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Moon count, as of September 2026
How many moons does Uranus have?
29 known moons.
Uranus has 29 known moons as of September 2026, according to NASA and the JPL Solar System Dynamics group. The 27 largest are listed below; the other 2 are small moons, most only a few kilometres across and found since 2000, and many do not yet have names.
The named moons
Sorted by size. Distance is the average distance from the centre of Uranus.
| Moon | Diameter (miles / km) | Distance (miles / km) | One orbit | Discovered |
|---|---|---|---|---|
| Titania | 980 / 1,577 | 271,000 / 435,910 | 8.706 days | 1787, William Herschel |
| Oberon | 946 / 1,523 | 363,000 / 583,520 | 13.46 days | 1787, William Herschel |
| Umbriel | 726 / 1,169 | 165,000 / 266,000 | 4.144 days | 1851, William Lassell |
| Ariel | 720 / 1,158 | 119,000 / 191,020 | 2.52 days | 1851, William Lassell |
| Miranda | 293 / 472 | 80,400 / 129,390 | 1.413 days | 1948, Gerard Kuiper |
| Puck | 101 / 162 | 53,400 / 86,010 | 18 hours | 1985, Voyager 2 |
| Sycorax | 93.2 / 150 | 7,570,000 / 12,179,000 | 3.5 years | 1997, Brett Gladman and team |
| Portia | 83.9 / 135 | 41,100 / 66,097 | 12 hours | 1986, Voyager 2 |
| Juliet | 58.4 / 94 | 40,000 / 64,358 | 12 hours | 1986, Voyager 2 |
| Belinda | 55.9 / 90 | 46,800 / 75,256 | 15 hours | 1986, Voyager 2 |
| Cressida | 49.7 / 80 | 38,400 / 61,777 | 11 hours | 1986, Voyager 2 |
| Rosalind | 44.7 / 72 | 43,500 / 69,927 | 13 hours | 1986, Voyager 2 |
| Caliban | 44.7 / 72 | 4,490,000 / 7,231,000 | 1.6 years | 1997, Brett Gladman and team |
| Desdemona | 39.8 / 64 | 38,900 / 62,658 | 11 hours | 1986, Voyager 2 |
| Bianca | 31.7 / 51 | 36,800 / 59,166 | 10 hours | 1986, Voyager 2 |
| Prospero | 31.1 / 50 | 10,100,000 / 16,256,000 | 5.4 years | 1999, Matthew Holman and team |
| Setebos | 29.8 / 48 | 10,800,000 / 17,418,000 | 6.1 years | 1999, John Kavelaars and team |
| Ophelia | 26.7 / 43 | 33,400 / 53,764 | 9 hours | 1986, Voyager 2 |
| Cordelia | 24.9 / 40 | 30,900 / 49,770 | 8 hours | 1986, Voyager 2 |
| Stephano | 19.9 / 32 | 4,970,000 / 8,004,000 | 1.9 years | 1999, Brett Gladman and team |
| Perdita | 16.5 / 26.6 | 47,500 / 76,418 | 15 hours | 1999, Erich Karkoschka (identified in 1986 Voyager 2 images) |
| Francisco | 13.7 / 22 | 2,660,000 / 4,275,700 | -6408 hours | 2001, John Kavelaars, Matthew Holman, Dan Milisavljevic and Tommy Grav |
| Ferdinand | 13 / 21 | 12,700,000 / 20,421,400 | -66912 hours | 2001, Dan Milisavljevic, Matthew Holman, John Kavelaars and Tommy Grav |
| Margaret | 12.4 / 20 | 8,960,000 / 14,425,000 | 4.5 years | 2003, Scott Sheppard and David Jewitt |
| Trinculo | 11.2 / 18 | 5,280,000 / 8,502,600 | -17976 hours | 2001, Matthew Holman, John Kavelaars and Dan Milisavljevic |
| Mab | 11.2 / 18 | 60,700 / 97,737 | 22 hours | 2003, Mark Showalter and Jack Lissauer |
| Cupid | 11.2 / 18 | 46,200 / 74,396 | 15 hours | 2003, Mark Showalter and Jack Lissauer |
Why the number keeps changing
Big moons were found centuries ago through telescopes. The small ones, often only a few kilometres across, are found today by long camera exposures on the largest telescopes and by spacecraft. Each new batch is announced by the Minor Planet Center, so the count goes up in jumps. That is why every count on this site carries a date.