Moon
An irregularly shaped inner moon of Neptune, discovered during a stellar occultation before being confirmed by Voyager 2.
| Type | Moon |
|---|---|
| Orbits | Neptune |
| Distance from parent body | 73,548 km |
| Diameter | 194 km |
| Mass | 3.82 × 10^18 kg |
| Surface gravity | 0.019 m/s² |
| Temperature | -222°C |
| Orbital period | 1 days |
| Apparent magnitude | 22 |
| Redshift | 0 |
| Discovered | 1981 |
At 194 km across, Larissa is 5.6 percent of the diameter of Earth's Moon.
Its mass is less than a thousandth of the mass of Earth.
It orbits Neptune at 73,548 km, closer in than the Moon orbits Earth.
A single orbit takes 13.3 hours.
An average temperature of 51 K works out at -222 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 1981.
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