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List of Uranus' moons facts for kids

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Uranian rings scheme
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 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 Cordeliamoon.png 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 Opheliamoon.png 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 Biancamoon.png 9.8 51 ± 4
(64 × 46)
≈ 9.2 59170 +0.43458 0.193° 0.00092 1986 1986 Smith
(Voyager 2)
Portia
IX Cressida Cressida.png 8.9 80 ± 4
(92 × 74)
≈ 34 61780 +0.46357 0.006° 0.00036 1986 1986 Synnott
(Voyager 2)
Portia
X Desdemona Desdemonamoon.png 9.3 64 ± 8
(90 × 54)
≈ 18 62680 +0.47365 0.11125° 0.00013 1986 1986 Synnott
(Voyager 2)
Portia
XI Juliet Julietmoon.png 8.5 94 ± 8
(150 × 74)
≈ 56 64350 +0.49307 0.065° 0.00066 1986 1986 Synnott
(Voyager 2)
Portia
XII Portia Portia1.jpg 7.7 135 ± 8
(156 × 126)
≈ 170 66090 +0.51320 0.059° 0.00005 1986 1986 Synnott
(Voyager 2)
Portia
XIII Rosalind Rosalindmoon.png 9.1 72 ± 12 ≈ 25 69940 +0.55846 0.279° 0.00011 1986 1986 Synnott
(Voyager 2)
Portia
XXVII Cupid Cupidmoon.png 12.6 ≈ 18 ≈ 0.38 74800 +0.61800 0.100° 0.0013 2003 2003 Showalter and
Lissauer
Belinda
XIV Belinda
Belinda.gif
8.8 90 ± 16
(128 × 64)
≈ 49 75260 +0.62353 0.031° 0.00007 1986 1986 Synnott
(Voyager 2)
Belinda
XXV Perdita Perditamoon.png 11.0 30 ± 6 ≈ 1.8 76400 +0.63800 0.0° 0.0012 1999 1999 Karkoschka
(Voyager 2)
Belinda
XV Puck
Puck.png
7.3 162 ± 4 ≈ 290 86010 +0.76183 0.3192° 0.00012 1985 1986 Synnott
(Voyager 2)
XXVI Mab
Mabmoon.png
12.1 ≈ 18 ≈ 0.38 97700 +0.92300 0.1335° 0.0025 2003 2003 Showalter and
Lissauer
μ ring source
V Miranda
Miranda - January 24 1986 (30906319004).jpg
3.5 471.6 ± 1.4
(481 × 468 × 466)
6400±300 129390 +1.41348 4.232° 0.0013 1948 1948 Kuiper
I Ariel
Ariel (moon).jpg
1.0 1157.8±1.2
(1162 × 1156 × 1155)
125100±2100 191020 +2.52038 0.260° 0.0012 1851 1851 Lassell
II Umbriel
PIA00040 Umbrielx2.47.jpg
1.7 1169.4±5.6 127500±2800 266300 +4.14418 0.205° 0.0039 1851 1851 Lassell
III Titania
Titania (moon) color, cropped.jpg
0.8 1576.8±1.2 340000±6100 435910 +8.70587 0.340° 0.0011 1787 1787 Herschel
IV Oberon
Voyager 2 picture of Oberon.jpg
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 Caliban discovery.jpg 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 Stephano - Uranus moon.jpg 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 Sycorax.jpg 7.4 157+23
−15
≈ 230 12179400 −1288.38 159.420° 0.5219 1997 1997 Nicholson et al.
XXIII Margaret S2003u3acircle.gif 12.7 ≈ 20 ≈ 0.54 14146700 +1661.00 57.367° 0.6772 2003 2003 Sheppard and
Jewitt
XVIII Prospero Prospero - Uranus moon.jpg 10.5 ≈ 50 ≈ 8.5 16276800 −1978.37 151.830° 0.4445 1999 1999 Holman et al.
XIX Setebos Uranus - Setebos image.jpg 10.7 ≈ 48 ≈ 7.5 17420400 −2225.08 158.235° 0.5908 1999 1999 Kavelaars et al.
XXIV Ferdinand Uranus moon 021002 02.jpg 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.

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