Moon
A small, reddish inner moon of Jupiter, likely stained by sulfur particles from Io's volcanic eruptions.
| Type | Moon |
|---|---|
| Orbits | Jupiter |
| Distance from parent body | 181,400 km |
| Diameter | 167 km |
| Mass | 2.47 × 10^18 kg |
| Surface gravity | 0.0236 m/s² |
| Temperature | -150°C |
| Orbital period | 0 days |
| Apparent magnitude | 14.1 |
| Redshift | 0 |
| Discovered | 1892 |
At 167 km across, Amalthea is 4.8 percent of the diameter of Earth's Moon.
Its mass is less than a thousandth of the mass of Earth.
It orbits Jupiter at 181,400 km, closer in than the Moon orbits Earth.
A single orbit takes 12.0 hours.
An average temperature of 123 K works out at -150 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 1892.
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