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Mission Profile
| Name (pre-launch in parentheses) | TANSEI (MS-T1) | |
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| International Designation Code | 1971-11A | |
| Objectives | Performance verification of M-4S rocket and, after insertion into orbit, research on space environment and satellite performance test. | |
| Launch | Date | 13:00, February 16, 1971 (JST) |
| Location | Kagoshima Space Center (Uchinoura) | |
| Launch Vehicle | ||
| Configuration | Weight | 63 kg |
| Shape | 26-hedron in a sphere with a 75cm diameter [Click image for enlargement] |
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| Orbit | Altitude | Perigee 990 km, Apogee 1,100 km |
| Inclination | 30° | |
| Type of Orbit | Near-circular | |
| Period | 106 min | |
| Scientific Instruments | Telemetry transmitter Command receiver and decoder Magnetic tape-type data recorder, etc. Installed 6-reflection mirror on the satellite surface Carrying silver oxide–zinc battery as power supply |
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| End of Operation | February 23, 1971 | |
| Operation | The signal of the first rotation after launch was received from 14:50:40 to 15:09:12, confirming that the satellite had entered into orbit. Thereafter, observation at Uchinoura continued until 15:00 on February 23 (96 rotations). During the period, all the onboard instruments, except for an instrument to check solar-battery performance, functioned normally. By replaying the data recorder 37 times, abundant data were retrieved including temperature of various parts of the satellite, power-supply voltage and current, satellite altitude and spin status, etc. Tests for telemetry and command systems were performed without problems. After analysis, it was confirmed that temperature and environment inside the satellite were properly maintained as expected and the attitude of the satellite was stable. | |