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Moon count, as of September 2026
How many moons does Jupiter have?
115 known moons.
Jupiter has 115 known moons as of September 2026, according to NASA and the JPL Solar System Dynamics group. The 57 largest are listed below; the other 58 are small moons, most only a few kilometres across and found since 2000, and many do not yet have names.
The named moons
Sorted by size. Distance is the average distance from the centre of Jupiter.
| Moon | Diameter (miles / km) | Distance (miles / km) | One orbit | Discovered |
|---|---|---|---|---|
| Ganymede | 3,270 / 5,268 | 665,000 / 1,070,412 | 7.155 days | 1610, Galileo |
| Callisto | 3,000 / 4,821 | 1,170,000 / 1,882,709 | 16.69 days | 1610, Galileo |
| Io | 2,260 / 3,643 | 262,000 / 421,700 | 1.769 days | 1610, Galileo |
| Europa | 1,940 / 3,122 | 417,000 / 671,034 | 3.551 days | 1610, Galileo |
| Amalthea | 104 / 167 | 113,000 / 181,366 | 12 hours | 1892, Edward Barnard |
| Himalia | 87 / 140 | 7,120,000 / 11,460,000 | 0.7 years | 1904, Charles Perrine |
| Thebe | 61.5 / 99 | 138,000 / 221,900 | 16 hours | 1979, Voyager 1 |
| Elara | 49.7 / 80 | 7,290,000 / 11,740,000 | 0.7 years | 1905, Charles Perrine |
| Pasiphae | 36 / 58 | 14,700,000 / 23,620,000 | 2.0 years | 1908, Philibert Melotte |
| Carme | 28.6 / 46 | 14,500,000 / 23,400,000 | 2.0 years | 1938, Seth Nicholson |
| Metis | 26.7 / 43 | 79,500 / 128,000 | 7 hours | 1979, Voyager 1 |
| Sinope | 23.6 / 38 | 14,900,000 / 23,940,000 | 2.1 years | 1914, Seth Nicholson |
| Lysithea | 22.4 / 36 | 7,280,000 / 11,720,000 | 0.7 years | 1938, Seth Nicholson |
| Ananke | 17.4 / 28 | 13,200,000 / 21,280,000 | 1.7 years | 1951, Seth Nicholson |
| Leda | 12.4 / 20 | 6,940,000 / 11,165,000 | 0.7 years | 1974, Charles Kowal |
| Adrastea | 9.9 / 16 | 80,200 / 129,000 | 7 hours | 1979, Voyager 2 |
| Callirrhoe | 6 / 9.6 | 14,800,000 / 23,789,400 | -17995 hours | 1999, Jim Scotti and team |
| Themisto | 5.6 / 9 | 4,600,000 / 7,397,000 | 0.4 years | 1975, Charles Kowal and Elizabeth Roemer |
| Praxidike | 4.4 / 7 | 13,000,000 / 20,931,100 | -14849 hours | 2000, Scott Sheppard and team |
| Kalyke | 4.3 / 6.9 | 14,500,000 / 23,298,000 | -17441 hours | 2000, Scott Sheppard and team |
| Megaclite | 3.7 / 6 | 14,700,000 / 23,640,100 | -17826 hours | 2000, Scott Sheppard and team |
| Taygete | 3.1 / 5 | 14,400,000 / 23,103,400 | -17222 hours | 2000, Scott Sheppard and team |
| Iocaste | 3.1 / 5 | 13,100,000 / 21,062,300 | -14989 hours | 2000, Scott Sheppard and team |
| Chaldene | 2.5 / 4 | 14,200,000 / 22,926,300 | -17025 hours | 2000, Scott Sheppard and team |
| Harpalyke | 2.5 / 4 | 13,000,000 / 20,887,500 | -14803 hours | 2000, Scott Sheppard and team |
| Isonoe | 2.5 / 4 | 14,300,000 / 22,976,300 | -17080 hours | 2000, Scott Sheppard and team |
| Autonoe | 2.5 / 4 | 14,800,000 / 23,785,200 | -17991 hours | 2001, Scott Sheppard and team |
| Thyone | 2.5 / 4 | 13,000,000 / 20,972,700 | -14894 hours | 2001, Scott Sheppard and team |
| Hermippe | 2.5 / 4 | 13,100,000 / 21,103,600 | -15033 hours | 2001, Scott Sheppard and team |
| Aoede | 2.5 / 4 | 14,800,000 / 23,773,100 | -17978 hours | 2003, Scott S. Sheppard |
| Helike | 2.5 / 4 | 13,000,000 / 20,911,400 | -14829 hours | 2003, Scott S. Sheppard |
| Eukelade | 2.5 / 4 | 14,300,000 / 23,062,400 | -17177 hours | 2003, Scott S. Sheppard |
| Dia | 2.5 / 4 | 7,620,000 / 12,257,900 | 0.8 years | 2000, Scott Sheppard and team |
| Eirene | 2.5 / 4 | 14,300,000 / 23,051,300 | -17165 hours | 2003, Scott S. Sheppard |
| Erinome | 1.9 / 3 | 14,300,000 / 23,027,200 | -17137 hours | 2000, Scott Sheppard and team |
| Aitne | 1.9 / 3 | 14,300,000 / 23,059,400 | -17173 hours | 2001, Scott Sheppard and team |
| Eurydome | 1.9 / 3 | 14,200,000 / 22,894,500 | -16989 hours | 2001, Scott Sheppard and team |
| Euanthe | 1.9 / 3 | 12,900,000 / 20,822,900 | -14734 hours | 2001, Scott Sheppard and team |
| Hegemone | 1.9 / 3 | 14,500,000 / 23,342,600 | -17490 hours | 2003, Scott S. Sheppard |
| Arche | 1.9 / 3 | 14,300,000 / 23,093,200 | -17211 hours | 2002, Scott S. Sheppard |
| Carpo | 1.9 / 3 | 10,600,000 / 17,039,500 | 1.2 years | 2003, Scott S. Sheppard |
| Pandia | 1.9 / 3 | 7,130,000 / 11,479,600 | 0.7 years | 2017, Scott S. Sheppard |
| Ersa | 1.9 / 3 | 7,080,000 / 11,399,400 | 0.7 years | 2018, Scott S. Sheppard |
| Euporie | 1.2 / 2 | 12,000,000 / 19,261,900 | -13108 hours | 2001, Scott Sheppard and team |
| Orthosie | 1.2 / 2 | 13,000,000 / 20,897,800 | -14814 hours | 2001, Scott Sheppard and team |
| Sponde | 1.2 / 2 | 14,600,000 / 23,538,700 | -17711 hours | 2001, Scott Sheppard and team |
| Kale | 1.2 / 2 | 14,300,000 / 23,047,800 | -17160 hours | 2001, Scott Sheppard and team |
| Pasithee | 1.2 / 2 | 14,200,000 / 22,840,800 | -16930 hours | 2001, Scott Sheppard and team |
| Mneme | 1.2 / 2 | 12,900,000 / 20,815,800 | -14727 hours | 2003, Scott Sheppard and Brett Gladman |
| Thelxinoe | 1.2 / 2 | 13,000,000 / 20,972,300 | -14893 hours | 2003, Scott Sheppard, Brett Gladman and team |
| Kallichore | 1.2 / 2 | 14,300,000 / 23,017,100 | -17126 hours | 2003, Scott S. Sheppard |
| Cyllene | 1.2 / 2 | 14,700,000 / 23,650,000 | -17837 hours | 2003, Scott S. Sheppard |
| Kore | 1.2 / 2 | 15,000,000 / 24,203,300 | -18466 hours | 2003, Scott S. Sheppard |
| Herse | 1.2 / 2 | 14,400,000 / 23,146,700 | -17271 hours | 2003, Brett Gladman and team |
| Philophrosyne | 1.2 / 2 | 14,000,000 / 22,600,200 | -16661 hours | 2003, Scott S. Sheppard |
| Eupheme | 1.2 / 2 | 12,900,000 / 20,763,400 | -14672 hours | 2003, Scott S. Sheppard |
| Valetudo | 0.62 / 1 | 11,600,000 / 18,690,100 | 1.4 years | 2016, Scott S. Sheppard |
Why the number keeps changing
Big moons were found centuries ago through telescopes. The small ones, often only a few kilometres across, are found today by long camera exposures on the largest telescopes and by spacecraft. Each new batch is announced by the Minor Planet Center, so the count goes up in jumps. That is why every count on this site carries a date.