Triton (Moon of Neptune)
2,706.8 km (1,682 mi)
Diameter (twice the radius)
Neptune's largest moon, which orbits backwards. Diameter: 2,707 km.
Published
How big is that?
2,706.8 km is 306 times Mount Everest and 78% of the Moon.
Triton is the 18th largest of the 39 Cosmic Scale objects, and the 18th largest of the 109 objects across all three SizeItUp games.
Size comparison
To scale, smallest to largest: Triton in orange beside the Cosmic Scale objects nearest in size, in teal.
| Object | Size | vs Triton |
|---|---|---|
| Charon (Moon of Pluto)Pluto's largest moon, half its size. | 1,214 km across | 45% of the size |
| Pluto (Dwarf planet)The dwarf planet at the edge of the classical Solar System, with a heart-shaped plain. | 2,376 km across | 88% of the size |
| Triton (Moon of Neptune) | 2,706.8 km across | – |
| Europa (Moon of Jupiter)An icy moon with an ocean hidden under its cracked crust. | 3,121.6 km across | 1.2× bigger |
| The MoonEarth's only natural satellite. | 3,475 km across | 1.3× bigger |
In other units
| Metres | 2,706,800 |
|---|---|
| Kilometres | 2,706.8 |
| Feet | 8,881,000 |
| Miles | 1,682 |
How it's measured
Diameter (twice the radius). NASA Neptunian Satellite Fact Sheet: radius 1,353.4 km.
Fact sheets list a radius; the diameter here is twice that.
Sources
- nssdc.gsfc.nasa.gov: Triton (NI): radius 1,353.4 km.
Checked against the source on .
Could you have guessed it by eye?
Triton is one of the objects in Cosmic Scale, a daily size comparison game: you stretch a shape to the size you think is right beside one you know.