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Moon of Jupiter

Io

Mean radius1,821.5 km
Orbit (semi-major axis)421,800 km
Orbital period1.763 days

Voyager 1 spotted the first signs of Io's powerful volcanism in 1979.

Radius and orbit from JPL Solar System Dynamics satellite tables.

Sources

  1. NASA Science, Io
  2. JPL Solar System Dynamics, Planetary Satellite Physical Parameters
  3. JPL Solar System Dynamics, Planetary Satellite Mean Elements
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