Hydra

E132341

Hydra is one of Pluto’s small outer moons, discovered in 2005 and named after the many-headed serpent from Greek mythology.

All labels observed (1)

Label Occurrences
Hydra canonical 9

How this entity was disambiguated

Statements (48)

Predicate Object
instanceOf Plutonian moon
astronomical object
celestial body
natural satellite
albedo high
approximateDimensions_km 50×36×30
belongsToPlanetarySystem Solar System
color neutral to slightly bluish
density_g_per_cm3 about 1
discoveredBy Hubble Space Telescope
Pluto Companion Search Team
surface form: Hubble Space Telescope Pluto Companion Search Team
discoveredInYear 2005
discoveryDate 2005-06-15
eccentricity 0.0059
exploredBy New Horizons
surface form: New Horizons spacecraft
flybyMissionDate 2015-07-14
hasNo substantial atmosphere
hasOrbitalDirection prograde
hasOrbitalResonanceWith Kerberos (moon)
Nix (moon)
Styx (moon)
hasShape irregular
inclination_degrees 0.24
locatedIn Kuiper Belt
surface form: Kuiper belt
mass_kg on the order of 10^17
meanDiameter_km about 43
meanOrbitalDistanceFromPluto_km 64738
memberOf Pluto’s satellite system
surface form: Pluto system

Pluto’s small outer moons
namedAfter LernaeanHydra
surface form: Lernaean Hydra

many-headed serpent from Greek mythology
namingTheme underworld-related mythological figures
officialNameAdoptedBy International Astronomical Union
orbitalPeriod_days 38.20177
orbits Pluto
orbitsBarycenterWith Charon
outerMoonRelativeTo Charon
Kerberos (moon)
Nix (moon)
Styx (moon)
partOf Pluto’s satellite system
surface form: Pluto–Charon system
primaryBody Pluto
provisionalDesignation S/2005 P 1
rotationState chaotic rotation
semiMajorAxis_km 64738
surfaceComposition water ice-rich
surfaceFeature cratered terrain
systemEscapeVelocity_m_per_s about 30

How these facts were elicited

Referenced by (9)

Full triples — surface form annotated when it differs from this entity's canonical label.