Notable moons of the solar system

name mean distance from centre of planet (orbital radius; km) orbital period (sidereal period; Earth days) radius or radial dimensions (km) year of discovery

Earth

Moon 384,400 27.3217 1,738 —

Mars

Phobos 9,378 0.31891 13.3 × 11.1 × 9.3 1877

Deimos 23,459 1.26244 7.5 × 6.1 × 5.2 1877

Jupiter

Amalthea 181,400 0.498 83.5 1892

Io 421,800 1.769 1,821.6 1610

Europa 671,100 3.551 1,560.8 1610

Ganymede 1,070,400 7.155 2,631.2 1610

Callisto 1,882,700 16.69 2,410.3 1610

Saturn

Mimas 185,520 0.942 199 1789

Enceladus 238,020 1.370 249 1789

Tethys 294,660 1.888 530 1684

Dione 377,400 2.737 560 1684

Rhea 527,040 4.518 764 1672

Titan 1,221,850 15.94 2,575 1655

Hyperion 1,481,100 21.28 185 × 140 × 113 1848

Iapetus 3,561,300 79.33 718 1671

Phoebe 12,952,000 550.4 110 1899

Uranus

Miranda 129,800 1.413 235 1948

Ariel 191,240 2.520 580 1851

Umbriel 265,970 4.144 585 1851

Titania 435,840 8.706 789 1787

Oberon 582,600 13.463 761 1787

Neptune

Triton 354,800 5.8768 1,353.40 1846

Nereid 5,513,400 360.1468 170 1949

Pluto

Charon 19,640 6.3873 625 1978