Planetary Satellites

Satellite Name	*Discoverer*	*Diameter*	Distance from Jupiter	Orbital Period (days)
Metis	Synnott (V1),1979	40 km/25 mi	127,960 km/79,510 mi	.29
Adrastea	Jewitt,Danielson 1979	25 km/16 mi	128,980 km/80,140mi	.30
Amalthea	Barnard, 1892	170 km/106 mi	181,300 km/112,660 mi	.50
Thebe	Synnott (V1),1979	100 km/62 mi	221,900 km/137,880 mi	.68
Io	Galileo, 1610	3,630 km/2,256 mi	421,600 km/261,970 mi	1.77
Europa	Galileo, 1610	3,140 km/1,951 mi	670,900 km/416,880 mi	3.55
Ganymede	Galileo, 1610	5,260 km/3,268 mi	1,070,000 km/664,870 mi	7.16
Callisto	Galileo, 1610	4,800 km/2,938 mi	1,883,000km/1,170,000 mi	16.69
Leda	Kowal, 1974	15 km/9 mi	11,094,000 km/6,893,500 mi	238.72
Himalia	Perrine, 1904	185 km/115 mi	11,480,000 km/7,133,300 mi	250.57
Lysithea	Nicholson, 1938	35 km/22 mi	11,720,000 km/7,282,500 mi	259.22
Elara	Perrine, 1905	75 km/47 mi	11,737,000 km/7,293,000 mi	259.70
Ananke	Nicholson, 1951	30 km/19 mi	21,200,000 km/13,173,100 mi	631.00
Carme	Nicholson, 1938	49 km/30 mi	22,600,000 km/14,043,000 mi	692.00
Pasiphae	Melotte, 1908	50 km/31 mi	23,500,000 km/14,602,000 mi	735.00
Sinope	Nicholson, 1914	35 km/22 mi	23,700,000 km/14,726,500 mi	758.00
S/1999 J1	1999**	(?)10-15km/6-9mi	24,000,000 km/15,000,000 mi	~730.00

As many as 17 more satellites of Jupiter have been found and scientists continue to search for more.
**	International Team:	T. Gehrels, A. Gleason, J. Larsen, B. Marsden, R. McMillan, J. Montani, J. Scotti, T. Spahr, G. Williams

Satellite Name	*Discoverer*	*Diameter*	Distance from Saturn	Orbital Period (days)
Pan	Showalter, 1990	20 km/12 mi	134,000 km/83,260 mi	.58
Atlas	Terrile, 1980	30 km/19 mi	137,640 km/85,500 mi	.60
Prometheus	Collins, 1980	100 km/62 mi	139,350 km/86,600 mi	.61
Pandora	Collins, 1980	90 km/56 mi	141,700 km/88,000 mi	.63
Epimetheus	Walker, 1966	120 km/75 mi	151,420 km/94,090 mi	.69
Janus	Dolfus, 1966	190 km/118 mi	151,420 km/94,120 mi	.70
Mimas	Herschel, 1789	390 km/242 mi	185,520 km/115,280 mi	.94
Enceladus	Herschel, 1789	500 km/311 mi	238,020 km/147,900 mi	1.37
Tethys	Cassini, 1684	1,060 km/659 mi	294,660 km/183,000 mi	1.89
Telesto	Smith, 1980	25 km/16 mi	294,660 km/183,000 mi	1.89
Calypso	Smith, 1980	25 km/16 mi	294,660 km/183,000 mi	1.89
Dione	Cassini, 1684	1,120 km/696 mi	377,400 km/234,500 mi	2.74
Helene	Laques/Lecacheux,1980	30 km/19 mi	377,400 km/234,500 mi	2.74
Rhea	Cassini, 1672	1,530 km/951 mi	527,040 km/327,500 mi	4.52
Titan	Huygens, 1655	5,150 km/3,200 mi	1,221,850 km/759,200 mi	15.95
Hyperion	Bond, 1971	255 km/159 mi	1,481,000 km/920,300 mi	21.28
Iapetus	Cassini, 1671	1,460 km/907 mi	3,561,300 km/2,212,900 mi	79.33
Phoebe	Pickering, 1898	220 km/137 mi	12,952,000 km/8,048,000 mi	550.48
S/2000S1	2000**	10-50 km/6-30 mi	>15,000,000 km/9,000,000 mi	?
S/2000S2	2000**	10-50 km/6-30 mi	>15,000,000 km/9,000,000 mi	?
S/2000S3	2000**	10-50 km/6-30 mi	>15,000,000 km/9,000,000 mi	?
S/2000S4	2000**	10-50 km/6-30 mi	>15,000,000 km/9,000,000 mi	?
As many as 8 more satellites of Saturn have been found and scientists continue to search for more.
** International Team: Burns, Gladman, Holman, Kavelaars, Marsden, Nicholson, Petit, Scholl

Satellite Name	*Discoverer*	*Diameter*	Distance from Uranus	Orbital Period (days)
Cordelia	Voyager 2, 1986	25 km/16 mi	49,750 km/30,910 mi	.34
Ophelia	Voyager 2, 1986	25 km/16 mi	53,760 km/33,400 mi	.38
Bianca	Voyager 2, 1986	45 km/28 mi	59,160 km/36,760 mi	.44
Cressida	Voyager 2, 1986	65 km/40 mi	61,770 km/38,400 mi	.46
Desdemona	Voyager 2, 1986	60 km/37 mi	62,660 km/38,940 mi	.47
Juliet	Voyager 2, 1986	85 km/53 mi	64,360 km/40,000 mi	.49
Portia	Voyager 2, 1986	110 km/68 mi	66,100 km/41,070 mi	.51
Rosalind	Voyager 2, 1986	60 km/37 mi	69,930 km/43,500 mi	.56
Belinda	Voyager 2, 1986	68 km/42 mi	75,260 km/46,800 mi	.62
Puck	Voyager 2, 1986	155 km/96 mi	86,010 km/53,440 mi	.76
Miranda	Kuiper, 1948	485 km/301 mi	129,780 km/80,640 mi	1.41
Ariel	Lassell, 1851	1,160 km/721 mi	191,240 km/118,800 mi	2.52
Umbriel	Lassell, 1851	1,190 km/739 mi	265,970 km/165,300 mi	4.14
Titania	Herschel, 1787	1,610 km/1,000 mi	435,840 km/270,800 mi	8.71
Oberon	Herschel, 1787	1,550 km/963 mi	582,600 km/362,000 mi	13.46
1997U1 (Caliban*)	Gladman, Nicholson, Burn, Kavelaars, 1997	approx. 80 km/49.6 mi	7,164,647 km 4,442,081 mi	579.4
1999U1	Gladman, Petie, Scholl, Kavelaars, Holman, 1999	20 km/12.4 mi	10,000,000 km 6,200,000 mi	n/a
1997U2 (Sycorax*)	Gladman, Nicholson, Burn, Kavelaars, 1997	approx. 160 km/99.2 mi	12,174,687 km 7,548,308 mi	1284
1999U2	Gladman, Petie, Scholl, Kavelaars, Holman, 1999	20 km/12.4 mi	25,000,000 km 15,500,000 mi	n/a
1999U3	Gladman, Petie, Scholl, Kavelaars, Holman, 1999	20 km/12.4 mi	10-25,000,000 km 6,200,000-15-500,000 mi	n/a
2001U1	Holman, Kavelaars, Gladman, Petie, 2001	n/a	n/a	n/a
2003U1	Showalter and Lissauer, 2003	16 km/10 mi	97,700 km 60,700 mi	.92
2003U2	Showalter and Lissauer, 2003	12 km/8 mi	74,800 km 46,500 mi	.62
1986U10	Voyager 2, 1986 Karkoschka, 1999	40 km/25 mi	75,000 km 46,600 mi	.62
* Name has been provisionally approved by the IAU.

Satellite Name	*Discoverer*	*Diameter*	Distance from Neptune	Orbital Period (days)
Naiad	Voyager 2, 1989	60 km/37 mi	48,000 km/29,800 mi	.30
Thalassa	Voyager 2, 1989	80 km/50 mi	50,000 km/31,100 mi	.31
Despina	Voyager 2, 1989	150 km/ 93 mi	52,500 km/32,600 mi	.33
Galatea	Voyager 2, 1989	160 km/99 mi	62.000 km/38,500 mi	.43
Larissa	Voyager 2, 1989	190 km/118 mi	73,600 km/45,700 mi	.55
Proteus	Voyager 2, 1989	420 km/261 mi	117,600 km/73,100 mi	1.12
Triton	Lassell, 1846	2,700 km/1,678 mi	354,800 km/220,500 mi	5.88
Nereid	Kuiper, 1949	340 km/211 mi	5,513,400 km/3,426,000 mi	365.21

Satellite Name	*Discoverer*	*Diameter*	Distance from Earth	Orbital Period (days)
Moon	-	3,476 km/2,160 mi	384,400 km/238,860 mi	27.3

Satellite Name	*Discoverer*	*Diameter*	Distance from Mars	Orbital Period (days)
Phobos	A. Hall,1877	21 km/13 mi	9,380 km/5,830 mi	.32
Deimos	A. Hall,1877	12 km/8 mi	23,460 km/14,580 mi	1.26

Satellite Name	*Discoverer*	*Diameter*	Distance from Pluto	Orbital Period (days)
Charon	J. Christy, 1978	1,270 km/789 mi	19,640 km/12,200 mi	6.39