File:Hydra_reprocessed.png · Wikimedia Commons · See Wikimedia Commons
Hydra
Sign in to saveAlso known as (134340) Pluto III, Pluto III, S/2005 P 1
outermost known natural satellite of Pluto
Hydra is the outermost known natural satellite, or moon, of Pluto, the distant dwarf planet in our solar system. It matters because studying it helps us understand the system of moons around Pluto and the composition of objects in the outer reaches of our solar system.
AI-generated from the Wikipedia summary — may contain errors.
Wikidata facts
- Instance of
- moon of Pluto
- Named after
- Hydra
- Parent body
- Pluto
- Radius
- 57.5
- Mass
- 50000000000000000
- Orbital period
- 38.206
- Image
- Hydra 14.07.2015.jpg
Show 13 more facts
- discoverer or inventor
- Alan Stern
- provisional designation
- S/2005 P 1
- site of astronomical discovery
- Hubble Space Telescope
- time of discovery or invention
- 2005-05-15
- Commons category
- Hydra (moon)
- orbital eccentricity
- 0.0051
- semi-major axis of an orbit
- 64749
- orbital inclination
- 0.242
- temperature
- 55
- albedo
- 0.35
- apparent magnitude
- 23.38
- different from
- Hydra
- IPA transcription
- ˈhyːdʁa
via Wikidata · CC0
~9 min read
Encyclopedic overview
Hydra, formal designation (134340) Pluto III, is a natural satellite of Pluto, with a diameter of approximately 51 km (32 mi) across its longest dimension. It is the second-largest moon of Pluto, being slightly larger than Nix. Hydra was discovered along with Nix by astronomers using the Hubble Space Telescope on 15 May 2005, and was named after the Hydra, the nine-headed underworld serpent in Greek mythology. By distance, Hydra is the fifth and outermost moon of Pluto, orbiting beyond Pluto's fourth moon Kerberos.
Hydra has a highly reflective surface caused by the presence of water ice, similar to other Plutonian moons. Hydra's reflectivity is intermediate, in between those of Pluto and Charon. The New Horizons spacecraft imaged Pluto and its moons in July 2015 and returned multiple images of Hydra.
Excerpted from Wikipedia’s “Hydra” article, available under the CC BY-SA 4.0 licence.
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