How far out is Isonoe? A sense of scale

Comparing Isonoe’s orbit with Jupiter’s big moon Callisto.

Published 2026-10-23

Jupiter’s outer moons are a long way out. Isonoe’s mean distance is about 23.0 million km.^[3]

Compared with Callisto

Callisto, the outermost of Jupiter’s four big moons, orbits at about 1.88 million km.^[3] Isonoe is roughly twelve times farther out.

A slow lap

Isonoe takes about 712 days — almost two Earth years — to orbit Jupiter once.^[3]

A stretched orbit

With an eccentricity of about 0.25, its distance varies from about 17.3 to 28.7 million km.^[3]

Backwards and tilted

Its inclination of about 165° means it moves almost exactly backwards relative to Jupiter’s big moons.^[3][1]

Numbered citations link to the sources list on the Isonoe overview page.