Hyperion
Hyperion is a porous, irregularly shaped moon of Saturn that rotates chaotically and has a sponge-like surface.
Also known as: Saturn VII, Hyperion moon
How big is it?
270 km · mean-equivalent diameter
Mean-equivalent diameter · approximate
Typical recorded range: 260 km to 280 km.
A little perspective
Hyperion vs Mimas: diameter comparison
The mean diameter of mimas is about 1.47 times the mean-equivalent diameter of Hyperion.
Hyperion is a porous, irregularly shaped moon of Saturn that rotates chaotically and has a sponge-like surface.
Mimas is an icy moon of Saturn, visually dominated by the large Herschel impact crater.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
Hyperion
Mean-equivalent diameter: 270 km; approximate; range 260 km–280 km.
Saturn moon Hyperion has a mean radius near 135 km, represented by a 270 km mean-equivalent diameter, and a mass near 5.62 x 10^18 kg. Its actual 410 x 260 x 220 km body is irregular, porous and chaotically rotating.
NASA JPL — Planetary satellite physical parameters
The marked mean-equivalent diameter is calibrated. Unmeasured illustration details are representative.
Mimas
Mean diameter: 396.4 km; approximate; range 395 km–398 km.
Saturn’s moon Mimas is about 396 km across and dominated visually by Herschel crater. The diameter is a mean for an imperfect sphere.
NASA JPL — Planetary satellite physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
Use the visual comparison to explore its scale, then check the measurements and sources.
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Why this measurement?
Why we use 270 km
We compare the mean-equivalent diameter of Hyperion. This is an estimate; check the notes for its rounding and uncertainty. The recorded range is 260 km to 280 km.
Saturn moon Hyperion has a mean radius near 135 km, represented by a 270 km mean-equivalent diameter, and a mass near 5.62 x 10^18 kg. Its actual 410 x 260 x 220 km body is irregular, porous and chaotically rotating.
The marked horizontal span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 270 km | 260 km to 280 km | approximate | |
| 5.62 × 10¹⁵ t | 5.5 × 10¹⁵ t to 5.8 × 10¹⁵ t | approximate |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valuePlanets, moons and spaceHimalia170 kmMean-equivalent diameterHimalia is an irregularly shaped outer moon of Jupiter, orbiting the planet at a great distance.
Around the same scalePlaces and natural featuresRiver Thames346 kmApproximate main-channel lengthThe River Thames is a major river in southern England that flows through London and empties into the North Sea.
Nearest higher valuePlanets, moons and spaceMimas396.4 kmMean diameterMimas is an icy moon of Saturn, visually dominated by the large Herschel impact crater.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- NASA JPL — Planetary satellite physical parametersPublished mean radii and gravitational parameters GM. Spherical areas, volumes, masses and local gravity are explicitly derived.
There’s always another scale
Follow your curiosity.
SpaceRhea1,528 kmRhea is an icy moon of Saturn with a heavily cratered surface and bright fractures.
SpaceTitan5,150 kmTitan is a natural satellite of Saturn, with a thick nitrogen-rich atmosphere and surface lakes of hydrocarbons.
SpaceSaturn116,500 kmSaturn is a giant planet made mostly of hydrogen and helium, distinguished by its extensive ring system.SpaceMimas396.4 kmMimas is an icy moon of Saturn, visually dominated by the large Herschel impact crater.TransportFive-hour drive at 100 km/h500 kmA five-hour drive at a set speed is the distance a vehicle covers in five hours of continuous travel without breaks.
SpaceEnceladus504.2 kmEnceladus is a natural satellite of Saturn, with an icy surface and plumes of water vapour erupting from its south pole.
Places10,000 km² region10,000 km²A region is a large expanse of land defined by geographical or administrative boundaries.TransportOne-hour drive at 100 km/h100 kmA one-hour drive at a set speed is the distance a vehicle travels in one hour of uninterrupted motion.