Hydra (moon of Pluto)

Document v1 · published by Koskamo · updated 2026-10-05

Hydra is a natural satellite of Pluto in the NASA/JPL Solar System Dynamics planetary satellite tables.

Planet: Pluto
Satellite: Hydra
Satellite code: 903
GM: 0.0020 ± 0.0003 km³/s² (ephemeris PLU060)
Mean Radius: 18.5 ± 1.0 km (reference 3)
Mean Density: 1.21 ± 0.19 g/cm³ (NASA note: Mean Density is derived from the specified GM and Mean Radius.)
Ephemeris: PLU060
Reference frame: equatorial
Epoch (TDB): 2000-01-01.5
Semi-major axis a: 65200. km
Eccentricity e: 0.009
Argument of periapsis ω: 139.3 deg
Mean anomaly M: 335.0 deg
Inclination i: 0.3 deg
Longitude of ascending node: 114.3 deg
Sidereal period P: 38.20 days
Argument of periapsis precession period: -
Longitude of ascending node precession period: 14 yr
Mean elements reference: 6

Source and provenance

Original source: ssd.jpl.nasa.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: NASA/JPL Solar System Dynamics planetary satellite mean elements and physical parameters (ssd.jpl.nasa.gov/sats), a work of the US government (public domain in the United States)

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Version history

Published by Koskamo2026-10-05
Version 1