Physical data for the 20 largest moons in the Solar System ranked by diameter, with parent planet, mass, orbital period, and discovery year.
Moon | Planet | Diameter (km) | Mass (10^21 kg) | Orbital Period (days) | Discovery Year |
|---|---|---|---|---|---|
| Ganymede | Jupiter | 5268 | 148.2 | 7.15 | 1610 |
| Titan | Saturn | 5150 | 134.5 | 15.95 | 1655 |
| Callisto | Jupiter | 4821 | 107.6 | 16.69 | 1610 |
| Io | Jupiter | 3643 | 89.3 | 1.77 | 1610 |
| Moon | Earth | 3475 | 73.4 | 27.32 | Prehistoric |
| Europa | Jupiter | 3122 | 48.0 | 3.55 | 1610 |
| Triton | Neptune | 2707 | 21.4 | 5.88 | 1846 |
| Titania | Uranus | 1578 | 3.4 | 8.71 | 1787 |
| Rhea | Saturn | 1527 | 2.31 | 4.52 | 1672 |
| Oberon | Uranus | 1523 | 3.08 | 13.46 | 1787 |
| Iapetus | Saturn | 1469 | 1.81 | 79.32 | 1671 |
| Charon | Pluto | 1212 | 1.59 | 6.39 | 1978 |
| Umbriel | Uranus | 1169 | 1.28 | 4.14 | 1851 |
| Ariel | Uranus | 1158 | 1.25 | 2.52 | 1851 |
| Dione | Saturn | 1123 | 1.10 | 2.74 | 1684 |
| Tethys | Saturn | 1062 | 0.617 | 1.89 | 1684 |
| Enceladus | Saturn | 504 | 0.108 | 1.37 | 1789 |
| Miranda | Uranus | 471 | 0.066 | 1.41 | 1948 |
| Proteus | Neptune | 420 | 0.044 | 1.12 | 1989 |
| Mimas | Saturn | 396 | 0.0379 | 0.94 | 1789 |