Moon
The second largest of the small inner moons of Uranus, part of a tightly packed group whose orbits may be unstable over long timescales.
| Type | Moon |
|---|---|
| Orbits | Uranus |
| Distance from parent body | 66,097 km |
| Diameter | 135 km |
| Mass | 1.17 × 10^18 kg |
| Surface gravity | 0.017 m/s² |
| Temperature | -209°C |
| Orbital period | 1 days |
| Apparent magnitude | 21.1 |
| Redshift | 0 |
At 135 km across, Portia is 3.9 percent of the diameter of Earth's Moon.
Its mass is less than a thousandth of the mass of Earth.
It orbits Uranus at 66,097 km, closer in than the Moon orbits Earth.
A single orbit takes 12.3 hours.
An average temperature of 64 K works out at -209 degrees Celsius, colder than the 15 degrees Earth averages.
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