TOP > Our Enterprises > Missions > Test Satellite TANSEI-4 (MS-T4)
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Mission Profile
| Name (pre-launch in parentheses) | TANSEI-4 (MS-T4) | |
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| International Designation Code | 1980-015A | |
| Objectives | Performance test of M-3S rocket, and experiments of future satellite-control systems including automatic control of spin-axis solar-offset orientation by magnetic force and attitude control by fly wheels. | |
| Launch | Date | 09:40, February 17, 1980 (JST) |
| Location | Kagoshima Space Center (Uchinoura) | |
| Launch Vehicle | ||
| Configuration | Weight | 185 kg |
| Shape | Eight square pillar, 928mm diameter, 850mm high Four solar-array paddles  [Click image for enlargement] |
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| Orbit | Altitude | Perigee 521 km, Apogee 606 km |
| Inclination | 39° | |
| Type of Orbit | Near-circular | |
| Period | 96 min | |
| Scientific Instruments |
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| End of Operation | May 13, 1983 | |
| Reentered Date | May 13, 1983 | |
| Operation | In its first orbit around the earth, the yo-yo despinner was activated to reduce spin from 2.1 rps to 18 rpm and the solar-array paddles were deployed. A variety of engineering experiments were then conducted including: magnetic attitude control; wheel attitude control; tracking by laser reflector; tracking by radar transponder; spin-up by MPD arc jet; and recording and replay of magnetic valve data recorder. TANSEI-4 also observed solar flares with the solar Bragg X-ray spectrometer. In addition, we obtained good results on experiments using star mapper and S-band telemetry, performance evaluation of a new type of solar battery, performance evaluation of material for thermal control, and testing the AH integrator to manage the power system. | |