List of the 97 satellites of the Solar System
This moon list was last updated April
16, 2001 . This list includes both planetary satellites
and asteroidal companions. Note that because some were only recently discovered,
some have missing information.
For your information: 26 moons were discovered in 2000, breaking the
record for the most moons discovered in one year, beating out 1986, when
Voyager 2 discovered 9 moons of Uranus. 12 Saturnian moons have been discovered;
11 Jovian moon has been discovered with one more found to be a moon, not
an asteroid (but was discovered in 1999); 1 moon of Pulcova was discovered;
1 moon of 2000 DP107 was discovered. Finally, the first moon of a TNO was
discovered. Two so far have been discovered in 2001, both moons of asteroids.
| Planet/Moon |
Orbital Period |
Semi-Major Axis |
Diameter |
e |
i |
Year of Discovery |
Discoverer |
| Mercury |
|
|
|
|
|
|
|
| None |
|
|
|
|
|
|
|
| Venus |
|
|
|
|
|
|
|
| None |
|
|
|
|
|
|
|
| Earth |
|
|
|
|
|
|
|
| Moon |
27.3 days |
384000 km |
3476 km |
0.0549 |
18-29 |
---
|
---
|
| Mars |
|
|
|
|
|
|
|
| Phobos |
7.7 hours |
9400 km |
27x21x19 km |
0.0151 |
1.08 |
1877 |
Hall |
| Deimos |
30.3 hours |
23500 km |
15x12x11 km |
0.0003 |
1.79 |
1877 |
Hall |
| 243 Ida |
|
|
|
|
|
|
|
| Dactyl |
|
90 km |
1.2x1.4x1.6 km |
|
|
1993 |
Galileo |
| 762 Pulcova |
|
|
|
|
|
|
|
| S/ 2000 (762) 1 |
4 days |
800 km |
9 km |
|
|
2000 |
Merline |
| 45 Eugenia |
|
|
|
|
|
|
|
| Petit-Prince |
4.7 days |
1190 km |
13 km |
|
|
1998 |
Merline |
| 87 Sylvia |
|
|
|
|
|
|
|
| S/ 2001 (87) 1 |
4 days |
1200 km |
|
|
|
2001 |
Brown |
| 107 Camilla |
|
|
|
|
|
|
|
| S/ 2001 (107) 1 |
|
|
|
|
|
2001 |
Storrs |
| Jupiter |
|
|
|
|
|
|
|
| Metis |
7.1 hours |
128000 km |
40 km |
0.0 |
0.0 |
1979 |
Synnott |
| Adrastea |
7.1 hours |
129000 km |
25x20x15 km |
0.0 |
0.0 |
1979 |
Jewitt |
| Amalthea |
12 hours |
181300 km |
262x146x134 km |
0.003 |
0.45 |
1892 |
Barnard |
| Thebe |
16.2 hours |
221900 km |
110x90 km |
0.015 |
0.8 |
1979 |
Synnott |
| Io |
1.76 days |
421600 km |
3630 km |
0.004 |
0.04 |
1610 |
Galileo |
| Europa |
3.55 days |
670900 km |
3130 km |
0.010 |
0.47 |
1610 |
Galileo |
| Ganymede |
7.2 days |
1071000 km |
5280 km |
0.002 |
0.21 |
1610 |
Galileo |
| Callisto |
16.8 days |
1883000 km |
4840 km |
0.007 |
0.51 |
1610 |
Galileo |
| S/ 1975 J 1 |
130 days |
7398200 km |
8 km |
0.206 |
45.37 |
1975 |
Kowal |
| Leda |
240 days |
11094000 km |
10 km |
0.148 |
26.70 |
1974 |
Kowal |
| Himalia |
251 days |
11480000 km |
170 km |
0.163 |
27.63 |
1904 |
Perrine |
| Lysithea |
260 days |
11720000 km |
24 km |
0.107 |
29.02 |
1938 |
Nicholson |
| Elara |
260.1 days |
11737000 km |
80 km |
0.207 |
24.77 |
1904 |
Perrine |
| S/ 2000 J 11 |
289.7 days |
12623200 km |
4 km |
0.215 |
28.5 |
2000 |
Sheppard |
| S/ 2000 J 10 |
r 590.9 days |
20299700 km |
3.8 km |
0.155 |
165.6 |
2000 |
Sheppard |
| S/ 2000 J 3 |
r 605.9 days |
20643200 km |
5.2 km |
0.269 |
150 |
2000 |
Sheppard |
| S/ 2000 J 5 |
r 618.1 days |
20918000 km |
4.3 km |
0.200 |
149.3 |
2000 |
Sheppard |
| S/ 2000 J 7 |
r 626.1 days |
21098400 km |
6.8 km |
0.146 |
146 |
2000 |
Sheppard |
| Ananke |
r 631 days |
21200000 km |
20 km |
0.169 |
147 |
1951 |
Nicholson |
| S/ 2000 J 9 |
r 651.8 days |
21672200 km |
5 km |
0.246 |
163.5 |
2000 |
Sheppard |
| S/ 2000 J 4 |
r 660.6 days |
21868100 km |
3.2 km |
0.346 |
161 |
2000 |
Sheppard |
| Carme |
r 692 days |
22600000 km |
30 km |
0.207 |
163 |
1938 |
Nicholson |
| S/ 2000 J 6 |
r 703.6 days |
22805000 km |
3.8 km |
0.281 |
165 |
2000 |
Sheppard |
| S/ 2000 J 8 |
r 733.1 days |
23439400 km |
5.4 km |
0.528 |
151.7 |
2000 |
Sheppard |
| Pasiphae |
r 735 days |
23500000 km |
36 km |
0.378 |
145 |
1908 |
Melotte |
| S/ 1999 J 1 |
r 736 days |
23500000 km |
10 km |
0.206 |
143.5 |
1999 |
Spacewatch |
| Sinope |
r 758 days |
23700000 km |
28 km |
0.275 |
153 |
1914 |
Nicholson |
| S/ 2000 J 2 |
r 766 days |
24136000 km |
5.2 km |
0.317 |
165.8 |
2000 |
Sheppard |
| Saturn |
|
|
|
|
|
|
|
| Pan |
13.8 hours |
133600 km |
9.655 km |
0.0 |
0.0 |
1980 |
Showalter |
| Atlas |
14.4 hours |
137600 km |
38x34x28 km |
0.0 |
0.0 |
1980 |
Terrile |
| Prometheus |
14.7 hours |
139300 km |
148x100x68 km |
0.002 |
0.0 |
1980 |
Collins |
| Pandora |
15 hours |
141700 km |
110x88x62 km |
0.004 |
0.05 |
1980 |
Collins |
| Epimetheus |
16.7 hours |
151400 km |
138x110x110 km |
0.009 |
0.14 |
1979 |
Walker |
| Janus |
16.7 hours |
151500 km |
194x190x154 km |
0.007 |
0.34 |
1966 |
Dolfus |
| Mimas |
22.6 hours |
185500 km |
398 km |
0.020 |
1.53 |
1789 |
Herschel |
| Enceladus |
1.4 days |
238000 km |
498 km |
0.004 |
0.0 |
1789 |
Herschel |
| Tethys |
1.9 days |
294700 km |
1060 km |
0.000 |
1.0 |
1684 |
Cassini |
| Telesto |
1.9 days |
294700 km |
30x24x16 km |
0.0 |
1.0 |
1980 |
Pascu |
| Calypso |
1.9 days |
294700 km |
30x16x16 km |
0.0 |
1.10 |
1980 |
Reitsema |
| Dione |
2.7 days |
377400 km |
1120 km |
0.002 |
0.02 |
1684 |
Cassini |
| Helene |
2.7 days |
377400 km |
36x32x30 km |
0.005 |
0.15 |
1980 |
Lecacheux |
| Rhea |
4.5 days |
527000 km |
1528 km |
0.001 |
0.35 |
1672 |
Cassini |
| Titan |
15.9 days |
1222000 km |
5150 km |
0.029 |
0.33 |
1655 |
Huygens |
| Hyperion |
21.3 days |
1481000 km |
360x280x224 km |
0.104 |
0.4 |
1848 |
Bond |
| Iapetus |
79.3 days |
3561000 km |
1436 km |
0.028 |
14.72 |
1671 |
Cassini |
| S/ 2000 S 5 |
448 days |
11291700 km |
16 km |
0.158 |
48.5 |
2000 |
Gladman |
| S/ 2000 S 6 |
451.8 days |
11355400 km |
13 km |
0.367 |
49.3 |
2000 |
Gladman |
| Phoebe |
r 550 days |
12952000 km |
220 km |
0.163 |
150 |
1898 |
Pickering |
| S/ 2000 S 2 |
690.25 days |
15063600 km |
24 km |
0.459 |
46.2 |
2000 |
Gladman |
| S/ 2000 S 8 |
r 730.5 days |
15361100 km |
8.5 km |
0.214 |
148.6 |
2000 |
Gladman |
| S/ 2000 S 3 |
791 days |
16496000 km |
48 km |
0.293 |
48.6 |
2000 |
Gladman |
| S/ 2000 S 11 |
881.9 days |
17736800 km |
32 km |
0.387 |
34.9 |
2000 |
Holman |
| S/ 2000 S 12 |
r 888 days |
17817900 km |
8 km |
0.0866 |
174.8 |
2000 |
Gladman |
| S/ 2000 S 4 |
889.5 days |
17839300 km |
16 km |
0.635 |
35 |
2000 |
Gladman |
| S/ 2000 S 10 |
926.8 days |
18334200 km |
10 km |
0.614 |
33.3 |
2000 |
Gladman |
| S/ 2000 S 9 |
r 943.3 days |
18551200 km |
12 km |
0.254 |
169.6 |
2000 |
Gladman |
| S/ 2000 S 7 |
r 1036 days |
19751600 km |
8.3 km |
0.544 |
175 |
2000 |
Gladman |
| S/ 2000 S 1 |
r 1288 days |
22832400 km |
25 km |
0.367 |
172.8 |
2000 |
Gladman |
| Uranus |
|
|
|
|
|
|
|
| Cordelia |
8 hours |
49750 km |
50x36 km |
0.000 |
0.14 |
1986 |
Voyager 2 |
| Ophelia |
9 hours |
53760 km |
54x38 km |
0.010 |
0.09 |
1986 |
Voyager 2 |
| Bianca |
10.2 hours |
59160 km |
64x46 km |
0.001 |
0.16 |
1986 |
Voyager 2 |
| Cressida |
11.1 hours |
61780 km |
92x74 km |
0.000 |
0.04 |
1986 |
Voyager 2 |
| Desdemona |
11.4 hours |
62660 km |
90x54 km |
0.000 |
0.16 |
1986 |
Voyager 2 |
| Juliet |
11.8 hours |
64360 km |
150x74 km |
0.001 |
0.06 |
1986 |
Voyager 2 |
| Portia |
12.3 hours |
66100 km |
156x126 km |
0.000 |
0.09 |
1986 |
Voyager 2 |
| Rosalind |
13.4 hours |
69930 km |
72 km |
0.000 |
0.28 |
1986 |
Voyager 2 |
| Belinda |
15 hours |
75260 km |
128x64 km |
0.000 |
0.03 |
1986 |
Voyager 2 |
| S/ 1986 U 10 |
15.35 hours |
76420 km |
30 km |
0.001 |
0.00 |
1986 |
Karkoschka |
| Puck |
18.3 hours |
86000 km |
162 km |
0.000 |
0.31 |
1985 |
Voyager 2 |
| Miranda |
1.4 days |
129800 km |
470 km |
0.003 |
3.40 |
1948 |
Kuiper |
| Ariel |
2.5 days |
191200 km |
1160 km |
0.003 |
0.0 |
1851 |
Lassell |
| Umbriel |
4.1 days |
266000 km |
1170 km |
0.005 |
0.0 |
1851 |
Lassell |
| Titania |
8.7 days |
435800 km |
1580 km |
0.002 |
0.0 |
1787 |
Herschel |
| Oberon |
13.5 days |
582600 km |
1520 km |
0.001 |
0.0 |
1787 |
Herschel |
| Caliban |
r 579 days |
7169000 km |
60 km |
0.082 |
140 |
1997 |
Gladman |
| Stephano |
r 675 days |
7943000 km |
30 km |
0.146 |
141.5 |
1999 |
Gladman |
| Sycorax |
r 3.5 years |
12214000 km |
120 km |
0.509 |
153 |
1997 |
Nicholson |
| Prospero |
r 5.346 years |
16114000 km |
40 km |
0.327 |
146.3 |
1999 |
Holman |
| Setebos |
r 6.42 years |
18205000 km |
40 km |
0.494 |
148.8 |
1999 |
Kavelaars |
| Neptune |
|
|
|
|
|
|
|
| Naiad |
7.1 hours |
48000 km |
58 km |
0.000 |
0.0 |
1989 |
Voyager 2 |
| Thalassa |
7.5 hours |
50000 km |
80 km |
0.000 |
4.5 |
1989 |
Voyager 2 |
| Despina |
8 hours |
52500 km |
148 km |
0.000 |
0.0 |
1989 |
Voyager 2 |
| Galatea |
10.3 hours |
62000 km |
158 km |
0.000 |
0.0 |
1989 |
Voyager 2 |
| Larissa |
13.3 hours |
73600 km |
208x178 km |
0.000 |
0.0 |
1989 |
Voyager 2 |
| Proteus |
1.1 days |
118000 km |
416 km |
0.000 |
0.0 |
1989 |
Voyager 2 |
| Triton |
r 5.9 days |
355000 km |
2706 km |
0.000 |
157 |
1846 |
Lassell |
| Nereid |
360 days |
5567000 km |
340 km |
0.509 |
29 |
1949 |
Kuiper |
| Pluto |
|
|
|
|
|
|
|
| Charon |
r 6.4 days |
19636 km |
1230 km |
0.0076 |
96.16 |
1977 |
Christy |
| 1998 WW31 |
|
|
|
|
|
|
|
| S/ 2000 (1998 WW31) 1 |
|
~40000 km |
|
|
|
2000 |
Veillet |
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