| planet | satellite | radius/semiaxes (see note) | density | distance from planet | orbital period | orbital eccentricity | orbital inclination | year discovered |
|---|---|---|---|---|---|---|---|---|
| km | kg/m3 | km | days | degrees | ||||
| Earth | Moon | 3475 | 3344 | 384,400 | 27.3217 | 0.055 | 5.15 | N/A |
| Mars | Phobos | 27 x 22 x 18 | 1872 | 9,377 | 0.3189 | 0.015 | 1.08 | 1877 |
| Deimos | 15 x 12 x 10 | 1471 | 23,462 | 1.2624 | 0.000 | 1.78 | 1877 | |
| Jupiter | Metis | 60 x 40 x 40 | 128,100 | 0.2948 | 0.001 | 0.02 | 1979 | |
| Adrastea | 20 x 16 x 14 | 128,900 | 0.2983 | 0.002 | 0.05 | 1979 | ||
| Amalthea | 250 x 146 x 128 | 849 | 181,400 | 0.4982 | 0.003 | 0.38 | 1892 | |
| Thebe | 116 x 98 x 84 | 221,900 | 0.6745 | 0.018 | 1.08 | 1979 | ||
| Io | 3659 x 3639 x 3631 | 3528 | 421,800 | 1.7691 | 0.004 | 0.04 | 1610 | |
| Europa | 3128 x 3122 x 3122 | 3013 | 671,100 | 3.5512 | 0.009 | 0.47 | 1610 | |
| Ganymede | 5265 x 5264 x 5265 | 1942 | 1,070,400 | 7.1546 | 0.001 | 0.18 | 1610 | |
| Callisto | 4819 x 4818 x 4819 | 1834 | 1,882,700 | 16.6890 | 0.007 | 0.19 | 1610 | |
| Themisto | 8 | 7,390,000 | 129.8 | 0.444 | 40.22 | 1975 | ||
| Leda | 20 | 11,150,000 | 240.5 | 0.186 | 27.63 | 1974 | ||
| Himalia | 170 | 11,430,000 | 249.6 | 0.182 | 28.14 | 1904 | ||
| Lysithea | 36 | 11,680,000 | 257.9 | 0.134 | 27.41 | 1938 | ||
| Elara | 86 | 11,710,000 | 258.9 | 0.244 | 27.29 | 1905 | ||
| S/2000 J11 | 3 | 12,555,000 | 287.4 | 0.248 | 28.30 | 2000 | ||
| Carpo | 2 | 17,010,000 | 453.2 | 0.602 | 48.08 | 2003 | ||
| S/2003 J12 | 2 | 17,850,000 | 487.2 | 0.598 | 154.40 | 2003 | ||
| Euporie | 2 | 19,250,000 | 545.6 | 0.112 | 144.96 | 2001 | ||
| S/2003 J 3 | 2 | 20,060,000 | 580.4 | 0.314 | 149.26 | 2003 | ||
| S/2003 J18 | 2 | 20,290,000 | 590.4 | 0.187 | 146.68 | 2003 | ||
| S/2003 J16 | 2 | 20,720,000 | 609.3 | 0.334 | 150.29 | 2003 | ||
| Mneme | 2 | 20,820,000 | 613.7 | 0.344 | 150.30 | 2003 | ||
| Euanthe | 3 | 20,850,000 | 615.1 | 0.332 | 150.55 | 2001 | ||
| Harpalyke | 4 | 20,900,000 | 617.3 | 0.336 | 150.43 | 2000 | ||
| Orthosie | 2 | 20,910,000 | 617.7 | 0.439 | 148.62 | 2001 | ||
| Praxidike | 7 | 20,910,000 | 617.7 | 0.330 | 150.57 | 2000 | ||
| Thyone | 4 | 20,930,000 | 618.6 | 0.339 | 149.66 | 2001 | ||
| Helike | 4 | 20,930,000 | 618.6 | 0.292 | 154.80 | 2003 | ||
| Thelxinoe | 2 | 20,940,000 | 619.0 | 0.299 | 152.70 | 2003 | ||
| Iocaste | 5 | 21,080,000 | 625.3 | 0.321 | 150.60 | 2000 | ||
| Ananke | 28 | 21,110,000 | 626.6 | 0.339 | 150.23 | 1951 | ||
| Hermippe | 4 | 21,150,000 | 628.4 | 0.307 | 152.08 | 2001 | ||
| S/2003 J15 | 2 | 22,320,000 | 681.2 | 0.329 | 148.11 | 2003 | ||
| S/2003 J10 | 2 | 22,720,000 | 699.6 | 0.457 | 166.63 | 2003 | ||
| S/2003 J17 | 2 | 22,750,000 | 701.0 | 0.260 | 165.58 | 2003 | ||
| Pasithee | 2 | 22,920,000 | 708.9 | 0.292 | 165.65 | 2001 | ||
| Kallichore | 1 | 22,930,000 | 709.4 | 0.280 | 165.75 | 2003 | ||
| Chaldene | 4 | 22,950,000 | 710.3 | 0.285 | 165.65 | 2000 | ||
| Eurydome | 3 | 22,980,000 | 711.7 | 0.383 | 152.01 | 2001 | ||
| Erinome | 3 | 22,980,000 | 711.7 | 0.294 | 165.77 | 2000 | ||
| Arche | 4 | 23,010,000 | 713.1 | 0.280 | 165.63 | 2002 | ||
| Isonoe | 4 | 23,020,000 | 713.5 | 0.270 | 165.92 | 2000 | ||
| Aitne | 3 | 23,020,000 | 713.5 | 0.293 | 165.70 | 2001 | ||
| Kale | 2 | 23,050,000 | 714.9 | 0.275 | 165.58 | 2001 | ||
| Taygete | 5 | 23,050,000 | 714.9 | 0.277 | 165.71 | 2000 | ||
| S/2003 J 9 | 2 | 23,070,000 | 715.9 | 0.300 | 165.53 | 2003 | ||
| Eukelade | 2 | 23,160,000 | 720.1 | 0.287 | 165.91 | 2003 | ||
| Carme | 46 | 23,220,000 | 722.9 | 0.278 | 165.56 | 1938 | ||
| S/2003 J19 | 3 | 23,280,000 | 725.7 | 0.276 | 165.77 | 2003 | ||
| S/2003 J 5 | 4 | 23,280,000 | 725.7 | 0.289 | 165.96 | 2003 | ||
| Kalyke | 5 | 23,380,000 | 730.3 | 0.289 | 165.92 | 2000 | ||
| Hegemone | 1 | 23,380,000 | 730.3 | 0.429 | 156.92 | 2003 | ||
| Sponde | 2 | 23,470,000 | 734.6 | 0.417 | 152.63 | 2001 | ||
| Pasiphae | 60 | 23,590,000 | 740.2 | 0.506 | 153.19 | 1908 | ||
| S/2003 J 4 | 4 | 23,620,000 | 741.6 | 0.493 | 154.36 | 2003 | ||
| Megaclite | 5 | 23,650,000 | 743.0 | 0.514 | 154.50 | 2000 | ||
| Sinope | 38 | 23,650,000 | 743.0 | 0.280 | 158.92 | 1914 | ||
| Cyllene | 2 | 23,710,000 | 745.9 | 0.523 | 153.40 | 2003 | ||
| Autonoe | 4 | 23,740,000 | 747.3 | 0.400 | 154.50 | 2001 | ||
| Callirrhoe | 9 | 23,740,000 | 747.3 | 0.440 | 150.70 | 1999 | ||
| S/2003 J23 | 2 | 24,055,500 | 762.2 | 0.309 | 149.20 | 2003 | ||
| Aoede | 3 | 24,120,000 | 765.3 | 0.507 | 158.42 | 2003 | ||
| Kore | 2 | 24,180,000 | 768.1 | 0.499 | 148.67 | 2003 | ||
| S/2003 J 2 | 2 | 27,540,000 | 933.7 | 0.455 | 157.76 | 2003 | ||
| Saturn | Pan | 26 | 133,584 | 0.5751 | 0.000 | 0.00 | 1990 | |
| Daphnis | 7 | 136,505 | 0.5941 | 0.000 | 0.00 | 2005 | ||
| Atlas | 37 x 34 x 27 | 384 | 137,670 | 0.6017 | 0.001 | 0.00 | 1980 | |
| Prometheus | 148 x 100 x 68 | 297 | 139,380 | 0.6130 | 0.002 | 0.01 | 1980 | |
| Pandora | 110 x 88 x 62 | 440 | 141,720 | 0.6285 | 0.004 | 0.05 | 1980 | |
| Epimetheus | 138 x 110 x 110 | 601 | 151,410 | 0.6943 | 0.010 | 0.35 | 1977 | |
| Janus | 194 x 190 x 154 | 652 | 151,460 | 0.6947 | 0.007 | 0.16 | 1898 | |
| Mimas | 415 x 394 x 381 | 1150 | 185,540 | 0.9424 | 0.020 | 1.57 | 1789 | |
| Methone | 3 | 194,440 | 1.0096 | 0.000 | 0.01 | 2004 | ||
| Anthe | 1 | 197,700 | 1.0351 | 0.000 | 0.00 | 2007 | ||
| Pallene | 4 | 212,280 | 1.1537 | 0.004 | 0.18 | 2004 | ||
| Enceladus | 513 x 503 x 497 | 1610 | 238,040 | 1.3702 | 0.005 | 0.01 | 1789 | |
| Tethys | 1081 x 1062 x 1055 | 973 | 294,670 | 1.8878 | 0.000 | 1.09 | 1684 | |
| Telesto | 30 x 25 x 15 | 294,710 | 1.8878 | 0.000 | 1.18 | 1980 | ||
| Calypso | 30 x 16 x 16 | 294,710 | 1.8878 | 0.001 | 1.50 | 1980 | ||
| Dione | 1128 x 1122 x 1121 | 1476 | 377,420 | 2.7369 | 0.002 | 0.03 | 1684 | |
| Helene | 32 | 377,420 | 2.7369 | 0.007 | 0.21 | 1980 | ||
| Polydeuces | 4 | 377,200 | 2.7369 | 0.019 | 0.18 | 2004 | ||
| Rhea | 1534 x 1525 x 1526 | 1233 | 527,070 | 4.5175 | 0.001 | 0.33 | 1672 | |
| Titan | 5151 | 1880 | 1,221,870 | 15.9454 | 0.029 | 0.28 | 1655 | |
| Hyperion | 328 x 260 x 214 | 569 | 1,500,880 | 21.2766 | 0.027 | 0.63 | 1848 | |
| Iapetus | 1495 x 1495 x 1425 | 1083 | 3,560,840 | 79.3310 | 0.028 | 7.49 | 1671 | |
| Kiviuq | 16 | 11,310,000 | 449.1 | 0.521 | 42.38 | 2000 | ||
| Ijiraq | 12 | 11,350,000 | 451.4 | 0.534 | 42.63 | 2000 | ||
| Phoebe | 217 x 215 x 203 | 1633 | 12,940,000 | 549.6 | 0.164 | 175.20 | 1898 | |
| Paaliaq | 22 | 15,000,000 | 685.9 | 0.600 | 41.40 | 2000 | ||
| Skathi | 8 | 15,600,000 | 727.4 | 0.329 | 153.85 | 2000 | ||
| Albiorix | 32 | 16,350,000 | 780.5 | 0.577 | 31.77 | 2000 | ||
| S/2007 S 2 | 6 | 16,560,000 | 795.6 | 0.218 | 176.70 | 2007 | ||
| Bebhionn | 6 | 16,960,000 | 824.6 | 0.576 | 32.83 | 2004 | ||
| Erriapo | 10 | 17,550,000 | 868.0 | 0.575 | 32.47 | 2000 | ||
| Skoll | 6 | 17,665,000 | 876.6 | 0.464 | 161.20 | 2006 | ||
| Siarnaq | 40 | 17,920,000 | 895.6 | 0.495 | 43.14 | 2000 | ||
| Tarqeq | 7 | 17,920,000 | 895.6 | 0.107 | 49.86 | 2007 | ||
| Greip | 6 | 18,105,000 | 909.5 | 0.374 | 172.70 | 2006 | ||
| Tarvos | 15 | 18,220,000 | 918.2 | 0.636 | 31.35 | 2000 | ||
| S/2004 S13 | 6 | 18,430,000 | 934.1 | 0.269 | 169.57 | 2004 | ||
| Hyrokkin | 8 | 18,437,000 | 934.7 | 0.333 | 151.40 | 2004 | ||
| Mundilfari | 7 | 18,580,000 | 945.5 | 0.221 | 167.58 | 2000 | ||
| Jarnsaxa | 6 | 18,600,000 | 947.1 | 0.192 | 162.90 | 2006 | ||
| S/2004 S17 | 4 | 18,770,000 | 960.1 | 0.229 | 168.15 | 2004 | ||
| Bergelmir | 6 | 18,850,000 | 966.2 | 0.203 | 159.05 | 2004 | ||
| S/2006 S 1 | 6 | 18,981,000 | 976.3 | 0.130 | 154.20 | 2006 | ||
| Narvi | 7 | 19,270,000 | 998.7 | 0.594 | 150.39 | 2003 | ||
| Suttungr | 7 | 19,360,000 | 1,005.7 | 0.121 | 176.03 | 2000 | ||
| Aegir | 6 | 19,370,000 | 1,006.5 | 0.281 | 166.63 | 2004 | ||
| S/2004 S12 | 5 | 19,570,000 | 1,022.1 | 0.354 | 166.16 | 2004 | ||
| Farbauti | 5 | 19,820,000 | 1,041.8 | 0.310 | 158.00 | 2004 | ||
| Bestla | 7 | 19,880,000 | 1,046.5 | 0.730 | 149.64 | 2004 | ||
| S/2004 S 7 | 6 | 19,970,000 | 1,053.6 | 0.571 | 167.34 | 2004 | ||
| Hati | 6 | 20,030,000 | 1,058.4 | 0.375 | 166.71 | 2004 | ||
| Thrymr | 7 | 20,290,000 | 1,079.0 | 0.475 | 176.43 | 2000 | ||
| S/2007 S 3 | 5 | 20,518,000 | 1,097.3 | 0.130 | 177.20 | 2007 | ||
| S/2006 S 3 | 6 | 21,132,000 | 1,146.9 | 0.471 | 150.80 | 2006 | ||
| Kari | 7 | 22,118,000 | 1,228.1 | 0.478 | 156.30 | 2006 | ||
| Fenrir | 4 | 22,500,000 | 1,260.1 | 0.173 | 165.01 | 2004 | ||
| Fornjot | 6 | 22,620,000 | 1,270.1 | 0.231 | 170.71 | 2004 | ||
| Surtur | 6 | 22,707,000 | 1,277.5 | 0.451 | 177.50 | 2006 | ||
| Loge | 6 | 23,065,000 | 1,307.8 | 0.187 | 167.90 | 2006 | ||
| Ymir | 18 | 23,130,000 | 1,313.3 | 0.347 | 173.88 | 2000 | ||
| Uranus | Cordelia | 40 | 49,800 | 0.3350 | 0.000 | 0.09 | 1986 | |
| Ophelia | 43 | 53,800 | 0.3764 | 0.010 | 0.10 | 1986 | ||
| Bianca | 51 | 59,200 | 0.4346 | 0.001 | 0.19 | 1986 | ||
| Cressida | 80 | 61,800 | 0.4636 | 0.000 | 0.01 | 1986 | ||
| Desdemona | 64 | 62,700 | 0.4736 | 0.000 | 0.11 | 1986 | ||
| Juliet | 94 | 64,400 | 0.4931 | 0.001 | 0.07 | 1986 | ||
| Portia | 135 | 66,100 | 0.5132 | 0.000 | 0.06 | 1986 | ||
| Rosalind | 72 | 69,900 | 0.5585 | 0.000 | 0.28 | 1986 | ||
| Cupid | 10 | 74,392 | 0.6128 | 0.001 | 0.10 | 2003 | ||
| Belinda | 81 | 75,300 | 0.6235 | 0.000 | 0.03 | 1986 | ||
| Perdita | 20 | 76,417 | 0.6380 | 0.012 | 0.47 | 1986 | ||
| Puck | 162 | 86,000 | 0.7618 | 0.000 | 0.32 | 1985 | ||
| Mab | 10 | 97,736 | 0.9230 | 0.003 | 0.13 | 2003 | ||
| Miranda | 481 x 468 x 466 | 1201 | 129,900 | 1.4135 | 0.001 | 4.34 | 1948 | |
| Ariel | 1162 x 1156 x 1156 | 1665 | 190,900 | 2.5204 | 0.001 | 0.04 | 1851 | |
| Umbriel | 1169 | 1400 | 266,000 | 4.1442 | 0.004 | 0.13 | 1851 | |
| Titania | 1578 | 1715 | 436,300 | 8.7059 | 0.001 | 0.08 | 1787 | |
| Oberon | 1523 | 1630 | 583,500 | 13.4632 | 0.001 | 0.07 | 1787 | |
| Francisco | 12 | 4,280,000 | 267.5 | 0.184 | 147.47 | 2001 | ||
| Caliban | 98 | 7,170,000 | 579.9 | 0.304 | 143.09 | 1997 | ||
| Stephano | 20 | 7,960,000 | 678.4 | 0.325 | 145.48 | 1999 | ||
| Trinculo | 10 | 8,510,000 | 749.9 | 0.228 | 167.39 | 2001 | ||
| Sycorax | 190 | 12,190,000 | 1,285.6 | 0.564 | 161.64 | 1997 | ||
| Margaret | 11 | 14,450,000 | 1,659.2 | 0.849 | 48.66 | 2003 | ||
| Prospero | 30 | 16,200,000 | 1,969.5 | 0.534 | 155.02 | 1999 | ||
| Setebos | 30 | 17,520,000 | 2,215.1 | 0.642 | 160.99 | 1999 | ||
| Ferdinand | 12 | 20,320,000 | 2,766.8 | 0.414 | 170.75 | 2001 | ||
| Neptune | Naiad | 66 | 48,227 | 0.2944 | 0.000 | 4.75 | 1989 | |
| Thalassa | 82 | 50,075 | 0.3115 | 0.000 | 0.21 | 1989 | ||
| Despina | 150 | 52,526 | 0.3347 | 0.000 | 0.06 | 1989 | ||
| Galatea | 176 | 61,953 | 0.4287 | 0.000 | 0.06 | 1989 | ||
| Larissa | 208 x 178 | 73,548 | 0.5547 | 0.001 | 0.21 | 1989 | ||
| Proteus | 436 x 416 x 402 | 117,647 | 1.1223 | 0.001 | 0.03 | 1989 | ||
| Triton | 2707 | 2061 | 354,800 | 5.8766 | 0.000 | 156.80 | 1846 | |
| Nereid | 340 | 5,520,000 | 360.6 | 0.750 | 6.50 | 1949 | ||
| Halimede | 62 | 16,640,000 | 1,887.5 | 0.885 | 142.10 | 2002 | ||
| Sao | 44 | 22,260,000 | 2,920.4 | 0.593 | 42.13 | 2002 | ||
| Laomedeia | 42 | 23,380,000 | 3,143.5 | 0.518 | 32.63 | 2002 | ||
| Psamathe | 40 | 47,380,000 | 9,068.6 | 0.780 | 146.12 | 2003 | ||
| Neso | 60 | 49,910,000 | 9,804.6 | 0.768 | 143.06 | 2002 | ||
| Pluto | Charon | 1212 | 1630 | 19,571 | 6.3872 | 0.000 | 0.00 | 1978 |
| Nix | 90 | 48,680 | 24.8562 | 0.002 | 0.10 | 2005 | ||
| Hydra | 110 | 64,780 | 38.2065 | 0.005 | 0.25 | 2005 | ||
| Eris | Dysnomia | 400 | 37,400 | 15.7720 | 0.01 | ? | 2005 |
Note: for satellites with measurably non-spherical shapes, "radius" column gives semiaxes of the best fit triaxial ellipsoid.
© 2001-2005, 2007 by Wm. Robert Johnston.
Last modified 21 November 2007.
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