(This activity was developed during the 1994 AASTRA training workshop in Flagstaff, Arizona) Io Fact Sheet Parent Planet: Jupiter Size (Diameter): 3,630 km (How big it is) Mass: 8.94 X 10 22 kg (How much it weighs) Orbital Distance: 421,600 km (How far it is from Jupiter) Orbital Period: 42 hours (How long it takes to make one orbit) Rotational Period: 42 hours (How long it takes to rotate once on its axis) Orbital Velocity: 17.33 km/s (How fast it travels) Atmosphere: None In the year 1610, Galileo 
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Io Fact Sheet