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Explorer 10
Explorer 10 (also known as Explorer X or P14) was an American Earth-orbital satellite that investigated Earth's magnetic fields and nearby plasma. Launched on March 25, 1961, it was an early mission in the Explorer program and was the first satellite to measure the "shock wave" generated by a solar flare.
==Mission==
The objective was to investigate the magnetic fields and plasma as the spacecraft passed through Earth's magnetosphere and into cislunar space. The satellite was launched into a highly-elliptical orbit and was spin-stabilized with a spin period of 0.548 s. The direction of its spin vector was 71 degrees right ascension and minus 15 degrees declination.
Because of the limited life of the spacecraft batteries, the only useful data were transmitted in real time for 52 hours on the ascending portion of the first orbit. The distance from the Earth when the last bit of useful information was transmitted was 42.3 Earth radii, and the local time at this point was 2200 h. All transmission ceased several hours later.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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