| Uranus Statistics | |
|---|---|
| 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
|
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.
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 |