Tethys
Tethys is a mid-sized icy moon of Saturn, notable for its large impact basin and surface fractures.
Also known as: Saturn III, Tethys moon
How big is it?
1,062 km · mean diameter
Mean diameter · approximate
Typical recorded range: 1,060 km to 1,065 km.
A little perspective
Tethys vs Charon: diameter comparison
The mean diameter of Charon is about 1.14 times the mean diameter of Tethys.
Tethys is a mid-sized icy moon of Saturn, notable for its large impact basin and surface 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 +
Tethys
Mean diameter: 1,062 km; approximate; range 1,060 km–1,065 km.
Saturn moon Tethys has a mean diameter of about 1,062.2 km and mass of about 6.1745 × 10²⁰ kg. The identity-specific illustration includes the Odysseus basin and restrained Ithaca Chasma detail.
NASA JPL — Planetary satellite physical parameters
The marked mean 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 1,062 km
We compare the mean diameter of Tethys. This is an estimate; check the notes for its rounding and uncertainty. The recorded range is 1,060 km to 1,065 km.
Saturn moon Tethys has a mean diameter of about 1,062.2 km and mass of about 6.1745 × 10²⁰ kg. The identity-specific illustration includes the Odysseus basin and restrained Ithaca Chasma detail.
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 |
|---|---|---|---|
| 1,062 km | 1,060 km to 1,065 km | approximate | |
| 6.174 × 10¹⁷ t | 6.16 × 10¹⁷ t to 6.19 × 10¹⁷ 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 spaceCeres939.4 kmDiameterCeres is a dwarf planet located in the asteroid belt between Mars and Jupiter.
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 spaceDione1,123 kmMean-equivalent diameterDione is an icy moon of Saturn, distinguished by its heavily cratered surface and bright ice cliffs.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
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