launch technologies by M (Mu) rocket and perform an engineering experiment on the satellite.
• Ohsumi is the name of the first Japanese artificial satellite put into orbit, named after the Ohsumi 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.
• From 15:56:10 to 16:06:54 (JST), about two and a half hours after the launch, a radio signal from OHSUMI was received at Uchinoura to confirm its first revolution around the earth. The radio signal level gradually fell and the next day, February 12, during its 6th revolution, it became very faint. The signal could no longer be detected during the 7th revolution. It is believed that the signal of OHSUMI was lost 14 to 15 hours after launch, probably caused by rapid reduction of power capacity because of higher than expected temperatures. The satellite continued to orbit the earth, and at 05:45 on August 2, 2003 (JST) it reentered the atmosphere and was melted. The reentry location was around Lat. 30°3' N, Long. 25°0' E, over North Africa (border between Egypt and Libya).