Mimas
Mimas is an icy moon of Saturn, visually dominated by the large Herschel impact crater.
Also known as: Saturn I
How big is it?
396.4 km · mean diameter
Mean diameter · approximate
Typical recorded range: 395 km to 398 km.
A little perspective
Mimas vs Enceladus: diameter comparison
The mean diameter of Enceladus is about 1.27 times the mean diameter of mimas.
Mimas is an icy moon of Saturn, visually dominated by the large Herschel impact crater.
Enceladus is a natural satellite of Saturn, with an icy surface and plumes of water vapour erupting from its south pole.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
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.
Enceladus
Mean diameter: 504.2 km; approximate.
Rounded mean-radius model of Enceladus. The derived area and volume describe a sphere; surface terrain and flattening are omitted.
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.
Change your perspective
Put it next to…
Choose a suggestion to redraw the comparison, or open its page to learn what it is.
Why this measurement?
Why we use 396.4 km
We compare the mean diameter of mimas. This is an estimate; check the notes for its rounding and uncertainty. The recorded range is 395 km to 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.
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 |
|---|---|---|---|
| 396.4 km | 395 km to 398 km | approximate | |
| 3.75 × 10¹⁶ t | 3.7 × 10¹⁶ t to 3.8 × 10¹⁶ 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 valuePlaces 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.Around the same scaleVehicles and transportFive-hour drive at 100 km/h500 kmDistanceA five-hour drive at a set speed is the distance a vehicle covers in five hours of continuous travel without breaks.
Nearest higher valuePlanets, moons and spaceEnceladus504.2 kmMean diameterEnceladus is a natural satellite of Saturn, with an icy surface and plumes of water vapour erupting from its south pole.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.
SpaceSaturn116,500 kmSaturn is a giant planet made mostly of hydrogen and helium, distinguished by its extensive ring system.
SpaceMoon3,475 kmThe Moon is Earth’s natural satellite and the brightest large object in Earth’s night sky.
SpaceDeimos12.4 kmDeimos is the smaller and outermost natural satellite of Mars, with an irregular, rocky shape.SpaceEnceladus504.2 kmEnceladus is a natural satellite of Saturn, with an icy surface and plumes of water vapour erupting from its south pole.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.
SpaceCharon1,212 kmCharon is a natural satellite of Pluto, composed mainly of rock and water ice.
Places10,000 km² region10,000 km²A region is a large expanse of land defined by geographical or administrative boundaries.
SpaceCeres939.4 kmCeres is a dwarf planet located in the asteroid belt between Mars and Jupiter.