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Io
Orbital characteristics
Orbital period 2.8601 Earth days
1 Ioan day
Semi-major axis 1,264,883 km
Physical characteristics
Rotation period 2.8601 Earth days (synchr.)
Mean diameter 13,982 km
Axial tilt 0.6°
Temperature
Min.
Main
Max.

? K
584 K
? K
Atmospheric pressure (at MSL) 1593 mbar
Atmospheric Composition 76%N, 13%O, 10%SO2
Equatorial Surface Gravity 0.994 g
Other
Inhabitants
Density
0
0
Countries none recognized (according to UN)

Io is the nearest major planet of Jupiter. It is the most volcanically active body in the solar system.

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