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 across
Mean-equivalent diameter · approximate
Typical recorded range: 260 km to 280 km.
A little perspective
Mimas is about 1.47 times larger on this measurement.
Mimas: Mimas is an icy moon of Saturn, visually dominated by the large Herschel impact crater.
Measurements, assumptions & sources +
Hyperion
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
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.
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Why this measurement?
Why we use 270 km
For comparison, this page uses mean-equivalent diameter. This is labelled approximate; the central value is useful for comparison, while real values or measurement solutions can vary. 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 named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
Hyperion 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
Go smaller. Go bigger.
These links use compatible length records, ordered around the selected value.
Nearest lower value · SpaceHimalia170 kmHimalia is an irregularly shaped outer moon of Jupiter, orbiting the planet at a great distance.
Around the same scale · PlacesRiver Thames346 kmThe River Thames is a major river in southern England that flows through London and empties into the North Sea.
Nearest higher value · SpaceMimas396.4 kmMimas 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.
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SpaceEnceladus504.2 kmEnceladus is a natural satellite of Saturn, with an icy surface and plumes of water vapour erupting from its south pole.
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