Vital Statistics for Saturn's Rings and Inner Satellites

Rings of Saturn

Feature	Boundaries (km)		Optical Depth	Notes
	Inner	Outer
D Ring	66,900	74,658	10^-5	Contains narrow ringlets at 67,580 and 71,710 km.
C Ring	74,658	91,975	0.05 to 0.35	Isolated "plateaus" among a surrounding, fainter ring.
Titan Ringlet	77,871	77,896		A narrow, eccentric ringlet inside a gap in the C Ring.
Maxwell Ringlet	87,491	87,555		A narrow, eccentric ringlet inside a gap in the C Ring.
1.470 Rs Ringlet	88,716	88,732		A narrow, eccentric ringlet inside a gap in the C Ring.
1.495 Rs Ringlet	90,171	90,232		A narrow, eccentric ringlet inside a gap in the C Ring.
B Ring	91,975	117,507	0.4 to 2.5	Contains fine structure on all scales. The most opaque of Saturn's rings.
Cassini Division	117,507	122,340	0 to 0.1	The prominent gap between the A and B Rings. It contains several features of low optical depth.
Huygens Ringlet	117,825	118,185		A narrow, eccentric ringlet near the inner edge of the Cassini Division.
A Ring	122,340	136,780	0.4 to 1.0	A fairly uniform ring with many density and bending waves near its outer edge.
Encke Gap	133,410	133,740	0	A gap in the A Ring "shepherded" open by the embedded moon Pan. One or more faint ringlets are also present.
Keeler Gap	136,510	136,550	0	An empty gap near the outer edge of the A Ring.
F Ring (core)	140,219		0.1 to 1	An eccentric ringlet containing clumps and kinks. Based on its eccentricity, its radial limits are 140,194 to 140,244 km.
G Ring	166,000	173,200	10^-6	A very faint, isolated dust ring.
E Ring	180,000	480,000	10^-6	A broad, faint dust ring encompassing the orbits of Mimas through Dione. Densest near the orbit of Enceladus. Up to ~ 30,000 km thick.

Inner Satellites of Saturn

Name	Semimajor Axis (km)	Period (days)	Eccentricity	Inclination (deg)	Mean Radius (km)	Mass (10^20 kg)
Pan	133,583	0.5750	~ 0	~ 0	10
Atlas	137,640	0.6019	~ 0	~ 0	16
Prometheus	139,350	0.612986	0.0024	0.0	50	0.0014
Pandora	141,700	0.628804	0.0042	0.0	42	0.0013
Epimetheus	151,422	0.694590	0.009	0.34	59	0.0055
Janus	151,472	0.694590	0.007	0.14	89	0.0198
Mimas	185,520	0.9424218	0.0202	1.53	199	0.385
Enceladus	238,020	1.370218	0.0045	0.02	249	0.73
Tethys	294,660	1.887802	0.0000	1.09	530	6.22
Telesto	294,660	1.887802	~ 0	~ 0	11
Calypso	294,660	1.887802	~ 0	~ 0	10
Dione	377,400	2.736915	0.0022	0.02	560	10.52
Helene	377,400	2.736915	0.005	0.2	16
Rhea	527,040	4.517500	0.0010	0.35	764	23.1
Titan	1,221,850	15.945421	0.0292	0.33	2575	1345.5
Hyperion	1,481,100	21.276609	0.1042	0.43	143
Iapetus	3,561,300	79.330183	0.0283	7.52	718	15.9
Phoebe	12,952,000	550.48	0.163	175.3	110

From Murray, C. D., and S. F. Dermott 1999. Solar System Dynamics, Cambridge University Press.

Saturn Overview | Search for Data | Rings Node Home