Ganymede (Moon of Jupiter)
5,262.4 km (3,270 mi)
Diameter (twice the mean radius)
The largest moon in the Solar System. Diameter: 5,262 km, the largest moon in the Solar System.
Published
How big is that?
5,262.4 km is 1.5 times the Moon and 41% of Earth.
Ganymede is the 10th largest of the 39 Cosmic Scale objects, and the 10th largest of the 109 objects across all three SizeItUp games.
Size comparison
To scale, smallest to largest: Ganymede in orange beside the Cosmic Scale objects nearest in size, in teal.
| Object | Size | vs Ganymede |
|---|---|---|
| MercuryThe smallest planet and the closest to the Sun. | 4,879 km across | 93% of the size |
| Titan (Moon of Saturn)Saturn's giant moon, wrapped in a thick orange haze. Measured at its solid surface. | 5,150 km across | about the same |
| Ganymede (Moon of Jupiter) | 5,262.4 km across | – |
| MarsThe red planet, home of Olympus Mons. | 6,792 km across | 1.3× bigger |
| VenusEarth's neighbour, wrapped in thick clouds. | 12,104 km across | 2.3× bigger |
In other units
| Metres | 5,262,400 |
|---|---|
| Kilometres | 5,262.4 |
| Feet | 17,270,000 |
| Miles | 3,270 |
How it's measured
Diameter (twice the mean radius). NASA Jovian Satellite Fact Sheet: radius 2,631.2 km.
Fact sheets list a radius; the diameter here is twice that.
Sources
- nssdc.gsfc.nasa.gov: Ganymede (III): radius 2,631.2 km.
Checked against the source on .
Could you have guessed it by eye?
Ganymede 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.