Triton
Triton is a natural satellite of Neptune, with a retrograde orbit and a surface of frozen nitrogen.
How big is it?
2,705 km across
Mean diameter · approximate
A little perspective
About the same scale as Pluto.
Pluto: Pluto is a dwarf planet in the Kuiper Belt, composed of rock and ice and orbiting the Sun.
Measurements, assumptions & sources +
Triton
Rounded mean-radius model of Triton. 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.
Pluto
Mean-radius spherical model for Pluto; actual shape is not perfectly spherical.
NASA JPL — planetary physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 2,705 km
For comparison, this page uses mean diameter. This is labelled approximate; the central value is useful for comparison, while real values or measurement solutions can vary.
Rounded mean-radius model of Triton. The derived area and volume describe a sphere; surface terrain and flattening are omitted.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
Triton dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 2,705 km | Not recorded | approximate | |
| 22,990,000 km² | Not recorded | derived | |
| 1.037 × 10¹⁰ km³ | Not recorded | derived | |
| 2.14 × 10¹⁹ t | Not recorded | derived | |
| 0.7808 m/s² | Not recorded | derived |
Around this scale
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These links use compatible length records, ordered around the selected value.
Nearest lower value · SpacePluto2,377 kmPluto is a dwarf planet in the Kuiper Belt, composed of rock and ice and orbiting the Sun.
Around the same scale · PlacesDanube2,850 kmThe Danube is a major river in central and eastern Europe, flowing from Germany's Black Forest to the Black Sea.
Nearest higher value · SpaceMoon3,475 kmThe Moon is Earth’s natural satellite and the brightest large object in Earth’s night sky.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.
More ways to see it
Curated comparisons
There’s always another scale
Follow your curiosity.
SpaceMoon3,475 kmThe Moon is Earth’s natural satellite and the brightest large object in Earth’s night sky.
SpaceEarth12,740 kmEarth is the rocky planet on which we live and the third planet from the Sun.SpacePluto2,377 kmPluto is a dwarf planet in the Kuiper Belt, composed of rock and ice and orbiting the Sun.
SpaceJupiter139,800 kmJupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.
SpaceEuropa3,122 kmEuropa is a natural satellite of Jupiter, with a smooth icy surface thought to cover a subsurface ocean.
SpaceIo3,643 kmIo is a natural satellite of Jupiter, covered with active volcanoes and sulphur deposits.
SpaceEris2,326 kmEris is a dwarf planet in the scattered disc region beyond Neptune, composed of rock and ice.PlacesDanube2,850 kmThe Danube is a major river in central and eastern Europe, flowing from Germany's Black Forest to the Black Sea.