Hyperion size and scale context

Hyperion is Saturn's largest irregular nonspherical moon, a porous, sponge-like body with chaotic rotation. Its lumpy shape and deeply punched-in craters suggest a small icy world shaped by impact history rather than by quiet roundness. Read its scale context, comparisons, and journey links on the canonical object page.

NereidIrregular outer moon·357 km

HyperionIrregular icy moon·360 km

MimasIcy moon·396 km

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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

Moons

Hyperion

Scale fact360 kmmaximum extent

Object class: Irregular icy moon
Host: Saturn
Composition: Water ice and rock

Moons

Mimas

Mimas is a small icy moon of Saturn dominated by the enormous Herschel crater. NASA notes that the impact that made Herschel may have come close to shattering the moon, leaving one of the most disproportionate giant craters in the Solar System.

Scale fact396 kmdiameter

Object class: Icy moon
Mass: ~38 quadrillion tonnes
Host: Saturn
Estimated age: ~4.5 billion years
Composition: Mostly water ice
Temperature: ~75 K surface