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Here are details about a : Space commemorative cover or Space Cover.
Cosmodromo / Luogo : USA
Data di annullo: 17 Fév. 1959 Tipo di Evento : Lancio Rampa di Lancio / Luogo : USA KSC (FL) Missione con Equipaggio / Robotica : Robotica Obiettivo/Tipo Missione : Meteorologia
METEO
ou?/where?: au sol - ground
autographe?: non - none
Descrizione : Vanguard 2 was an earth-orbiting satellite designed to measure cloud-cover distribution over the daylight portion of its orbit. The spacecraft was a magnesium sphere 50.8 cm in diameter. It contained two optical telescopes with two photocells.
The satellite was spin stabilized at 50 rpm, but telemetry data were poor because of an unsatisfactory orientation of the spin axis. The power supply for the instrumentation was provided by mercury batteries.
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