| Feature | Middle Boundary (km) | Width | Eccentricity | Inclination (deg) | Optical Depth | Notes |
|---|---|---|---|---|---|---|
| Six | 41,837 | 1.5 | 0.00101 | 0.062 | ~ 0.3 | |
| Five | 42,234 | ~ 2 | 0.00190 | 0.054 | ~ 0.5 | |
| Four | 42,571 | ~ 2 | 0.001065 | 0.032 | ~ 0.3 | |
| Alpha | 44,718 | 4 to 10 | 0.00076 | 0.015 | ~ 0.4 | |
| Beta | 45,661 | 5 to 11 | 0.00044 | 0.005 | ~ 0.3 | |
| Eta | 47,176 | 1.6 | ≤ 0.4 | |||
| Gamma | 47,627 | 1 to 4 | 0.00109 | 0.000 | ≥ 0.3 | Shape also contains an m=0 mode of 5.15 km amplitude [3]. |
| Delta | 48,300 | 3 to 7 | 0.00004 | 0.001 | ~ 0.5 | Shape also contains an m=2 mode of 3.11 km amplitude [3]. |
| Lambda | 50,024 | ~ 2 | 0. | 0. | ~ 0.1 | Contains clumps. |
| Epsilon | 51,149 | 20 to 96 | 0.00794 | 0.000 | 0.5 to 2.3 | Shepherded by |
| Cordelia and Ophelia. R/2003 U 2 | 67,300 | 3800 | 0 | 0 | 0.000006 | Very faint; bounded by Portia and Rosalind. |
| R/2003 U 1 | 97,700 | 17,000 | 0 | 0 | 0.000008 | Very faint; peaks at the orbit of Mab. |
| Name | Semimajor Axis (km) | Period (days) | Eccentricity | Inclination (deg) | Mean Radius (km) | Mass (10^20 kg) |
|---|---|---|---|---|---|---|
| Cordelia | 49,752 | 0.3350331 | 0.000 | 0.1 | 13 | |
| Ophelia | 53,764 | 0.3764089 | 0.010 | 0.1 | 16 | |
| Bianca | 59,165 | 0.4345772 | 0.00027 | 0.18 | 27 | |
| Cressida | 61,767 | 0.4635700 | 0.00020 | 0.038 | 41 | |
| Desdemona | 62,659 | 0.4736510 | 0.00034 | 0.098 | 35 | |
| Juliet | 64,358 | 0.4930660 | 0.00005 | 0.045 | 53 | |
| Portia | 66,097 | 0.5131958 | 0.00051 | 0.026 | 70 | |
| Rosalind | 69,927 | 0.5584589 | 0.00058 | 0.093 | 36 | |
| Cupid | 74,392 | 0.6128252 | 0 | 0 | 9 | |
| Belinda | 75,256 | 0.6235248 | 0.00028 | 0.027 | 45 | |
| Perdita | 76,417 | 0.6380191 | 0.00329 | 0.068 | 13 | |
| Puck | 86,004 | 0.7618321 | 0.00039 | 0.321 | 81 | |
| Mab | 97,736 | 0.9229583 | 0.00254 | 0.14 | 12 | |
| Miranda | 129,800 | 1.413 | 0.0027 | 4.22 | 235 | 0.659 |
| Ariel | 191,200 | 2.520 | 0.0034 | 0.31 | 579 | 13.53 |
| Umbriel | 266,000 | 4.144 | 0.0050 | 0.36 | 585 | 11.72 |
| Titania | 435,800 | 8.706 | 0.0022 | 0.10 | 789 | 35.27 |
| Oberon | 583,600 | 13.463 | 0.0008 | 0.10 | 761 | 30.14 |
Sources:
French, R. G., P. D. Nicholson, C. C. Porco, and E. A. Marouf. Dynamics and Structure of the Uranian Rings. In Uranus (J. T. Bergstralh, E. D. Miner, and M. S. Matthews, Eds.), University of Arizona Press, pp. 327-409.
Karkoschka, E. 2001. Voyager’s eleventh discovery of a satellite of Uranus and photometry and the first size measurements of nine satellites. Icarus 151, 69-77.
Murray, C. D., and S. F. Dermott 1999. Solar System Dynamics, Cambridge University Press.
Showalter and Lissauer 2006. The second ring-moon system of Uranus: Discovery and dynamics. Science, in press.