Moon
The outermost of Pluto's known moons, named after the many-headed serpent of Greek mythology.
| Type | Moon |
|---|---|
| Orbits | Pluto |
| Distance from parent body | 64,720 km |
| Diameter | 37 km |
| Mass | 3.00 × 10^16 kg |
| Surface gravity | 3.00e-3 m/s² |
| Temperature | -229°C |
| Orbital period | 38 days |
| Rotation period | 10.3 hours |
| Apparent magnitude | 23.1 |
| Redshift | 0 |
| Discovered | 2005 |
At 37 km across, Hydra is 1.1 percent of the diameter of Earth's Moon.
Its mass is less than a thousandth of the mass of Earth.
It orbits Pluto at 64,720 km, closer in than the Moon orbits Earth.
A single orbit takes 38.2 days.
An average temperature of 44 K works out at -229 degrees Celsius, colder than the 15 degrees Earth averages.
It has been on record since 2005.
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