Astrogeology Research Program

Gazetteer of Planetary Nomenclature

System	Name	Distance (km) from planet's center	Radial Width (km)
Rings of Jupiter
	1979 J1R ("Halo")	100,000 - 122,800	22,800
	1979 J2R ("Main")	122,800 - 129,200	6,400
	1979 J3R ("Gossamer")	129,200 - 214,200	85,000

Rings of Saturn Divisions are the separations between named rings, and gaps are the spaces within named rings. In general, divisions are large, gaps are small.
	D	67,000 - 74,490	7,500
	C	74,490 - 91,980	17,500
	Colombo Gap	77,800	100
	Maxwell Gap	87,500	270
	B	91,980 - 117,500	25,500
	Cassini Division	117,500 - 122,050	4,700
	Huygens Gap	117,680	285-440
	A	122,050 - 136,770	14,600
	Encke Gap	133,570	325
	Keeler Gap	136,530	35
	Roche Division	136,770-139,380	2600
	F	140,224	30-500
	G	166,000 - 174,000	8,000
	E	180,000 - 480,000	300,000

Rings of Uranus
	Zeta (1986 U2R)	39,600	3,500 (plus 5,000 km extension inwards)
	6	41,840	1-3
	5	42,230	2-3
	4	42,580	2-3
	Alpha	44,720	7-12
	Beta	45,670	7-12
	Eta	47,190	0-2
	Gamma	47,630	1-4
	Delta	48,290	3-9
	Lambda (1986 U1R)	50,020	1-2
	Epsilon	51,140	20-100
	Nu (R/2003 U 2)	67,300	3,800
	Mu (R/2003 U 1)	97,700	17,000

Rings and ring arcs of Neptune
	1989 N3R Galle	41,900	15
	1989 N2R Leverrier	53,200	15
	Lassell	55,400	-
	Arago	57,600	-
	1989 N1R Adams	62,930	< 50
	Liberte ("Leading" arc)	62,900	-
	Egalite ("Equidistant" arc)	62,900	-
	Fraternite ("Following" arc)	62,900	-
	Courage (arc)	62,900	-