Vanguard 3, a scientific satellite, was launched September 18, 1959 by the US Naval Research Laboratory from the Atlantic Missile Range at Cape Canaveral. Vanguard 3 operated for 84 days, until December 11, 1959 when the batteries expired.
It measured Earth's magnetic field, solar X-ray radiation, and the micrometeoroid environment. It remains in orbit and has an expected lifetime of 300 years.
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