Moon
The most volcanically active body in the solar system, driven by tidal heating from Jupiter.
| Type | Moon |
|---|---|
| Orbits | Jupiter |
| Distance from parent body | 421,700 km |
| Diameter | 3,643 km |
| Mass | 8.93 × 10^22 kg |
| Surface gravity | 1.79 m/s² |
| Temperature | -163°C |
| Orbital period | 2 days |
| Apparent magnitude | 5 |
| Redshift | 0 |
| Discovered | 1610 |
At 3,643 km across, Io is close to the diameter of Earth's Moon.
Its mass is 1.5 percent of the mass of Earth.
It orbits Jupiter at 421,700 km, further out than the Moon orbits Earth.
A single orbit takes 1.8 days.
An average temperature of 110 K works out at -163 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 1610.
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