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.

Key
Inner moons	♠ Major moons	† Ungrouped prograde irregular moons	‡ Ungrouped retrograde irregular moons	♦ Caliban group

Uranian moons
Label	Name	Abs. magn.	Diameter (km)	Mass (× 10¹⁶ kg)	Semi-major axis (km)	Orbital period (d)	Inclination (°)	Eccentricity	Discovery year	Year announced	Discoverer	Group
06 VI	Cordelia	10.3	0040 40 ± 6 (50 × 36)	000004 ≈ 4.4	00049000 49770	0000.33 +0.33503	000.084 0.08479°	0.00026	1986	1986	Terrile (Voyager 2)	ε ring shepherd
07 VII	Ophelia	10.2	0043 43 ± 8 (54 × 38)	000005 ≈ 5.3	00053000 53790	0000.37 +0.37640	000.103 0.1036°	0.00992	1986	1986	Terrile (Voyager 2)	ε ring shepherd
08 VIII	Bianca	9.8	0051 51 ± 4 (64 × 46)	000009 ≈ 9.2	00059000 59170	0000.43 +0.43458	000.193 0.193°	0.00092	1986	1986	Smith (Voyager 2)	Portia
09 IX	Cressida	8.9	0080 80 ± 4 (92 × 74)	000034 ≈ 34	00061000 61780	0000.46 +0.46357	000.006 0.006°	0.00036	1986	1986	Synnott (Voyager 2)	Portia
10 X	Desdemona	9.3	0064 64 ± 8 (90 × 54)	000018 ≈ 18	00062000 62680	0000.47 +0.47365	000.111 0.11125°	0.00013	1986	1986	Synnott (Voyager 2)	Portia
11 XI	Juliet	8.5	0094 94 ± 8 (150 × 74)	000056 ≈ 56	00064000 64350	0000.49 +0.49307	000.065 0.065°	0.00066	1986	1986	Synnott (Voyager 2)	Portia
12 XII	Portia	7.7	0135 135 ± 8 (156 × 126)	000170 ≈ 170	00066000 66090	0000.51 +0.51320	000.059 0.059°	0.00005	1986	1986	Synnott (Voyager 2)	Portia
13 XIII	Rosalind	9.1	0072 72 ± 12	000025 ≈ 25	00069000 69940	0000.55 +0.55846	000.279 0.279°	0.00011	1986	1986	Synnott (Voyager 2)	Portia
27 XXVII	Cupid	12.6	0018 ≈ 18	000000.38 ≈ 0.38	00074000 74800	0000.61 +0.61800	000.100 0.100°	0.0013	2003	2003	Showalter and Lissauer	Belinda
14 XIV	Belinda	8.8	0090 90 ± 16 (128 × 64)	000049 ≈ 49	00075000 75260	0000.62 +0.62353	000.031 0.031°	0.00007	1986	1986	Synnott (Voyager 2)	Belinda
25 XXV	Perdita	11.0	0030 30 ± 6	000002 ≈ 1.8	00076000 76400	0000.63 +0.63800	000 0.0°	0.0012	1999	1999	Karkoschka (Voyager 2)	Belinda
15 XV	Puck	7.3	0162 162 ± 4	000290 ≈ 290	00086000 86010	0000.76 +0.76183	000.319 0.3192°	0.00012	1985	1986	Synnott (Voyager 2)
26 XXVI	Mab	12.1	0018 ≈ 18	000000.38 ≈ 0.38	00097000 97700	0000.92 +0.92300	000.133 0.1335°	0.0025	2003	2003	Showalter and Lissauer	μ ring source
05 V	Miranda^♠	3.5	0470 471.6 ± 1.4 (481 × 468 × 466)	006600 6400±300	00129000 129390	0001.4 +1.41348	004 4.232°	0.0013	1948	1948	Kuiper
01 I	Ariel^♠	1.0	1157 1157.8±1.2 (1162 × 1156 × 1155)	125000 125100±2100	00191000 191020	0002.5 +2.52038	000.260 0.260°	0.0012	1851	1851	Lassell
02 II	Umbriel^♠	1.7	1169 1169.4±5.6	127000 127500±2800	00266000 266300	0004.1 +4.14418	000.205 0.205°	0.0039	1851	1851	Lassell
03 III	Titania^♠	0.8	1577 1576.8±1.2	340000 340000±6100	00435000 435910	0008.7 +8.70587	000.340 0.340°	0.0011	1787	1787	Herschel
04 IV	Oberon^♠	1.0	1522 1522.8±5.2	301000 307600±8700	00583000 583520	0013 +13.4632	000.058 0.058°	0.0014	1787	1787	Herschel
22 XXII	Francisco^‡	12.4	0022 ≈ 22	000000.72 ≈ 0.72	04282900 4282900	0267 −267.09	147.250°	0.1324	2001	2003	Holman et al.
16 XVI	Caliban^♦	9.1	0042 42+20 −12	000025 ≈ 25	07231100 7231100	0579 −579.73	141.529°	0.1812	1997	1997	Gladman et al.	Caliban
99	S/2023 U 1^♦	13.7	0008 ≈ 8	000000.034 ≈ 0.034	7978000 7978000	680.76 −680.76	141.893°	0.1867	2023	2024	Sheppard et al.	Caliban
20 XX	Stephano^♦	9.7	0032 ≈ 32	000002.2 ≈ 2.2	08007400 8007400	0677 −677.47	143.819°	0.2248	1999	1999	Gladman et al.	Caliban
21 XXI	Trinculo^‡	12.7	0018 ≈ 18	000000.39 ≈ 0.39	08505200 8505200	0749 −749.40	166.971°	0.2194	2001	2002	Holman et al.
17 XVII	Sycorax^‡	7.4	0157 157+23 −15	000230 ≈ 230	12179400 12179400	1288 −1288.38	159.420°	0.5219	1997	1997	Nicholson et al.
23 XXIII	Margaret^†	12.7	0020 ≈ 20	000000.54 ≈ 0.54	14146700 14146700	1661 +1661.00	57.367°	0.6772	2003	2003	Sheppard and Jewitt
18 XVIII	Prospero^‡	10.5	0050 ≈ 50	000008.5 ≈ 8.5	16276800 16276800	1978 −1978.37	151.830°	0.4445	1999	1999	Holman et al.
19 XIX	Setebos^‡	10.7	0048 ≈ 48	000007.5 ≈ 7.5	17420400 17420400	2225 −2225.08	158.235°	0.5908	1999	1999	Kavelaars et al.
24 XXIV	Ferdinand^‡	12.5	0012 ≈ 12	000000.54 ≈ 0.54	20430000 20430000	2790 −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.

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List of Uranus' moons Facts for Kids. Kiddle Encyclopedia.

List of Uranus' moons facts for kids