Uranus

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Discovered by	William Herschel
Date of discovery	1781
Mass (kg)	8.686e+25
Mass (Earth = 1)	1.4535e+01
Equatorial radius (km)	25,559
Equatorial radius (Earth = 1)	4.0074
Mean density (gm/cm^3)	1.29
Mean distance from the Sun (km)	2,870,990,000
Mean distance from the Sun (Earth = 1)	19.1914
Rotational period (hours)	-17.9
Orbital period (years)	84.01
Mean orbital velocity (km/sec)	6.81
Orbital eccentricity	0.0461
Tilt of axis (degrees)	97.86
Orbital inclination (degrees)	0.774
Equatorial surface gravity (m/sec^2)	7.77
Equatorial escape velocity (km/sec)	21.30
Visual geometric albedo	0.51
Magnitude (Vo)	5.52
Mean cloud temperature	-193�C
Atmospheric pressure (bars)	1.2
Atmospheric composition Hydrogen Helium Methane	83% 15% 2%

The following is a summary of the rings of Uranus.

Name	Distance*	Width	Thickness	Mass	Albedo
1986U2R	38,000 km	2,500 km	0.1 km	?	0.03
6	41,840 km	1-3 km	0.1 km	?	0.03
5	42,230 km	2-3 km	0.1 km	?	0.03
4	42,580 km	2-3 km	0.1 km	?	0.03
Alpha	44,720 km	7-12 km	0.1 km	?	0.03
Beta	45,670 km	7-12 km	0.1 km	?	0.03
Eta	47,190 km	0-2 km	0.1 km	?	0.03
Gamma	47,630 km	1-4 km	0.1 km	?	0.03
Delta	48,290 km	3-9 km	0.1 km	?	0.03
1986U1R	50,020 km	1-2 km	0.1 km	?	0.03
Epsilon	51,140 km	20-100 km	< 0.15 km	?	0.03

*The distance is measured from the planet center to the start of the ring.

Uranus' Moon Summary

The following table summarizes the radius, mass, distance from the planet center, discoverer and the date of discovery of each of the moons of Uranus:

Moon	#	Radius (km)	Mass (kg)	Distance (km)	Discoverer	Date
Cordelia	VI	13	?	49,750	Voyager 2	1986
Ophelia	VII	16	?	53,760	Voyager 2	1986
Bianca	VIII	22	?	59,160	Voyager 2	1986
Cressida	IX	33	?	61,770	Voyager 2	1986
Desdemona	X	29	?	62,660	Voyager 2	1986
Juliet	XI	42	?	64,360	Voyager 2	1986
Portia	XII	55	?	66,100	Voyager 2	1986
Rosalind	XIII	27	?	69,930	Voyager 2	1986
Belinda	XIV	34	?	75,260	Voyager 2	1986
Puck	XV	77	?	86,010	Voyager 2	1985
Miranda	V	235.8	6.33e+19	129,780	G. Kuiper	1948
Ariel	I	578.9	1.27e+21	191,240	W. Lassell	1851
Umbriel	II	584.7	1.27e+21	265,970	W. Lassell	1851
Titania	III	788.9	3.49e+21	435,840	W. Herschel	1787
Oberon	IV	761.4	3.03e+21	582,600	W. Herschel	1787

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Copyright � 1998 Michael Ammar.