Uranus' natural satellites

The first two moons (Titania and Oberon) were discovered by William Herschel on March 13, 1787. Two more moons (Ariel and Umbriel) were discovered by William Lassell in 1851. In 1852, Herschel's son John Herschel gave the four then-known moons their names. In 1948 Gerard Kuiper discovered the moon Miranda.

All moons of Uranus are named after characters from Shakespeare or Alexander Pope. Titania and Oberon are characters from Shakespeare's A Midsummer Nights Dream.

The flyby of the Voyager 2 space probe in January 1986 led to the discovery of a further 10 moons, and another satellite S/1986 U 10 was later found after studying old Voyager photographs. Eleven additional moons have since been identified using telescopes.

Uranus' natural satellites
Name	Diameter (km)	Mass (kg)	Mean orbital radius (km)	Orbital period
Cordelia	40	4.5 × 10¹⁶ ?	49,770	0.335034 days
Ophelia	42	5.4 × 10¹⁶ ?	53,790	0.376400 days
Bianca	51	9.3 × 10¹⁶ ?	59,170	0.434579 days
Cressida	80	3.43 × 10¹⁷ ?	61,780	0.463570 days
Desdemona	64	1.78 × 10¹⁷ ?	62,680	0.473650 days
Juliet	93	5.57 × 10¹⁷ ?	64,350	0.493065 days
Portia	135	1.68 × 10¹⁸ ?	66,090	0.513196 days
Rosalind	72	2.54 × 10¹⁷ ?	69,940	0.558460 days
S/2003 U2^*	10	Unknown	74,800	0.618 days
Belinda	80	3.57 × 10¹⁷ ?	75,260	0.623527 days
S/1986 U10^*	20	Unknown	76,420	0.638 days
Puck	162	2.89 × 10¹⁸ ?	86,010	0.761833 days
S/2003 U1^*	10	Unknown	97,734	0.923 days
Miranda	472	6.6 × 10¹⁹	129,390	1.413479 days
Ariel	1158	1.35 × 10²¹	191,020	2.520379 days
Umbriel	1170	1.17 × 10²¹	266,300	4.144177 days
Titania	1578	3.52 × 10²¹	435,910	8.705872 days
Oberon	1523	3.01 × 10²¹	583,520	13.463239 days
S/2001 U3^*	12	Unknown	4,276,000	-266.6 days^**
Caliban	98	7.3 × 10¹⁷ ?	7,231,000	-579.7 days^**
Stephano	20	6 × 10¹⁵ ?	8,004,000	-677.4 days^**
Trinculo	10	Unknown	8,504,000	-759.0 days^**
Sycorax	190	5.4 × 10¹⁸ ?	12,179,000	-1288.3 days^**
S/2003 U3^*	11	Unknown	14,345,000	1694.8 days
Prospero	30	2.1 × 10¹⁶ ?	16,256,000	-1977.3 days^**
Setebos	30	2.1 × 10¹⁶ ?	17,418,000	-2234.8 days^**
S/2001 U2^*	12	Unknown	20,901,000	-2823.4 days^**

^*Awaiting confirmation and naming

^**negative orbital periods indicate a retrograde orbit around Uranus (opposite to the planet's rotation)

Sources: [1] , [2]

Note: These sources give no information on the masses for the small satellites; some data have changed greatly so it is unlikely that these old values are correct.

Naming notes

Some asteroids share the same names as moons of Uranus: 171 Ophelia, 218 Bianca, 593 Titania, 666 Desdemona, 2758 Cordelia.

Uranus' natural satellites

Naming notes

See also