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Vanguard 3
Vanguard 3 (international designation 1959 Eta 1〔
〕) is a scientific satellite that was launched into Earth orbit by a Vanguard rocket on September 18, 1959, the third successful Vanguard launch out of eleven attempts.
==Mission Objectives==
The satellite was launched from the Eastern Test Range into a geocentric orbit. The objectives of the flight were to measure the Earth's magnetic field, the solar X-ray radiation and its effects on the Earth's atmosphere, and the near-Earth micrometeoroid environment. Instrumentation included a proton magnetometer, X-ray ionization chambers, and various micrometeoroid detectors. The spacecraft was a 50.8-cm-diameter magnesium sphere. The magnetometer was housed in a glass fiber phenolic resin conical tube attached to the sphere. Data transmission stopped on December 11, 1959, after 84 days of operation. The data obtained provided a comprehensive survey of the Earth's magnetic field over the area covered, defined the lower edge of the Van Allen radiation belt, and provided a count of micrometeoroid impacts. Vanguard 3 has an expected orbital lifetime of 300 years.
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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