Ganymede
Ganymede is a natural satellite of Jupiter and contains a magnetic field generated by its partially liquid core.
How big is it?
5,262 km across
Mean diameter · approximate
A little perspective
About the same scale as Titan.
Titan: Titan is a natural satellite of Saturn, with a thick nitrogen-rich atmosphere and surface lakes of hydrocarbons.
Measurements, assumptions & sources +
Ganymede
Rounded mean-radius model of Ganymede. 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.
Titan
Rounded mean-radius model of Titan. 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.
Change your perspective
Put it next to…
Choose a suggestion to redraw the comparison, or open its page to learn what it is.
Why this measurement?
Why we use 5,262 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 Ganymede. 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
Ganymede dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 5,262 km | Not recorded | approximate | |
| 87,000,000 km² | Not recorded | derived | |
| 7.63 × 10¹⁰ km³ | Not recorded | derived | |
| 1.481 × 10²⁰ t | Not recorded | derived | |
| 1.428 m/s² | Not recorded | derived |
Around this scale
Go smaller. Go bigger.
These links use compatible length records, ordered around the selected value.
Nearest lower value · SpaceTitan5,150 kmTitan is a natural satellite of Saturn, with a thick nitrogen-rich atmosphere and surface lakes of hydrocarbons.
Around the same scale · SpaceMoon3,475 kmThe Moon is Earth’s natural satellite and the brightest large object in Earth’s night sky.
Nearest higher value · PlacesOb–Irtysh system5,410 kmThe Ob–Irtysh system is a river network in western Siberia, Russia and Kazakhstan, formed by the Ob River and its main tributary, the Irtysh.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.SpaceTitan5,150 kmTitan is a natural satellite of Saturn, with a thick nitrogen-rich atmosphere and surface lakes of hydrocarbons.
SpaceMercury4,879 kmMercury is a rocky planet orbiting closest to the Sun in the Solar System.
SpaceCallisto4,821 kmCallisto is a natural satellite of Jupiter, with a heavily cratered icy surface.
SpaceMars6,779 kmMars is a rocky planet orbiting the Sun, with a reddish surface due to iron oxide.