Io (moon of Jupiter)

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

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

Planet: Jupiter
Satellite: Io
Satellite code: 501
GM: 5959.91547 ± 0.00135 km³/s² (ephemeris JUP365)
Mean Radius: 1821.49 ± 0.50 km (reference 1)
Mean Density: 3.5276 ± 0.0029 g/cm³ (NASA note: Mean Density is derived from the specified GM and Mean Radius.)
Ephemeris: JUP365
Reference frame: Laplace
Epoch (TDB): 2000-01-01.5
Semi-major axis a: 421800. km
Eccentricity e: 0.004
Argument of periapsis ω: 49.1 deg
Mean anomaly M: 330.9 deg
Inclination i: 0.0 deg
Longitude of ascending node: 0.0 deg
Sidereal period P: 1.762732 days
Argument of periapsis precession period: 1.333 yr
Longitude of ascending node precession period: 0.000 yr
Laplace-plane pole right ascension: 268.1 deg
Laplace-plane pole declination: 64.5 deg
Laplace-plane tilt: 0.0 deg
Mean elements reference: 29

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