Rhea
Rhea is an icy moon of Saturn with a heavily cratered surface and bright fractures.
Also known as: Saturn V moon, Rhea moon
How big is it?
1,528 km · mean-equivalent diameter
Mean-equivalent diameter · approximate
Typical recorded range: 1,525 km to 1,531 km.
A little perspective
Rhea vs Charon: diameter comparison
The mean-equivalent diameter of Rhea is about 1.26 times the mean diameter of Charon.
Rhea is an icy moon of Saturn with a heavily cratered surface and bright fractures.
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 +
Rhea
Mean-equivalent diameter: 1,528 km; approximate; range 1,525 km–1,531 km.
Saturn moon Rhea has a mean-equivalent diameter of about 1,528 km and a mass near 2.3065 x 10^21 kg. The identity-specific illustration includes its densely cratered surface and restrained bright fractures.
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 1,528 km
We compare the mean-equivalent diameter of Rhea. This is an estimate; check the notes for its rounding and uncertainty. The recorded range is 1,525 km to 1,531 km.
Saturn moon Rhea has a mean-equivalent diameter of about 1,528 km and a mass near 2.3065 x 10^21 kg. The identity-specific illustration includes its densely cratered surface and restrained bright fractures.
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 |
|---|---|---|---|
| 1,528 km | 1,525 km to 1,531 km | approximate | |
| 2.307 × 10¹⁸ t | 2.3 × 10¹⁸ t to 2.32 × 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 spaceDione1,123 kmMean-equivalent diameterDione is an icy moon of Saturn, distinguished by its heavily cratered surface and bright ice cliffs.
Around the same scalePlanets, moons and spaceTethys1,062 kmMean diameterTethys is a mid-sized icy moon of Saturn, notable for its large impact basin and surface fractures.
Nearest higher valuePlanets, moons and spaceEris2,326 kmDiameterEris is a dwarf planet in the scattered disc region beyond Neptune, composed of rock and ice.Sources and method
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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.
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Follow your curiosity.
SpaceDione1,123 kmDione is an icy moon of Saturn, distinguished by its heavily cratered surface and bright ice cliffs.SpaceTethys1,062 kmTethys is a mid-sized icy moon of Saturn, notable for its large impact basin and surface 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.
SpacePluto2,377 kmPluto is a dwarf planet in the Kuiper Belt, composed of rock and ice and orbiting the Sun.
SpaceTriton2,705 kmTriton is a natural satellite of Neptune, with a retrograde orbit and a surface of frozen nitrogen.
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.SpaceEris2,326 kmEris is a dwarf planet in the scattered disc region beyond Neptune, composed of rock and ice.