Proteus (moon of Neptune)

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

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

Planet: Neptune
Satellite: Proteus
Satellite code: 808
GM: 2.58342 ± 2.42070 km³/s² (ephemeris NEP097)
Mean Radius: 208.00 ± 8.00 km (reference 1)
Mean Density: 1.0269 ± 0.9695 g/cm³ (NASA note: Mean Density is derived from the specified GM and Mean Radius.)
Ephemeris: NEP097
Reference frame: Laplace
Epoch (TDB): 2000-01-01.5
Semi-major axis a: 117600. km
Eccentricity e: 0.000
Argument of periapsis ω: 0.0 deg
Mean anomaly M: 276.8 deg
Inclination i: 0.0 deg
Longitude of ascending node: 0.0 deg
Sidereal period P: 1.122315 days
Argument of periapsis precession period: 0.000 yr
Longitude of ascending node precession period: 0.000 yr
Laplace-plane pole right ascension: 299.8 deg
Laplace-plane pole declination: 42.6 deg
Laplace-plane tilt: 0.9 deg
Mean elements reference: 24

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