Dione
Dione is an icy moon of Saturn, distinguished by its heavily cratered surface and bright ice cliffs.
Also known as: Saturn IV, Dione moon
How big is it?
1,123 km · mean-equivalent diameter
Mean-equivalent diameter · approximate
Typical recorded range: 1,120 km to 1,125 km.
A little perspective
Dione vs Charon: diameter comparison
The mean diameter of Charon is about 1.08 times the mean-equivalent diameter of Dione.
Dione is an icy moon of Saturn, distinguished by its heavily cratered surface and bright ice cliffs.
Charon is a natural satellite of Pluto, composed mainly of rock and water ice.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
Dione
Mean-equivalent diameter: 1,123 km; approximate; range 1,120 km–1,125 km.
Saturn moon Dione has a mean-equivalent diameter of about 1,122.8 km and a mass near 1.0955 x 10^21 kg. The identity-specific illustration includes its cratered surface and bright fracture cliffs.
NASA JPL — Planetary satellite physical parameters
The marked mean-equivalent diameter is calibrated. Unmeasured illustration details are representative.
Charon
Mean diameter: 1,212 km; approximate.
Rounded mean-radius model of Charon. 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.
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Why this measurement?
Why we use 1,123 km
We compare the mean-equivalent diameter of Dione. This is an estimate; check the notes for its rounding and uncertainty. The recorded range is 1,120 km to 1,125 km.
Saturn moon Dione has a mean-equivalent diameter of about 1,122.8 km and a mass near 1.0955 x 10^21 kg. The identity-specific illustration includes its cratered surface and bright fracture cliffs.
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 |
|---|---|---|---|
| 1,123 km | 1,120 km to 1,125 km | approximate | |
| 1.096 × 10¹⁸ t | 1.09 × 10¹⁸ t to 1.1 × 10¹⁸ 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 spaceTethys1,062 kmMean diameterTethys is a mid-sized icy moon of Saturn, notable for its large impact basin and surface fractures.
Around the same scalePlanets, moons and spaceCharon1,212 kmMean diameterCharon is a natural satellite of Pluto, composed mainly of rock and water ice.
Nearest higher valuePlanets, moons and spaceRhea1,528 kmMean-equivalent diameterRhea is an icy moon of Saturn with a heavily cratered surface and bright fractures.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.
SpaceTethys1,062 kmTethys is a mid-sized icy moon of Saturn, notable for its large impact basin and surface fractures.SpaceRhea1,528 kmRhea is an icy moon of Saturn with a heavily cratered surface and bright fractures.
SpaceSaturn116,500 kmSaturn is a giant planet made mostly of hydrogen and helium, distinguished by its extensive ring system.SpaceCharon1,212 kmCharon is a natural satellite of Pluto, composed mainly of rock and water ice.
SpaceCeres939.4 kmCeres is a dwarf planet located in the asteroid belt between Mars and Jupiter.
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SpacePluto2,377 kmPluto is a dwarf planet in the Kuiper Belt, composed of rock and ice and orbiting the Sun.
SpaceEnceladus504.2 kmEnceladus is a natural satellite of Saturn, with an icy surface and plumes of water vapour erupting from its south pole.