Pioneer - Pioneer The first spacecraft to pass by Io were...

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Pioneer The first spacecraft to pass by Io were the twin Pioneer 10 and 11 probes on December 3, 1973 and December 2, 1974 respectively. [26] Radio tracking provided an improved estimate of Io's mass, which, along with the best available information of Io's size, suggested that Io had the highest density of the four Galilean satellites, and was composed primarily of silicate rock rather than water ice. [27] The Pioneers also revealed the presence of a thin atmosphere at Io and intense radiation belts near the orbit of Io. The camera on board Pioneer 11 took the only good image of Io obtained by either spacecraft, showing its north polar region. [28] Close-up images were planned during Pioneer 10 's encounter with Io, but those observations were lost because of the high- radiation environment. [ Voyager Mosaic of Voyager 1 images covering Io's south polar region When the twin probes Voyager 1 and Voyager 2 passed by Io in 1979, their more advanced imaging system allowed for far more detailed images. Voyager 1
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This note was uploaded on 12/15/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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Pioneer - Pioneer The first spacecraft to pass by Io were...

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