Iapetus (moon of Saturn)

Document v1 · published by Koskamo · updated 2026-10-04

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

Planet: Saturn
Satellite: Iapetus
Satellite code: 608
GM: 120.51511 ± 0.00242 km³/s² (ephemeris SAT441)
Mean Radius: 734.30 ± 2.80 km (reference 1)
Mean Density: 1.0887 ± 0.0125 g/cm³ (NASA note: Mean Density is derived from the specified GM and Mean Radius.)
Ephemeris: SAT441
Reference frame: Laplace
Epoch (TDB): 2000-01-01.5
Semi-major axis a: 3561700. km
Eccentricity e: 0.028
Argument of periapsis ω: 254.5 deg
Mean anomaly M: 74.8 deg
Inclination i: 7.6 deg
Longitude of ascending node: 86.5 deg
Sidereal period P: 79.331002 days
Argument of periapsis precession period: 1662.900 yr
Longitude of ascending node precession period: 3130.302 yr
Laplace-plane pole right ascension: 288.7 deg
Laplace-plane pole declination: 78.9 deg
Laplace-plane tilt: 14.8 deg
Mean elements reference: 36

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 Koskamo2026-10-04
Version 1