Tansei 4

Launch data:

Spacecraft data: Prime contractor   Platform   Operator   Mass at launch  185 kg Dry Mass   kg Basic shape  Octagonal cylinder Dimension (m)   Equipment   Solar array  four solar-array paddles Stabilization   Propulsion   DC power   Design lifetime

Decay:

Scientific Instruments:

• 1. Solar-array paddles
• 2. S band telemetry
• 3. Sun sensor
• 4. Geomagnetic sensor
• 5. Bragg spectrometer
• 6. Ampere integrator
• 7. Magnetic valve recorder

Mission details:

• 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.
• 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.