Hydra
outermost known natural satellite of Pluto
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Summary
Hydra is a moon of Pluto[1]. Hydra draws 1,286 Wikipedia views per month (moon of pluto category, ranking #4 of 5).[2]
Key Facts
- Discoverer or inventor: Alan Stern[3], Marc Buie[4]
- Site of astronomical discovery: Hubble Space Telescope[5]
- Named after: Hydra[6]
- Part of: Pluto System[7]
- Commons category: Hydra (moon)[8]
- Parent astronomical body: Pluto[9]
- Provisional designation: S/2005 P 1[10]
- Time of discovery or invention: May 15, 2005[11]
- IPA transcription: ˈhyːdʁa[12]
- Orbital eccentricity: 0.0051[13]
- Apparent magnitude: 23.38[14]
- Different from: Hydra[15]
- Orbital inclination: 0.242 degree[16]
- Mass: 50,000,000,000,000,000 kg[17]
- Temperature: 33 K[18], 55 K[19]
- Radius: 57.5 km[20]
- Orbital period: 38.206 day[21]
- Semi-major axis of an orbit: 64,749 km[22]
- Albedo: 0.35[23]
Why It Matters
Hydra has Wikipedia articles in 29 language editions, a strong signal of global cultural recognition.[24] Hydra is known by 45 alternative names across languages and contexts.[25]