Hydra

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Pluto and its large moon, Charon, appear overexposed in this Hubble Space Telescope image obtained in 2006 to confirm the existence of the two small moons Nix and Hydra (at right).

Pluto; Charon; Nix; Hydra

How do features on Pluto and its moons get their names?

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Hydra

moon of Pluto

Also known as: P1, S/2005 P1

Learn about this topic in these articles:

characteristics

In Pluto: Pluto’s moons
Pluto’s other four moons—Hydra, Nix, Kerberos, and Styx—are much smaller than Charon. All four are elongated. They revolve around Pluto outside Charon’s path in nearly circular orbits (like Charon) and in the same orbital plane as Charon. The orbital radius of Hydra is about 64,721 km (40,216 miles);…
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discovery

In Hubble Space Telescope
…was also used to discover Hydra and Nix, two moons of the dwarf planet Pluto.
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New Horizons

In New Horizons
Nix, Kerberos, and Hydra—were found to be spinning very rapidly, unlike most other satellites in the solar system, which keep one side facing the planet they orbit.
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