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Hydraball is the largest (should you consider Charon-icon Charonball a binary dwarf planet) and outermost known moon of Pluto-icon Plutoball. It was dicovered in 2005 together with Nix-icon Nixball. It is named after the nine-headed monster from the greek mythology, as a reference to Pluto-icon Pluto being (in the past) the ninth planet.

Composition

While not much is known about Hydraball's composition, information from the New Horizons indicate that his surface is coated in water ice. It is hypothesized that Hydraball, along with the other Plutonian moons plus Charon-icon Charonball, formed from the debris that came when another dwarf planet collided with Pluto-icon Plutoball. This would mean that he should be similar in composition to Pluto-icon Plutoball's crust.

Orbit - Rotation

Hydraball orbits the barycenter between Pluto-icon Plutoball and Charon-icon Charonball in a circumbinary fashion. Like the other Plutonian moons, tidal evolution has reduced his eccentricity to nearly 0. Even then, his eccentricity is still somewhat significant, and his orbit is the most eccentric within the Pluto-Charon system. He also rotates chaotically, one of the few moons known to do so.


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