Callisto (Moon of Jupiter)
4,820.6 km (2,995 mi)
Diameter (twice the radius)
Jupiter's battered outer giant moon, covered in craters. Diameter: 4,821 km, almost as wide as Mercury.
Published
How big is that?
4,820.6 km is 1.4 times the Moon and 38% of Earth.
Callisto is the 13th largest of the 39 Cosmic Scale objects, and the 13th largest of the 109 objects across all three SizeItUp games.
Size comparison
To scale, smallest to largest: Callisto in orange beside the Cosmic Scale objects nearest in size, in teal.
| Object | Size | vs Callisto |
|---|---|---|
| Io (Moon of Jupiter)The most volcanic world in the Solar System. | 3,643 km across | 76% of the size |
| Valles Marineris (Mars)The great canyon system of Mars, seen from above and measured end to end. | 3,870 km long | 80% of the size |
| Callisto (Moon of Jupiter) | 4,820.6 km across | – |
| MercuryThe smallest planet and the closest to the Sun. | 4,879 km across | about the same |
| Titan (Moon of Saturn)Saturn's giant moon, wrapped in a thick orange haze. Measured at its solid surface. | 5,150 km across | 1.1× bigger |
In other units
| Metres | 4,820,600 |
|---|---|
| Kilometres | 4,820.6 |
| Feet | 15,820,000 |
| Miles | 2,995 |
How it's measured
Diameter (twice the radius). NASA Jovian Satellite Fact Sheet: radius 2,410.3 km.
Fact sheets list a radius; the diameter here is twice that.
Sources
- nssdc.gsfc.nasa.gov: Callisto (IV): radius 2410.3 km.
Checked against the source on .
Could you have guessed it by eye?
Callisto 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.