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Moons
Moons in our Solar System
As of April 2005, there are 137 known natural moons orbiting planets in our Solar System.
| year discovered | discoverer | distance from planet (km) | diameter (km) | orbital period (days) | |
|---|---|---|---|---|---|
| Mercury - 0 Moons | |||||
| Venus - 0 Moons | |||||
| Earth - 2 Moons | |||||
| Moon (or Luna) | ? | ? | 384,400 | 3476 | 27.322 |
| Mars - 2 Moons | |||||
| Deimos | 1877 | A. Hall | 23,460 | 8 | 1.263 |
| Phobos | 1877 | A. Hall | 9,270 | 28 X 20 | 0.319 |
| Jupiter - 60 Moons | |||||
| year discovered | discoverer | distance from planet (km) | diameter (km) | orbital period (days) | |
|---|---|---|---|---|---|
| Adrastea | 1979 | Jewitt & Danielson | 128,980 | 26 X 16 | 0.298 |
| Amalthea | 1892 | E. Barnard | 181,300 | 262 X 134 | 0.498 |
| Ananke | 1951 | S. Nicholson | 21,200,000 | 20 | 631 |
| Callisto | 1610 | Galileo | 1,883,000 | 4,800 | 16.689 |
| Carme | 1938 | S. Nicholson | 22,600,000 | 30 | 692 |
| Callirrhoe | 2000 | Spacewatch Project Minor Planet Center | 24,200,000 | 10 | 774 |
| Chaldene | 2000 | S. Sheppard, D. Jewitt, Y. Fernandez, & G. Magnier | 23,179,000 | 3.8 | 741 |
| Elara | 1905 | C. Perrine | 11,737,000 | 80 | 259.65 |
| Erinome | 2000 | S. Sheppard, D. Jewitt, Y. Fernandez, & G. Magnier | 23,279,000 | 3.2 | 672 |
| Europa | 1610 | Galileo | 670,900 | 3126 | 3.551 |
| Ganymede | 1610 | Galileo | 1,070,000 | 5276 | 7.155 |
| Harpalyke | 2000 | S. Sheppard, D. Jewitt, Y. Fernandez, & G. Magnier | 21,105,000 | 4.3 | 595 |
| Himalia | 1904 | C. Perrine | 11,480,000 | 170 | 250.57 |
| Io | 1610 | Galileo | 421,600 | 3,629 | 1.769 |
| Iocaste | 2000 | S. Sheppard, D. Jewitt, Y. Fernandez, & G. Magnier | 21,269,000 | 5.2 | 657 |
| Isonone | 2000 | S. Sheppard, D. Jewitt, Y. Fernandez, & G. Magnier | 23,217,000 | 3.8 | 712 |
| Kalyke | 2000 | S. Sheppard, D. Jewitt, Y. Fernandez, & G. Magnier | 23,583,000 | 5.2 | 760 |
| Leda | 1974 | C. Kowal | 11,094,000 | 10 | 238.72 |
| Lysithea | 1938 | S. Nicholson | 11,720,000 | 24 | 259.22 |
| Magaclite | 2000 | S. Sheppard, D. Jewitt, Y. Fernandez, & G. Magnier | 23,806,000 | 5.4 | 771 |
| Metis | 1979 | S. Sunnott | 127,960 | 40 | 0.295 |
| Pasiphae | 1908 | P. Melotte | 23,500,000 | 36 | 735 |
| Praxidike | 2000 | S. Sheppard, D. Jewitt, Y. Fernandez, & G. Magnier | 21,147,000 | 6.8 | 632 |
| S/2000 J11 | 2000 | S. Sheppard, D. Jewitt, Y. Fernandez, & G. Magnier | 12,555,000 | 4.0 | 284.3 |
| S/2001 J1 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 24,122,000 | 4 | 753 |
| S/2001 J2 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 21,312,000 | 4 | 615 |
| S/2001 J3 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 21,252,000 | 4 | 630 |
| S/2001 J4 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 23,219,000 | 3 | 713 |
| S/2001 J5 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 23,808,000 | 2 | 732 |
| S/2001 J6 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 23,029,000 | 2 | 715 |
| S/2001 J7 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 21,017,000 | 3 | 622 |
| S/2001 J8 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 23,124,000 | 2 | 609 |
| S/2001 J9 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 21,168,000 | 2 | 617 |
| S/2001 J10 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 19,394,000 | 2 | 534 |
| S/2001 J11 | 2001 | S. Sheppard, D. Jewitt, & J. Kleyna | 23,547,000 | 3 | 736 |
| S/2002 J1 | 2002 | S. Sheppard | 23,064,000 | 3 | 715.6 |
| S/2003 J1 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 24,557,295 | 4 | 237.0 |
| S/2003 J2 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 28,570,410 | 2 | 982.5 |
| S/2003 J3 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 18,339,885 | 2 | 504.0 |
| S/2003 J4 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 23,257,920 | 2 | 723.2 |
| S/2003 J5 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 24,084,180 | 4 | 759.7 |
| S/2003 J6 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 10,972,830 | 4 | 233.8 |
| S/2003 J7 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 23,807,655 | 4 | 748.8 |
| S/2003 J8 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 24,514,095 | 3 | 781.6 |
| S/2003 J9 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 22,441,680 | 1 | 683.0 |
| S/2003 J10 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 24,249,600 | 2 | 767.0 |
| S/2003 J11 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 22,395,390 | 2 | 683.0 |
| S/2003 J12 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 19,002,480 | 1 | 533.3 |
| S/2003 J13 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 24,000,000 | 2 | 737.8 |
| S/2003 J14 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 25,000,000 | 2 | 807.8 |
| S/2003 J15 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 22,000,000 | 2 | 668.4 |
| S/2003 J16 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 21,000,000 | 2 | 595.4 |
| S/2003 J17 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 22,000,000 | 2 | 690.3 |
| S/2003 J18 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 20,700,000 | 2 | 606.3 |
| S/2003 J19 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 22,800,000 | 2 | 701.3 |
| S/2003 J20 | 2003 | S. Sheppard, D. Jewitt, & J. Kleyna | 17,100,000 | 3 | 456.5 |
| Sinope | 1914 | S. Nicholson | 23,700,700 | 28 | 758 |
| Taygete | 2000 | S. Sheppard, D. Jewitt, Y. Fernandez, & G. Magnier | 23,360,000 | 5.0 | 687 |
| Thebe | 1979 | S. Synnott | 221,900 | 100 | 0.675 |
| Themisto | 1975 | C. Kowal & E. Roemer | 7,507,000 | 8 | 130.07 |
| Saturn - 31 Moons | |||||
| year discovered | discoverer | distance from planet (km) | diameter (km) | orbital period (days) | |
|---|---|---|---|---|---|
| Atlas | 1980 | R. Terrile | 137,640 | 37 X 27 | 0.602 |
| Calypso | 1980 | B. Smith | 294,660 | 30 X 16 | 1.888 |
| Dione | 1684 | G. Cassini | 377,400 | 1120 | 2.737 |
| Enceladus | 1789 | W. Herschel | 238,020 | 498 | 1.370 |
| Epimetheus | 1966 | R. Walker | 151,422 | 138 X 110 | 0.694 |
| Helene | 1980 | Laques & Lecacheux | 377,400 | 36 X 28 | 2.737 |
| Hyperion | 1848 | W. Bond | 1,481,000 | 360 X 226 | 21.277 |
| Iapetus | 1671 | G. Cassini | 3,561,300 | 1436 | 14.72 |
| Janus | 1966 | A. Dollfus | 151,472 | 190 X 154 | 0.695 |
| Mimas | 1789 | W. Herschel | 185,520 | 398 | 0.942 |
| Pan | 1990 | M. Showalter | 133,630 | 19.32 | 0.5750 |
| Pandora | 1980 | S. Collins | 141,700 | 110 X 62 | 0.629 |
| Phoebe | 1898 | W. Pickering | 12,952,000 | 220 | 550.48 |
| Prometheus | 1980 | S. Collins | 139,350 | 148 X 68 | 0.613 |
| Rhea | 1672 | G. Cassini | 527,040 | 1528 | 4.518 |
| S/2000 S1 | 2000 | Intl. Team of 8 Astronomers | 23,096,000 | 20 | 1312.37 |
| S/2000 S2 | 2000 | Intl. Team of 8 Astronomers | 15,199,000 | 25 | 686.92 |
| S/2000 S3 | 2000 | Intl. Team of 8 Astronomers | 18,160,000 | 45 | 893.07 |
| S/2000 S4 | 2000 | Intl. Team of 8 Astronomers | 18,239,000 | 16 | 925.70 |
| S/2000 S5 | 2000 | Intl. Team of 8 Astronomers | 11,365,000 | 17 | 449.22 |
| S/2000 S6 | 2000 | Intl. Team of 8 Astronomers | 11,440,000 | 14 | 451.48 |
| S/2000 S7 | 2000 | Intl. Team of 8 Astronomers | 20,470,000 | 7 | 1088.89 |
| S/2000 S8 | 2000 | Intl. Team of 8 Astronomers | 15,645,000 | 8 | 728.93 |
| S/2000 S9 | 2000 | Intl. Team of 8 Astronomers | 18,709,000 | 7 | 951.38 |
| S/2000 S10 | 2000 | Intl. Team of 8 Astronomers | 17,611,000 | 10 | 871.17 |
| S/2000 S11 | 2000 | Gladman et al. | 16,392,000 | 30km | 783 |
| S/2000 S12 | 2000 | Gladman et al. | 19,470,000 | 7 km | 1016.8 |
| S/2003 S1 | 2003 | Scott S. Sheppard, David Jewitt, and Jan Kleyna | 18,719,000 | 8 | 956.2 |
| Telesto | 1980 | B. Smith | 294,660 | 30 X 16 | 1.888 |
| Tethys | 1684 | G. Cassini | 294,660 | 1060 | 1.888 |
| Titan | 1655 | C. Huygens | 1,221,850 | 5150 | 15.945 |
| Uranus - 27 Moons | |||||
| year discovered | discoverer | distance from planet (km) | diameter (km) | orbital period (days) | |
|---|---|---|---|---|---|
| Ariel | 1851 | W. Lassell | 191,240 | 1160 | 2.520 |
| Belinda | 1986 | Voyager 2 | 75,260 | 66 | 0.624 |
| Bianca | 1986 | Voyager 2 | 75,260 | 42 | 0.433 |
| Caliban | 1997 | Gladman, Nicholson, Burns, & Kavelaars | 7,200,000 | 80 | 579.5 |
| Cordelia | 1986 | Voyager 2 | 49,750 | 26 | 0.335 |
| Cressida | 1986 | Voyager 2 | 61,770 | 62 | 0.464 |
| Desdemona | 1986 | Voyager 2 | 62,660 | 54 | 0.474 |
| Juliet | 1986 | Voyager 2 | 64,360 | 84 | 0.493 |
| Miranda | 1948 | G. Kuiper | 129,780 | 472 | 1.414 |
| Oberon | 1787 | W. Herschel | 582,600 | 1526 | 13.463 |
| Ophelia | 1986 | Voyager 2 | 53,440 | 30.4 | 0.3764 |
| Portia | 1986 | Voyager 2 | 66,085 | 108 | 0.513 |
| Prospero | 1999 | Kavelaars, Gladman, Holman et al | 10-25 million | 30 | 5.346 |
| Puck | 1985 | Voyager 2 | 86,010 | 154 | 0.762 |
| Rosalind | 1986 | Voyager 2 | 69,941 | 54 | 0.558 |
| Setebos | 1999 | Kavelaars, Gladman, Holman et al | 10-25 million | 30 | 6.42 |
| Stephano | 1999 | Kavelaars, Gladman, Holman et al | 10-25 million | 20 | 1.85 |
| Sycorax | 1997 | Gladman, Nicholson, Burns, & Kavelaars | 12,200,000 | 160 | 1283.39 |
| S/1986 U10 | 1986 | E. Karkoschka/Voyager 2 | 76,420 | 20 | 0.638 |
| S/2001 U2 | 2001 | M. Holman & B. Gladman et al | 20,901,000 | 12 | 2,887.21 |
| S/2001 U3 | 2001 | M. Holman & B. Gladman et al | 4,281,000 | 12 | 266.6 |
| S/2003 U1 | 2003 | M. Showalter & J. Lissauer | 97,734 | 16 | 0.923 |
| S/2003 U2 | 2003 | M. Showalter & J. Lissauer | 74,800 | 12 | 0.618 |
| S/2003 U3 | 2003 | S. Sheppard | 14,688,700 | 11 | 1,694.8 |
| Titania | 1787 | W. Herschel | 435,840 | 1580 | 8.706 |
| Trinculo | 2001 | M. Holman, J. Kavelaars & D. Milisavljevic | 8,578,000 | 10 | 759.0 |
| Umbriel | 1851 | W. Lassel | 265,970 | 1190 | 4.144 |
| Neptune - 13 Moons | |||||
| year discovered | discoverer | distance from planet (km) | diameter (km) | orbital period (days) | |
|---|---|---|---|---|---|
| Despina | 1989 | Voyager 2 | 62,000 | 160 | 0.40 |
| Galatea | 1989 | Voyager 2 | 52,500 | 140 | 0.33 |
| Larissa | 1989 | Voyager 2 | 73,600 | 200 | 0.56 |
| Naiad | 1989 | Voyager 2 | 48,200 | 50 | 0.30 |
| Nereid | 1949 | G. Kuiper | 5,513,400 | 340 | 360.16 |
| Proteus | 1989 | Voyager 2 | 117,600 | 420 | 1.12 |
| S/2002 N1 | 2002 | M. Holman & J.J. Kavelaars | 15,686,000 | 60 | 1,874.83 |
| S/2002 N2 | 2002 | M. Holman & J.J. Kavelaars | 22,337,190 | 38 | 2,925.6 |
| S/2002 N3 | 2002 | M. Holman & J.J. Kavelaars | 22,613,200 | 38 | 2,980.4 |
| S/2002 N4 | 2002 | Holman & Gladman et al | 47,279,670 | 60 | 9,007.1 |
| S/2003 N1 | 2003 | D. Jewitt, J. Kleyna & S. Sheppard | 46,738,000 | 38 | 9,136.11 |
| Thalassa | 1989 | Voyager 2 | 50,000 | 90 | 0.31 |
| Triton | 1846 | W. Lassel | 354,800 | 2705 | 5.877 |
| Pluto - 3 Moons | |||||
| year discovered | discoverer | distance from planet (km) | diameter (km) | orbital period (days) | |
|---|---|---|---|---|---|
| Charon | 1978 | J. Christy | 19,571 | 1,207.2 | 6.387 |
| S/2005 P1 | 2005 | A. Stern & H. Weaver et al | 64,500 | 150 | 38 |
| S/2005 P2 | 2005 | A. Stern & H. Weaver et al | 49,500 | 100 | 25.5 |