Phoebe size and scale context

Phoebe is a dark irregular moon of Saturn with a distant, retrograde orbit. Cassini's 2004 flyby showed a battered icy-rocky body that may be a captured outer Solar System object, making Phoebe a clue to material beyond Saturn's regular moons. Read its scale context, comparisons, and journey links on the canonical object page.

PuckSmall inner moon·162 km

JanusCo-orbital inner moon·203 km

PhoebeCaptured irregular moon·219 km

NereidIrregular outer moon·357 km

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Moons

Janus

Janus is a cratered inner moon of Saturn that shares almost the same orbit as Epimetheus. Roughly every four years, the two moons exchange momentum and swap which one follows the inner path without ever colliding.

Scale fact203 kmmaximum extent

Object class: Co-orbital inner moon
Composition: Water ice and rock (rubble pile)
Temperature: 76 K surface
Mass: ~1.9 quadrillion tonnes
Host: Saturn

Moons

Phoebe

Scale fact219 kmmaximum extent

Object class: Captured irregular moon
Host: Saturn
Composition: Water ice, rock and dark carbon-rich material

Moons

Nereid

Nereid is a distant irregular moon of Neptune with one of the most eccentric moon orbits in the Solar System. Its 360-day path suggests either capture from elsewhere or a major disturbance during the capture of Triton.

Scale fact357 kmmean diameter

Object class: Irregular outer moon
Host: Neptune