Jupiter is the largest planet in the solar system and has, as of 2023, 95 known moons. The four largest moons of Jupiter—Io, Callisto, Ganymede, and Europa—were the first objects in the solar system discovered with a telescope. Galileo discovered them in 1610, and they are now called the Galilean satellites. The fifth known Jovian moon, Amalthea, was also discovered by visual observation, by Edward Emerson Barnard in 1892. All the other known satellites were found in photographs or electronic images taken with Earth-based telescopes or by the cameras on the Voyager spacecraft.
The table below lists the moons of Jupiter in increasing order of distance from Jupiter. The table also lists the name of each moon, the year it was discovered, its distance from Jupiter, its orbital period, and its radius.
| name | year discovered | distance from Jupiter (km) | orbital period (days)* | radius (km) |
|---|---|---|---|---|
| Metis | 1979 | 128,000 | 0.3 | 21.5 |
| Adrastea | 1979 | 129,000 | 0.3 | 8.2 |
| Amalthea | 1892 | 181,400 | 0.5 | 83.5 |
| Thebe | 1979 | 221,900 | 0.68 | 49.3 |
| Io | 1610 | 421,800 | 1.77 | 1,821.6 |
| Europa | 1610 | 671,100 | 3.55 | 1,560.8 |
| Ganymede | 1610 | 1,070,400 | 7.16 | 2,631.2 |
| Callisto | 1610 | 1,882,700 | 16.69 | 2,410.3 |
| Themisto | 1975 | 7,507,000 | 130 | 4.0 |
| Leda | 1974 | 11,165,000 | 240.9 | 10.0 |
| S/2018 J2 | 2018 | 11,419,700 | 252.0 | 3.0 |
| Himalia | 1904 | 11,461,000 | 250.6 | 85.0 |
| Ersa | 2018 | 11,483,000 | 252 | 3.0 |
| Pandia | 2017 | 11,525,000 | 252.1 | 3.0 |
| S/2011 J3 | 2011 | 11,716,800 | 263.0 | 3.0 |
| Lysithea | 1938 | 11,717,000 | 259.2 | 18.0 |
| Elara | 1905 | 11,741,000 | 259.6 | 43.0 |
| Dia | 2000 | 12,118,000 | 287 | 2.0 |
| S/2018 J4 | 2018 | 16,328,500 | 434.7 | 2.0 |
| Carpo | 2003 | 16,989,000 | 456.1 | 1.5 |
| Valetudo | 2016 | 18,980,000 | 533.3 | 1.0 |
| S/2003 J12 | 2003 | 19,002,480 | 533.3 R | 0.5 |
| Euporie | 2001 | 19,302,000 | 550.7 R | 1.0 |
| S/2003 J18 | 2003 | 20,274,000 | 588 R | 1.0 |
| S/2010 J2 | 2010 | 20,307,150 | 588.1 R | 1.0 |
| S/2017 J7 | 2017 | 20,627,000 | 602.6 R | 2.0 |
| S/2016 J1 | 2016 | 20,650,845 | 602.7 R | 1.0 |
| S/2017 J3 | 2017 | 20,694,000 | 606.3 R | 2.0 |
| Orthosie | 2001 | 20,721,000 | 622.6 R | 1.0 |
| S/2021 J3 | 2021 | 20,776,700 | 642.8 R | 2.0 |
| Euanthe | 2001 | 20,799,000 | 620.6 R | 1.5 |
| S/2021 J2 | 2021 | 20,926,600 | 627.8 R | 1.0 |
| Thyone | 2001 | 20,940,000 | 627.3 R | 2.0 |
| S/2021 J1 | 2021 | 20,954,700 | 606.4 R | 1.0 |
| S/2003 J16 | 2003 | 21,000,000 | 595.4 R | 2.0 |
| S/2022 J3 | 2022 | 21,047,700 | 617.3 R | 1.0 |
| Mneme | 2003 | 21,069,000 | 620 R | 1.0 |
| Harpalyke | 2000 | 21,105,000 | 623.3 R | 2.2 |
| Hermippe | 2001 | 21,131,000 | 633.9 R | 2.0 |
| Praxidike | 2000 | 21,147,000 | 625.3 R | 3.4 |
| Thelxinoe | 2003 | 21,162,000 | 628.1 R | 1.0 |
| Eupheme | 2003 | 21,199,710 | 627.8 R | 1.0 |
| Helike | 2003 | 21,263,000 | 634.8 R | 2.0 |
| Iocaste | 2000 | 21,269,000 | 631.5 R | 2.6 |
| Ananke | 1951 | 21,276,000 | 610.5 R | 14.0 |
| S/2017 J9 | 2017 | 21,487,000 | 639.2 R | 3.0 |
| S/2003 J9 | 2003 | 22,441,680 | 683 R | 0.5 |
| S/2017 J6 | 2017 | 22,455,000 | 683 R | 2.0 |
| S/2011 J1 | 2011 | 22,462,000 | 686.6 R | 2.0 |
| S/2016 J3 | 2016 | 22,719,300 | 675.7 R | 2.0 |
| S/2022 J1 | 2022 | 22,725,200 | 668.4 R | 2.0 |
| S/2003 J19 | 2003 | 22,757,000 | 697.6 R | 1.0 |
| Philophrosyne | 2003 | 22,819,950 | 701.3 R | 1.0 |
| Eurydome | 2001 | 22,865,000 | 717.3 R | 1.5 |
| S/2021 J6 | 2021 | 22,870,300 | 734.1 R | 1.0 |
| S/2003 J24 | 2003 | 22,887,400 | 715.9 R | 2.0 |
| Arche | 2002 | 22,931,000 | 723.9 R | 1.5 |
| S/2022 J2 | 2022 | 23,013,800 | 686.7 R | 1.0 |
| S/2021 J4 | 2021 | 23,019,700 | 708.6 R | 1.0 |
| Autonoe | 2001 | 23,039,000 | 762.7 R | 2.0 |
| Pasithee | 2001 | 23,096,000 | 719.5 R | 1.0 |
| Herse | 2003 | 23,097,000 | 715.4 R | 1.0 |
| S/2016 J4 | 2016 | 23,113,800 | 743.7 R | 1.0 |
| Chaldene | 2000 | 23,179,000 | 723.8 R | 1.9 |
| Isonoe | 2000 | 23,217,000 | 725.5 R | 1.9 |
| Kale | 2001 | 23,217,000 | 729.5 R | 1.0 |
| Aitne | 2001 | 23,231,000 | 730.2 R | 1.5 |
| S/2017 J5 | 2017 | 23,232,000 | 719.5 R | 2.0 |
| S/2017 J8 | 2017 | 23,232,700 | 719.6 R | 1.0 |
| S/2003 J4 | 2003 | 23,257,920 | 723.2 R | 1.0 |
| Erinome | 2000 | 23,279,000 | 728.3 R | 1.6 |
| S/2017 J2 | 2017 | 23,303,000 | 723.1 R | 2.0 |
| S/2010 J1 | 2010 | 23,314,335 | 723.2 R | 2.0 |
| Taygete | 2000 | 23,360,000 | 732.2 R | 2.5 |
| S/2018 J3 | 2018 | 23,400,300 | 704.9 R | 1.0 |
| Carme | 1938 | 23,404,000 | 702.3 R | 23.0 |
| S/2021 J5 | 2021 | 23,414,600 | 704.9 R | 2.0 |
| S/2011 J2 | 2011 | 23,463,885 | 730.5 R | 1.0 |
| Sponde | 2001 | 23,487,000 | 748.3 R | 1.0 |
| S/2017 J1 | 2017 | 23,547,105 | 734.2 R | 2.0 |
| Kalyke | 2000 | 23,583,000 | 743 R | 2.6 |
| Pasiphae | 1908 | 23,624,000 | 708 R | 30.0 |
| Eukelade | 2003 | 23,661,000 | 746.4 R | 2.0 |
| Eirene | 2003 | 23,731,770 | 759.7 R | 2.0 |
| Megaclite | 2000 | 23,806,000 | 752.8 R | 2.7 |
| Sinope | 1914 | 23,939,000 | 724.5 R | 19.0 |
| Hegemone | 2003 | 23,947,000 | 739.6 R | 1.0 |
| Aoede | 2003 | 23,981,000 | 761.5 R | 2.0 |
| Kallichore | 2003 | 24,043,000 | 764.7 R | 1.0 |
| S/2003 J23 | 2003 | 24,055,000 | 759.7 R | 1.0 |
| Callirrhoe | 1999 | 24,102,000 | 758.8 R | 4.3 |
| S/2003 J10 | 2003 | 24,249,600 | 767 R | 1.0 |
| Cyllene | 2003 | 24,349,000 | 737.8 R | 1.0 |
| Kore | 2003 | 24,543,000 | 779.2 R | 1.0 |
| S/2003 J2 | 2003 | 28,570,410 | 982.5 R | 1.0 |
| *The “R” following the orbital period means the orbit of that satellite is retrograde. | ||||