List of Uranus' moons facts for kids

Schematic of the Uranian moon–ring system

The Uranian moons are listed below by orbital period, from shortest to longest. Moons massive enough for their surfaces to have collapsed into a spheroid are highlighted in light blue and bolded. The inner and major moons all have prograde orbits. Irregular moons with retrograde orbits are shown in dark grey. Margaret, the only known irregular moon of Uranus with a prograde orbit, is shown in light grey. The orbits and mean distances of the irregular moons are variable over short timescales due to frequent planetary and solar perturbations, therefore the listed orbital elements of all irregular moons are averaged over a 8,000-year numerical integration by Brozović and Jacobson (2009). These may differ from osculating orbital elements provided by other sources. Otherwise, recently-discovered irregular moons without published proper elements are temporarily listed here with inaccurate osculating orbital elements that are italicized to distinguish them from other irregular moons with proper orbital elements. Their orbital elements are all based on the epoch of 1 January 2000 Terrestrial Time.

Uranian moons

Label	Name	Pronunciation (key)	Image	Abs. magn.	Diameter (km)	Mass (× 1016 kg)	Semi-major axis (km)	Orbital period (d)	Inclination (°)	Eccentricity	Discovery year	Year announced	Discoverer	Group
VI	Cordelia			10.3	40 ± 6 (50 × 36)	≈ 4.4	49770	+0.33503	0.08479°	0.00026	1986	1986	Terrile (Voyager 2)	ε ring shepherd
VII	Ophelia			10.2	43 ± 8 (54 × 38)	≈ 5.3	53790	+0.37640	0.1036°	0.00992	1986	1986	Terrile (Voyager 2)	ε ring shepherd
VIII	Bianca			9.8	51 ± 4 (64 × 46)	≈ 9.2	59170	+0.43458	0.193°	0.00092	1986	1986	Smith (Voyager 2)	Portia
IX	Cressida			8.9	80 ± 4 (92 × 74)	≈ 34	61780	+0.46357	0.006°	0.00036	1986	1986	Synnott (Voyager 2)	Portia
X	Desdemona			9.3	64 ± 8 (90 × 54)	≈ 18	62680	+0.47365	0.11125°	0.00013	1986	1986	Synnott (Voyager 2)	Portia
XI	Juliet			8.5	94 ± 8 (150 × 74)	≈ 56	64350	+0.49307	0.065°	0.00066	1986	1986	Synnott (Voyager 2)	Portia
XII	Portia			7.7	135 ± 8 (156 × 126)	≈ 170	66090	+0.51320	0.059°	0.00005	1986	1986	Synnott (Voyager 2)	Portia
XIII	Rosalind			9.1	72 ± 12	≈ 25	69940	+0.55846	0.279°	0.00011	1986	1986	Synnott (Voyager 2)	Portia
XXVII	Cupid			12.6	≈ 18	≈ 0.38	74800	+0.61800	0.100°	0.0013	2003	2003	Showalter and Lissauer	Belinda
XIV	Belinda			8.8	90 ± 16 (128 × 64)	≈ 49	75260	+0.62353	0.031°	0.00007	1986	1986	Synnott (Voyager 2)	Belinda
XXV	Perdita			11.0	30 ± 6	≈ 1.8	76400	+0.63800	0.0°	0.0012	1999	1999	Karkoschka (Voyager 2)	Belinda
XV	Puck			7.3	162 ± 4	≈ 290	86010	+0.76183	0.3192°	0.00012	1985	1986	Synnott (Voyager 2)
XXVI	Mab			12.1	≈ 18	≈ 0.38	97700	+0.92300	0.1335°	0.0025	2003	2003	Showalter and Lissauer	μ ring source
V	Miranda♠			3.5	471.6 ± 1.4 (481 × 468 × 466)	6400±300	129390	+1.41348	4.232°	0.0013	1948	1948	Kuiper
I	Ariel♠			1.0	1157.8±1.2 (1162 × 1156 × 1155)	125100±2100	191020	+2.52038	0.260°	0.0012	1851	1851	Lassell
II	Umbriel♠			1.7	1169.4±5.6	127500±2800	266300	+4.14418	0.205°	0.0039	1851	1851	Lassell
III	Titania♠			0.8	1576.8±1.2	340000±6100	435910	+8.70587	0.340°	0.0011	1787	1787	Herschel
IV	Oberon♠			1.0	1522.8±5.2	307600±8700	583520	+13.4632	0.058°	0.0014	1787	1787	Herschel
XXII	Francisco‡			12.4	≈ 22	≈ 0.72	4282900	−267.09	147.250°	0.1324	2001	2003	Holman et al.
XVI	Caliban♦			9.1	42+20 −12	≈ 25	7231100	−579.73	141.529°	0.1812	1997	1997	Gladman et al.	Caliban
	S/2023 U 1♦			13.7	≈ 8	≈ 0.034	7978000	−680.76	141.893°	0.1867	2023	2024	Sheppard et al.	Caliban
XX	Stephano♦			9.7	≈ 32	≈ 2.2	8007400	−677.47	143.819°	0.2248	1999	1999	Gladman et al.	Caliban
XXI	Trinculo‡			12.7	≈ 18	≈ 0.39	8505200	−749.40	166.971°	0.2194	2001	2002	Holman et al.
XVII	Sycorax‡			7.4	157+23 −15	≈ 230	12179400	−1288.38	159.420°	0.5219	1997	1997	Nicholson et al.
XXIII	Margaret†			12.7	≈ 20	≈ 0.54	14146700	+1661.00	57.367°	0.6772	2003	2003	Sheppard and Jewitt
XVIII	Prospero‡			10.5	≈ 50	≈ 8.5	16276800	−1978.37	151.830°	0.4445	1999	1999	Holman et al.
XIX	Setebos‡			10.7	≈ 48	≈ 7.5	17420400	−2225.08	158.235°	0.5908	1999	1999	Kavelaars et al.
XXIV	Ferdinand‡			12.5	≈ 12	≈ 0.54	20430000	−2790.03	169.793°	0.3993	2001	2003	Holman et al.

Sources: NASA/NSSDC, Sheppard, et al. 2005. For the outer irregular moons, the most accurate orbital data can be generated with the Minor Planet Center's Natural Satellites Ephemeris Service. The irregulars are significantly perturbed by the Sun.