Janus (moon of Saturn)

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

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

Planet: Saturn
Satellite: Janus
Satellite code: 610
GM: 0.12662 ± 0.00007 km³/s² (ephemeris SAT415)
Mean Radius: 89.2 ± 0.8 km (reference 1)
Mean Density: 0.6381 ± 0.0172 g/cm³ (NASA note: Mean Density is derived from the specified GM and Mean Radius.)
Ephemeris: SAT415
Reference frame: Laplace
Epoch (TDB): 2000-01-01.5
Semi-major axis a: 151500. km
Eccentricity e: 0.007
Argument of periapsis ω: 11.1 deg
Mean anomaly M: 111.7 deg
Inclination i: 0.2 deg
Longitude of ascending node: 159.9 deg
Sidereal period P: 0.697353 days
Argument of periapsis precession period: 0.240 yr
Longitude of ascending node precession period: 0.482 yr
Laplace-plane pole right ascension: 40.6 deg
Laplace-plane pole declination: 83.5 deg
Laplace-plane tilt: 0.0 deg
Mean elements reference: 17

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