|Name (pre-launch in parentheses)||TANSEI-3 (MS-T3)|
|International Designation code||1977-012A|
|Objectives||Performance test of M-3H rocket, and demonstration of new technologies, such as magnetic-field-aligned, attitude-stabilization method and spin-axis control by cold gas jet, required for the next and subsequent scientific satellites.|
|Launch Date||14:15, February 19, 1977 (JST)|
|Launch Location||Kagoshima Space Center (Uchinoura)|
|Shape||Near circular cylinder, 931.2mm long from face to face and 800mm high|
|Orbital Altitude||Perigee 790 km, Apogee 3,810 km|
|Type of orbit||Elliptical|
|Orbital Period||134 min|
|Scientific Instruments||1.Infrared horizontal line detector
2.Digital sun sensor
3.Geomagnetic attitude meter
4.Cold gas jet instrument
|End of Operation||March 8, 1977|
|Operation||The plan was to conduct a cold-gas jet experiment in the first week and a magnetic field-aligned stabilization experiment in the second week. A shut-off valve malfunction, however, caused the cancellation of the gas-jet experiment, and instead, the magnetic field-aligned attitude stabilization experiment was conducted.
Due to operations performed from the 32nd though 39th revolutions, the maximum angle of the satellite-reference axis to the geomagnetic field line went from 6° to 18° during the 41st revolution. Thus, the magnetic field-aligned attitude stabilization system was demonstrated to function properly.