Moons of Jupiter - wikipedia Moons of Jupiter This article is about the moons of Jupiter. For the Alice Munro short story, see The Moons of Jupiter ( short story ). For the Alice Munro book, see The Moons of Jupiter. For other uses, see Moons of Jupiter ( disambiguation ). A montage of Jupiter and its four largest moons ( distance and sizes not to scale ) The orbit and motion of the Galilean moons around Jupiter, as captured by JunoCam aboard the Juno spacecraft. There are 69 known moons of Jupiter. This gives Jupiter the largest number of moons with reasonably stable orbits of any planet in the Solar System. The most massive of the moons are the four Galilean moons, which were independently discovered in 1610 by Galileo Galilei and Simon Marius and were the first objects found to orbit a body that was neither Earth nor the Sun. From the end of the 19th century, dozens of much smaller Jovian moons have been discovered and have received the names of lovers or daughters of the Roman god Jupiter or his Greek equivalent Zeus. The Galilean moons are by far the largest and most massive objects to orbit Jupiter, with the remaining 65 moons and its rings together comprising just 0.003 % of the total orbiting mass. Of Jupiter 's moons, eight are regular satellites with prograde and nearly circular orbits that are not greatly inclined with respect to Jupiter 's equatorial plane. The Galilean satellites are nearly spherical in shape due to their planetary mass, and so would be considered ( dwarf ) planets if they were in direct orbit around the Sun. The other four regular satellites are much smaller and closer to Jupiter ; these serve as sources of the dust that makes up Jupiter 's rings. The remainder of Jupiter 's moons are irregular satellites whose prograde and retrograde orbits are much farther from Jupiter and have high inclinations and eccentricities. These moons were probably captured by Jupiter from solar orbits. Eighteen of the irregular satellites have not yet been named. Contents 1 Characteristics 2 Origin and evolution 3 Discovery 4 Naming 5 Groups 5.1 Regular satellites 5.2 Irregular satellites 6 List 7 Exploration 8 See also 9 Notes 10 References 11 External links Characteristics The physical and orbital characteristics of the moons vary widely. The four Galileans are all over 3,100 kilometres ( 1,900 mi ) in diameter ; the largest Galilean, Ganymede, is the ninth largest object in the Solar System, after the Sun and seven of the planets, Ganymede being larger than Mercury. All other Jovian moons are less than 250 kilometres ( 160 mi ) in diameter, with most barely exceeding 5 kilometres ( 3.1 mi ). Their orbital shapes range from nearly perfectly circular to highly eccentric and inclined, and many revolve in the direction opposite to Jupiter 's spin ( retrograde motion ). Orbital periods range from seven hours ( taking less time than Jupiter does to spin around its axis ), to some three thousand times more ( almost three Earth years ). Origin and evolution Jupiter 's regular satellites are believed to have formed from a circumplanetary disk, a ring of accreting gas and solid debris analogous to a protoplanetary disk. They may be the remnants of a score of Galilean - mass satellites that formed early in Jupiter 's history. The relative masses of the Jovian moons. Those smaller than Europa are not visible at this scale, and combined would only be visible at 100 × magnification. Simulations suggest that, while the disk had a relatively high mass at any given moment, over time a substantial fraction ( several tenths of a percent ) of the mass of Jupiter captured from the solar nebula was passed through it. However, only 2 % the proto - disk mass of Jupiter is required to explain the existing satellites. Thus there may have been several generations of Galilean - mass satellites in Jupiter 's early history. Each generation of moons might have spiraled into Jupiter, because of drag from the disk, with new moons then forming from the new debris captured from the solar nebula. By the time the present ( possibly fifth ) generation formed, the disk had thinned so that it no longer greatly interfered with the moons ' orbits. The current Galilean moons were still affected, falling into and being partially protected by an orbital resonance with each other, which still exists for Io, Europa, and Ganymede. Ganymede 's larger mass means that it would have migrated inward at a faster rate than Europa or Io. The outer, irregular moons are thought to have originated from captured asteroids, whereas the protolunar disk was still massive enough to absorb much of their momentum and thus capture them into orbit. Many are believed to have broken up by mechanical stresses during capture, or afterward by collisions with other small bodies, producing the moons we see today. Discovery Jupiter and the Galilean moons through a 25 cm ( 10 in ) Meade LX200 telescope The Galilean moons. From left to right, in order of increasing distance from Jupiter : Io, Europa, Ganymede, Callisto The Galilean moons and their orbits around Jupiter See also : Timeline of discovery of Solar System planets and their moons The first claimed observation of one of Jupiter 's moons is that of Chinese astronomer Gan De around 364 BC. However, the first certain observations of Jupiter 's satellites were those of Galileo Galilei in 1609. By January 1610, he had sighted the four massive Galilean moons with his 30 × magnification telescope, and he published his results in March 1610. Simon Marius had independently discovered them one day after Galileo, though he did not publish his book on the subject until 1614, and the names Marius assigned are used today : Ganymede, Callisto, Io, and Europa. No additional satellites were discovered until E.E. Barnard observed Amalthea in 1892. With the aid of telescopic photography, further discoveries followed quickly over the course of the twentieth century. Himalia was discovered in 1904, Elara in 1905, Pasiphae in 1908, Sinope in 1914, Lysithea and Carme in 1938, Ananke in 1951, and Leda in 1974. By the time that Voyager space probes reached Jupiter around 1979, 13 moons had been discovered, not including Themisto which had been observed in 1975, but was lost until 2000 due to insufficient initial observation data. The Voyager spacecraft discovered an additional three inner moons in 1979 : Metis, Adrastea, and Thebe. No additional moons were discovered for two decades but, between October 1999 and February 2003, researchers found and later named another 34 moons using sensitive ground - based detectors. These are tiny moons, in long, eccentric, generally retrograde orbits, and averaging 3 km ( 1.9 mi ) in diameter, with the largest being just 9 km ( 5.6 mi ) across. All of these moons are thought to have been captured asteroidal or perhaps comet bodies, possibly fragmented into several pieces ; but very little is known about them. Since 2003, 18 additional moons have been discovered but not yet named, bringing the total number of known moons of Jupiter to 69. As of 2017, this is the most of any planet in the Solar System ; but additional undiscovered, tiny moons may exist. Some of the 69 known satellites of Jupiter are considered lost because they have not been observed since their discovery and hence their orbits are not well - known enough to pinpoint their current locations. Work has been done to recover many of them in surveys from 2009 onwards ( in which some new moons were also discovered ), but six -- S / 2003 J 12, S / 2003 J 10, S / 2003 J 19, S / 2003 J 4, S / 2003 J 2, and S / 2011 J 1 -- still remain lost today. Follow - up observations in 2018 are planned to secure their orbits and perhaps find new moons. Naming Main article : Naming of moons The Galilean moons of Jupiter ( Io, Europa, Ganymede, and Callisto ) were named by Simon Marius soon after their discovery in 1610. However, these names fell out of favor until the 20th century. The astronomical literature instead simply referred to `` Jupiter I '', `` Jupiter II '', etc., or `` the first satellite of Jupiter '', `` Jupiter 's second satellite '', and so on. The names Io, Europa, Ganymede, and Callisto became popular in the 20th century, whereas the rest of the moons remained unnamed and were usually numbered in Roman numerals V ( 5 ) to XII ( 12 ). Jupiter V was discovered in 1892 and given the name Amalthea by a popular though unofficial convention, a name first used by French astronomer Camille Flammarion. The other moons were simply labeled by their Roman numeral ( e.g. Jupiter IX ) in the majority of astronomical literature until the 1970s. In 1975, the International Astronomical Union 's ( IAU ) Task Group for Outer Solar System Nomenclature granted names to satellites V -- XIII, and provided for a formal naming process for future satellites still to be discovered. The practice was to name newly discovered moons of Jupiter after lovers and favorites of the god Jupiter ( Zeus ) and, since 2004, also after their descendants. All of Jupiter 's satellites from XXXIV ( Euporie ) are named after daughters of Jupiter or Zeus. Names ending with `` a '' or `` o '' are used for prograde irregular satellites ( the latter for highly inclined satellites ), and names ending with `` e '' are used for retrograde irregulars. The most recently confirmed moons Jupiter LI through LX ( with the exception of Jupiter LIII Dia ) have not received names. Some asteroids share the same names as moons of Jupiter : 9 Metis, 38 Leda, 52 Europa, 85 Io, 113 Amalthea, 239 Adrastea. Two more asteroids previously shared the names of Jovian moons until spelling differences were made permanent by the IAU : Ganymede and asteroid 1036 Ganymed ; and Callisto and asteroid 204 Kallisto. Groups The orbits of Jupiter 's irregular satellites, and how they cluster into groups : by semi-major axis ( the horizontal axis in Gm ) ; by orbital inclination ( the vertical axis ) ; and orbital eccentricity ( the yellow lines ). The relative sizes are indicated by the circles. Regular satellites These have prograde and nearly circular orbits of low inclination and are split into two groups : Inner satellites or Amalthea group : Metis, Adrastea, Amalthea, and Thebe. These orbit very close to Jupiter ; the innermost two orbit in less than a Jovian day. The latter two are respectively the fifth and seventh largest moons in the Jovian system. Observations suggest that at least the largest member, Amalthea, did not form on its present orbit, but farther from the planet, or that it is a captured Solar System body. These moons, along with a number of as - yet - unseen inner moonlets, replenish and maintain Jupiter 's faint ring system. Metis and Adrastea help to maintain Jupiter 's main ring, whereas Amalthea and Thebe each maintain their own faint outer rings. Main group or Galilean moons : Io, Europa, Ganymede and Callisto. They are some of the largest objects in the Solar System outside the Sun and the eight planets in terms of mass and are larger than any known dwarf planet. Ganymede exceeds even the planet Mercury in diameter. They are respectively the fourth -, sixth -, first -, and third - largest natural satellites in the Solar System, containing approximately 99.997 % of the total mass in orbit around Jupiter, while Jupiter is almost 5,000 times more massive than the Galilean moons. The inner moons are in a 1 : 2 : 4 orbital resonance. Models suggest that they formed by slow accretion in the low - density Jovian subnebula -- a disc of the gas and dust that existed around Jupiter after its formation -- which lasted up to 10 million years in the case of Callisto. Several are suspected of having subsurface oceans. Irregular satellites Jupiter 's outer moons and their highly inclined orbits Main article : Irregular satellite The irregular satellites are substantially smaller objects with more distant and eccentric orbits. They form families with shared similarities in orbit ( semi-major axis, inclination, eccentricity ) and composition ; it is believed that these are at least partially collisional families that were created when larger ( but still small ) parent bodies were shattered by impacts from asteroids captured by Jupiter 's gravitational field. These families bear the names of their largest members. The identification of satellite families is tentative, but the following are typically listed : Prograde satellites : Themisto is the innermost irregular moon and not part of a known family. The Himalia group is spread over barely 1.4 Gm in semi-major axes, 1.6 ° in inclination ( 27.5 ± 0.8 ° ), and eccentricities between 0.11 and 0.25. It has been suggested that the group could be a remnant of the break - up of an asteroid from the asteroid belt. Carpo is the outermost prograde moon and not part of a known family. Retrograde satellites : inclinations ( ° ) vs. eccentricities, with Carme 's ( orange ) and Ananke 's ( yellow ) groups identified Retrograde satellites : S / 2003 J 12 and S / 2011 J 1 are the innermost of the retrograde moons, and are not part of any known family. The Carme group is spread over only 1.2 Gm in semi-major axis, 1.6 ° in inclination ( 165.7 ± 0.8 ° ), and eccentricities between 0.23 and 0.27. It is very homogeneous in color ( light red ) and is believed to have originated from a D - type asteroid progenitor, possibly a Jupiter Trojan. The Ananke group has a relatively wider spread than the previous groups, over 2.4 Gm in semi-major axis, 8.1 ° in inclination ( between 145.7 ° and 154.8 ° ), and eccentricities between 0.02 and 0.28. Most of the members appear gray, and are believed to have formed from the breakup of a captured asteroid. The Pasiphae group is quite dispersed, with a spread over 1.3 Gm, inclinations between 144.5 ° and 158.3 °, and eccentricities between 0.25 and 0.43. The colors also vary significantly, from red to grey, which might be the result of multiple collisions. Sinope, sometimes included in the Pasiphae group, is red and, given the difference in inclination, it could have been captured independently ; Pasiphae and Sinope are also trapped in secular resonances with Jupiter. S / 2003 J 2 is the outermost moon of Jupiter, and is not part of a known family. List The moons of Jupiter are listed below by orbital period. Moons massive enough for their surfaces to have collapsed into a spheroid are highlighted in bold. These are the four Galilean moons, which are comparable in size to the Moon. The four inner moons are much smaller, the fourth most massive being more than 7000 times more massive than the fifth-most. The irregular captured moons are shaded light gray when prograde and dark gray when retrograde. Order Label Name Pronunciation ( key ) Image Diameter ( km ) Mass ( × 10 kg ) Semi-major axis ( km ) Orbital period ( d ) Inclination ( ° ) Eccentr. Discovery year Discoverer Group 16 ! XVI Metis / ˈmiːtɪs / 0059 ! 60 × 40 × 34 1636 ! ≈ 3.6 00127 ! 7005127690000000000 ♠ 127 690 0074 ! + 7h 4m 29s 00006 ! 0.06 0.0002 1979 Synnott ( Voyager 1 ) Inner 15 ! XV Adrastea / əˈdræstiə / 0020 ! 20 × 16 × 14 152 ! ≈ 0.2 00128 ! 7005128690000000000 ♠ 128 690 0079 ! + 7h 9m 30s 00003 ! 0.03 0.0015 1979 Jewitt ( Voyager 2 ) Inner 05 ! V Amalthea / əˈmælθiə / 0171 ! 250 × 146 × 128 ( 7002167000000000000 ♠ 167 ± 4.0 ) 18208 ! 208 0018 ! 7005181366000000000 ♠ 181 366 008 ! + 11h 57m 23s 000374 ! 0.374 0.0032 1892 Barnard Inner 14 ! XIV Thebe / ˈθiːbiː / 0116 ! 116 × 98 × 84 1743 ! ≈ 43 002 ! 7005221889000000000 ♠ 221 889 009 ! + 16h 11m 17s 001076 ! 1.076 0.0175 1979 Synnott ( Voyager 1 ) Inner 5 01 ! I Io / ˈaɪoʊ / 3660 ! 7003366000000000000 ♠ 3660. 0 × 7003363740000000000 ♠ 3637. 4 × 7003363060000000000 ♠ 3630. 6 2289 ! 7006893190000000000 ♠ 8931900 004 ! 7005421700000000000 ♠ 421 700 01 ! + 7000176910000000000 ♠ 1.7691 00005 ! 0.050 0.0041 1610 Galilei Galilean 6 02 ! II Europa / ˌjʊərˈoʊpə / 3121 ! 7003312160000000000 ♠ 3121. 6 2248 ! 7006480000000000000 ♠ 4800000 006 ! 7005671034000000000 ♠ 671 034 03 ! + 7000355120000000000 ♠ 3.5512 00047 ! 0.471 0.0094 1610 Galilei Galilean 7 03 ! III Ganymede / ˈɡænɪˌmiːd / 5362 ! 7003526239999999999 ♠ 5262. 4 2315 ! 7007148190000000000 ♠ 14 819 000 010 ! 7006107041200000000 ♠ 1070412 07 ! + 7000715460000000000 ♠ 7.1546 000204 ! 0.204 0.0011 1610 Galilei Galilean 8 04 ! IV Callisto / kəˈlɪstoʊ / 4820 ! 7003482060000000000 ♠ 4820. 6 2311 ! 7007107590000000000 ♠ 10 759 000 018 ! 7006188270900000000 ♠ 1882709 08 ! + 7001166890000000000 ♠ 16.689 000205 ! 0.205 0.0074 1610 Galilei Galilean 9 18 ! XVIII Themisto / θɪˈmɪstoʊ / 0008 ! 8 1469 ! 6998690000000000000 ♠ 0.069 07 ! 7006739321600000000 ♠ 7393216 + 129.87 045 ! 45.762 0.2115 1975 / 2000 Kowal & Roemer / Sheppard et al. Themisto 10 13 ! XIII Leda / ˈliːdə / 0016 ! 16 1611 ! 0.6 7007111877810000000 ♠ 11 187 781 + 240.82 027562 ! 27.562 0.1673 Kowal Himalia 11 06 ! VI Himalia / haɪˈmeɪliə / 0170 ! 170 1867 ! 670 7007114519710000000 ♠ 11 451 971 + 250.23 030 ! 30.486 0.1513 1904 Perrine Himalia 12 10 ! X Lysithea / laɪˈsɪθiə / 0036 ! 36 1663 ! 6.3 7007117405600000000 ♠ 11 740 560 + 259.89 027006 ! 27.006 0.1322 1938 Nicholson Himalia 13 07 ! VII Elara / ˈɛlərə / 0086 ! 86 1787 ! 87 7007117780340000000 ♠ 11 778 034 + 257.62 029 ! 29.691 0.1948 1905 Perrine Himalia 14 53 ! LIII Dia / ˈdaɪə / 0004 ! 4 139 ! 6997899999999999999 ♠ 0.0090 7007125704240000000 ♠ 12 570 424 + 287.93 027584 ! 27.584 0.2058 2001 Sheppard et al. Himalia 15 46 ! XLVI Carpo / ˈkɑːrpoʊ / 0003 ! 3 1345 ! 6997449999999999999 ♠ 0.0045 7007171448730000000 ♠ 17 144 873 + 458.62 056 ! 56.001 0.2735 2003 Sheppard et al. Carpo 16 99 ! -- S / 2003 J 12 0001 ! 1 1215 ! 6996150000000000000 ♠ 0.000 15 7007177395390000000 ♠ 17 739 539 − 482.69 142.680 0.4449 2003 Sheppard et al. ? 17 34 ! XXXIV Euporie / juːˈpɒrɪiː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007190884340000000 ♠ 19 088 434 − 538.78 144.694 0.0960 2002 Sheppard et al. Pasiphae 18 60 ! LX S / 2003 J 3 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007196217800000000 ♠ 19 621 780 − 561.52 146.363 0.2507 2003 Sheppard et al. Ananke ? 19 99 ! -- S / 2011 J 1 0001 ! 1 7007201552900000000 ♠ 20 155 290 − 582.22 162.8 0.2963 2011 Sheppard et al. ? 20 55 ! LV S / 2003 J 18 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007202196480000000 ♠ 20 219 648 − 587.38 146.376 0.1048 2003 Gladman et al. Pasiphae 21 52 ! LII S / 2010 J 2 0001 ! 1 7007203071500000000 ♠ 20 307 150 − 588.36 150.4 0.307 Veillet Ananke 22 42 ! XLII Thelxinoe / θɛlkˈsɪnoʊiː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007204537530000000 ♠ 20 453 753 − 597.61 151.292 0.2684 2003 Sheppard et al. Ananke 23 33 ! XXXIII Euanthe / juːˈænθiː / 0003 ! 3 1345 ! 6997449999999999999 ♠ 0.0045 7007204648540000000 ♠ 20 464 854 − 598.09 143.409 0.2000 2002 Sheppard et al. Ananke 24 45 ! XLV Helike / ˈhɛlɪkiː / 0004 ! 4 139 ! 6997899999999999999 ♠ 0.0090 7007205402660000000 ♠ 20 540 266 − 601.40 154.586 0.1374 2003 Sheppard et al. Pasiphae 25 35 ! XXXV Orthosie / ɔːr ˈθɒsɪiː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007205679710000000 ♠ 20 567 971 − 602.62 142.366 0.2433 2002 Sheppard et al. Pasiphae 26 54 ! LIV S / 2016 J 1 0003 ! 3 1315 ! 6997150000000000000 ♠ 0.0015 7007205954830000000 ♠ 20 595 483 − 603.83 139.839 0.1377 2016 Sheppard et al. Pasiphae 27 24 ! XXIV Iocaste / aɪ oʊ ˈkæstiː / 0005 ! 5 1419 ! 6998190000000000000 ♠ 0.019 7007207225660000000 ♠ 20 722 566 − 609.43 147.248 0.2874 2001 Sheppard et al. Ananke 28 99 ! -- S / 2003 J 16 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007207437790000000 ♠ 20 743 779 − 610.36 150.769 0.3184 2003 Gladman et al. Ananke 29 27 ! XXVII Praxidike / prækˈsɪdɪkiː / 0007 ! 7 1443 ! 6998429999999999999 ♠ 0.043 7007208239480000000 ♠ 20 823 948 − 613.90 144.205 0.1840 2001 Sheppard et al. Ananke 30 22 ! XXII Harpalyke / hɑːrˈpælɪkiː / 0004 ! 4 1412 ! 6998120000000000000 ♠ 0.012 7007210638140000000 ♠ 21 063 814 − 624.54 147.223 0.2440 2001 Sheppard et al. Ananke 31 40 ! XL Mneme / ˈniːmiː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007211297860000000 ♠ 21 129 786 − 627.48 149.732 0.3169 2003 Gladman et al. Ananke 32 30 ! XXX Hermippe / hərˈmɪpiː / 0004 ! 4 139 ! 6997899999999999999 ♠ 0.0090 7007211820860000000 ♠ 21 182 086 − 629.81 151.242 0.2290 2002 Sheppard et al. Ananke 33 29 ! XXIX Thyone / θaɪˈoʊniː / 0004 ! 4 139 ! 6997899999999999999 ♠ 0.0090 7007214055700000000 ♠ 21 405 570 − 639.80 147.276 0.2525 2002 Sheppard et al. Ananke 34 12 ! XII Ananke / əˈnæŋkiː / 0028 ! 28 163 ! 3.0 7007214549520000000 ♠ 21 454 952 − 640.38 151.564 0.3445 1951 Nicholson Ananke 35 50 ! L Herse / ˈhɜːrsiː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007221343060000000 ♠ 22 134 306 − 672.75 162.490 0.2379 2003 Gladman et al. Carme 36 31 ! XXXI Aitne / ˈaɪtniː / 0003 ! 3 1345 ! 6997449999999999999 ♠ 0.0045 7007222851610000000 ♠ 22 285 161 − 679.64 165.562 0.3927 2002 Sheppard et al. Carme 37 37 ! XXXVII Kale / ˈkeɪliː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007224092070000000 ♠ 22 409 207 − 685.32 165.378 0.2011 2002 Sheppard et al. Carme 38 20 ! XX Taygete / teɪˈɪdʒɪtiː / 0005 ! 5 1416 ! 6998160000000000000 ♠ 0.016 7007224386480000000 ♠ 22 438 648 − 686.67 164.890 0.3678 2001 Sheppard et al. Carme 39 99 ! -- S / 2003 J 19 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007227090610000000 ♠ 22 709 061 − 699.12 164.727 0.1961 2003 Gladman et al. Carme ? 40 21 ! XXI Chaldene / kælˈdiːniː / 0004 ! 4 1375 ! 6997750000000000000 ♠ 0.0075 7007227134440000000 ♠ 22 713 444 − 699.33 167.070 0.2916 2001 Sheppard et al. Carme 41 58 ! LVIII S / 2003 J 15 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007227209990000000 ♠ 22 720 999 − 699.68 141.812 0.0932 2003 Sheppard et al. Pasiphae 42 99 ! -- S / 2003 J 10 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007227308130000000 ♠ 22 730 813 − 700.13 163.813 0.3438 2003 Sheppard et al. Carme ? 43 99 ! -- S / 2003 J 23 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007227396540000000 ♠ 22 739 654 − 700.54 148.849 0.3930 Sheppard et al. Pasiphae ? 44 25 ! XXV Erinome / ɪˈrɪnoʊmiː / 0003 ! 3 1345 ! 6997449999999999999 ♠ 0.0045 7007229862660000000 ♠ 22 986 266 − 711.96 163.737 0.2552 2001 Sheppard et al. Carme 45 41 ! XLI Aoede / eɪ ˈiːdiː / 0004 ! 4 139 ! 6997899999999999999 ♠ 0.0090 7007230441750000000 ♠ 23 044 175 − 714.66 160.482 0.4311 2003 Sheppard et al. Pasiphae 46 44 ! XLIV Kallichore / kəˈlɪkoʊriː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007231118230000000 ♠ 23 111 823 − 717.81 164.605 0.2041 2003 Sheppard et al. Carme 47 23 ! XXIII Kalyke / ˈkælɪkiː / 0005 ! 5 1419 ! 6998190000000000000 ♠ 0.019 7007231807730000000 ♠ 23 180 773 − 721.02 165.505 0.2139 2001 Sheppard et al. Carme 48 11 ! XI Carme / ˈkɑːrmiː / 0046 ! 46 1713 ! 13 7007231979920000000 ♠ 23 197 992 − 763.95 165.047 0.2342 1938 Nicholson Carme 49 17 ! XVII Callirrhoe / kəˈlɪroʊiː / 0009 ! 9 1487 ! 6998870000000000000 ♠ 0.087 7007232149860000000 ♠ 23 214 986 − 727.11 139.849 0.2582 2000 Spahr, Scotti Pasiphae 50 32 ! XXXII Eurydome / jʊərˈɪdəmiː / 0003 ! 3 1345 ! 6997449999999999999 ♠ 0.0045 7007232308580000000 ♠ 23 230 858 − 723.36 149.324 0.3769 2002 Sheppard et al. Pasiphae 51 38 ! XXXVIII Pasithee / pəˈsɪθɪiː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007233073180000000 ♠ 23 307 318 − 726.93 165.759 0.3288 2002 Sheppard et al. Carme 52 51 ! LI S / 2010 J 1 0002 ! 2 7007233143350000000 ♠ 23 314 335 − 722.83 163.2 0.320 Jacobson et al. Carme 53 49 ! XLIX Kore / ˈkɔəriː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007233450930000000 ♠ 23 345 093 − 776.02 137.371 0.1951 2003 Sheppard et al. Pasiphae 54 48 ! XLVIII Cyllene / sɪˈliːniː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007233962690000000 ♠ 23 396 269 − 731.10 140.148 0.4115 2003 Sheppard et al. Pasiphae 55 56 ! LVI S / 2011 J 2 0001 ! 1 7007234009810000000 ♠ 23 400 981 − 731.32 148.77 0.3321 2011 Sheppard et al. Pasiphae 56 47 ! XLVII Eukelade / juːˈkɛlədiː / 0004 ! 4 139 ! 6997899999999999999 ♠ 0.0090 7007234836940000000 ♠ 23 483 694 − 735.20 163.996 0.2828 2003 Sheppard et al. Carme 57 59 ! LIX S / 2017 J 1 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007234839780000000 ♠ 23 483 978 − 734.15 149.197 0.3969 2017 Sheppard et al. Pasiphae 58 99 ! -- S / 2003 J 4 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007235707900000000 ♠ 23 570 790 − 739.29 147.175 0.3003 2003 Sheppard et al. Pasiphae ? 59 08 ! VIII Pasiphae / pəˈsɪfeɪiː / 0060 ! 60 173 ! 30 7007236090420000000 ♠ 23 609 042 − 739.80 141.803 0.3743 1908 Melotte Pasiphae 60 39 ! XXXIX Hegemone / hɪˈdʒɛməniː / 0003 ! 3 1345 ! 6997449999999999999 ♠ 0.0045 7007237025110000000 ♠ 23 702 511 − 745.50 152.506 0.4077 2003 Sheppard et al. Pasiphae 61 43 ! XLIII Arche / ˈɑːrkiː / 0003 ! 3 1345 ! 6997449999999999999 ♠ 0.0045 7007237170510000000 ♠ 23 717 051 − 746.19 164.587 0.1492 2002 Sheppard et al. Carme 62 26 ! XXVI Isonoe / aɪ ˈsɒnoʊiː / 0004 ! 4 1375 ! 6997750000000000000 ♠ 0.0075 7007238006470000000 ♠ 23 800 647 − 750.13 165.127 0.1775 2001 Sheppard et al. Carme 63 99 ! -- S / 2003 J 9 0001 ! 1 1215 ! 6996150000000000000 ♠ 0.000 15 7007238578080000000 ♠ 23 857 808 − 752.84 164.980 0.2761 2003 Sheppard et al. Carme ? 64 57 ! LVII S / 2003 J 5 0004 ! 4 139 ! 6997899999999999999 ♠ 0.0090 7007239739260000000 ♠ 23 973 926 − 758.34 165.549 0.3070 2003 Sheppard et al. Carme 65 09 ! IX Sinope / sɪˈnoʊpiː / 0038 ! 38 1675 ! 7.5 7007240578650000000 ♠ 24 057 865 − 739.33 153.778 0.2750 1914 Nicholson Pasiphae 66 36 ! XXXVI Sponde / ˈspɒndiː / 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007242526270000000 ♠ 24 252 627 − 771.60 154.372 0.4431 2002 Sheppard et al. Pasiphae 67 28 ! XXVIII Autonoe / ɔː ˈtɒnoʊiː / 0004 ! 4 139 ! 6997899999999999999 ♠ 0.0090 7007242644450000000 ♠ 24 264 445 − 772.17 151.058 0.3690 2002 Sheppard et al. Pasiphae 68 19 ! XIX Megaclite / mɛɡəˈklaɪtiː / 0005 ! 5 1421 ! 6998210000000000000 ♠ 0.021 7007246872390000000 ♠ 24 687 239 − 792.44 150.398 0.3077 2001 Sheppard et al. Pasiphae 69 99 ! -- S / 2003 J 2 0002 ! 2 1315 ! 6997150000000000000 ♠ 0.0015 7007285704100000000 ♠ 28 570 410 9 ! 2997018450000000000 ♠ − 981.55 153.521 0.4074 2003 Sheppard et al. ? Exploration Main articles : Exploration of Jupiter, Ganymede ( moon ) § Exploration, Europa ( moon ) § Exploration, Callisto ( moon ) § Exploration, and Io ( moon ) § Observational history The first spacecraft to visit Jupiter were Pioneer 10 in 1973, and Pioneer 11 a year later, taking low - resolution images of the four Galilean moons. The Voyager 1 and Voyager 2 probes visited Jupiter in 1979, discovering the volcanic activity on Io and the presence of water ice on the surface of Europa. The Cassini probe to Saturn flew by Jupiter in 2000 and collected data on interactions of the Galilean moons with Jupiter 's extended atmosphere. The New Horizons spacecraft flew by Jupiter in 2007 and made improved measurements of its satellites ' orbital parameters. The Galileo spacecraft was the first to enter orbit around Jupiter, arriving in 1995 and studying it until 2003. During this period, Galileo gathered a large amount of information about the Jovian system, making close approaches to all of the Galilean moons and finding evidence for thin atmospheres on three of them, as well as the possibility of liquid water beneath the surfaces of Europa, Ganymede, and Callisto. It also discovered a magnetic field around Ganymede. In 2016, the Juno spacecraft imaged the Galilean moons from above their orbital plane as it approached Jupiter orbit insertion, creating a time - lapse movie of their motion. See also Jupiter 's moons in fiction Notes Jump up ^ Jupiter Mass of 1.8986 × 10 kg / Mass of Galilean moons 3.93 × 10 kg = 4,828 Jump up ^ Order refers to the position among other moons with respect to their average distance from Jupiter. Jump up ^ Label refers to the Roman numeral attributed to each moon in order of their naming. Jump up ^ Diameters with multiple entries such as `` 60 × 40 × 34 '' reflect that the body is not a perfect spheroid and that each of its dimensions have been measured well enough. Jump up ^ Periods with negative values are retrograde. Jump up ^ `` ? '' refers to group assignments that are not considered sure yet. References ^ Jump up to : Sheppard, Scott S. `` The Jupiter Satellite and Moon Page ''. Carnegie Institution, Department of Terrestrial Magnetism. Retrieved 27 August 2016. Jump up ^ `` Solar System Bodies ''. JPL / NASA. Retrieved 2008 - 09 - 09. ^ Jump up to : Canup, Robert M. ; Ward, William R. ( 2009 ). `` Origin of Europa and the Galilean Satellites ''. Europa. University of Arizona Press ( in press ). Bibcode : 2008arXiv0812. 4995C. arXiv : 0812.4995. Jump up ^ Alibert, Y. ; Mousis, O. ; Benz, W. ( 2005 ). `` Modeling the Jovian subnebula I. Thermodynamic conditions and migration of proto - satellites ''. Astronomy & Astrophysics. 439 ( 3 ) : 1205 -- 13. Bibcode : 2005A&A... 439.1205 A. arXiv : astro - ph / 0505367. doi : 10.1051 / 0004 - 6361 : 20052841. ^ Jump up to : Chown, Marcus ( 2009 - 03 - 07 ). `` Cannibalistic Jupiter ate its early moons ''. New Scientist. Retrieved 2009 - 03 - 18. Jump up ^ Jewitt, David ; Haghighipour, Nader ( 2007 ). `` Irregular Satellites of the Planets : Products of Capture in the Early Solar System '' ( PDF ). Annual Review of Astronomy and Astrophysics. 45 ( 1 ) : 261 -- 95. Bibcode : 2007ARA&A... 45... 261J. arXiv : astro - ph / 0703059. doi : 10.1146 / annurev. astro. 44.051905. 092459. Archived from the original ( PDF ) on 2010 - 02 - 07. Jump up ^ Xi, Zezong Z. ( 1981 ). `` The Discovery of Jupiter 's Satellite Made by Gan De 2000 years Before Galileo ''. Acta Astrophysica Sinica. 1 ( 2 ) : 87. Jump up ^ Galilei, Galileo ( 1989 ). Translated and prefaced by Albert Van Helden, ed. Sidereus Nuncius. Chicago & London : University of Chicago Press. pp. 14 -- 16. ISBN 0 - 226 - 27903 - 0. Jump up ^ Van Helden, Albert ( March 1974 ). `` The Telescope in the Seventeenth Century ''. Isis. The University of Chicago Press on behalf of The History of Science Society. 65 ( 1 ) : 38 -- 58. doi : 10.1086 / 351216. Jump up ^ Pasachoff, Jay M. ( 2015 ). `` Simon Marius 's Mundus Iovialis : 400th Anniversary in Galileo 's Shadow ''. Journal for the History of Astronomy. 46 ( 2 ) : 218 -- 234. Bibcode : 2015AAS... 22521505P. doi : 10.1177 / 0021828615585493. Jump up ^ Barnard, E.E. ( 1892 ). `` Discovery and Observation of a Fifth Satellite to Jupiter ''. Astronomical Journal. 12 : 81 -- 85. Bibcode : 1892AJ... 12... 81B. doi : 10.1086 / 101715. Jump up ^ `` Discovery of a Sixth Satellite of Jupiter ''. Astronomical Journal. 24 ( 18 ) : 154B ;. 1905 - 01 - 09. Bibcode : 1905AJ... 24S. 154... doi : 10.1086 / 103654. Jump up ^ Perrine, C.D. ( 1905 ). `` The Seventh Satellite of Jupiter ''. Publications of the Astronomical Society of the Pacific. 17 ( 101 ) : 62 -- 63. Bibcode : 1905PASP... 17... 56... JSTOR 40691209. doi : 10.1086 / 121624. Jump up ^ Melotte, P.J. ( 1908 ). `` Note on the Newly Discovered Eighth Satellite of Jupiter, Photographed at the Royal Observatory, Greenwich ''. Monthly Notices of the Royal Astronomical Society. 68 ( 6 ) : 456 -- 457. Bibcode : 1908MNRAS... 68... 456... doi : 10.1093 / mnras / 68.6. 456. Jump up ^ Nicholson, S.B. ( 1914 ). `` Discovery of the Ninth Satellite of Jupiter ''. Publications of the Astronomical Society of the Pacific. 26 : 197 -- 198. Bibcode : 1914PASP... 26... 197N. doi : 10.1086 / 122336. Jump up ^ Nicholson, S.B. ( 1938 ). `` Two New Satellites of Jupiter ''. Publications of the Astronomical Society of the Pacific. 50 : 292 -- 293. Bibcode : 1938PASP... 50... 292N. doi : 10.1086 / 124963. Jump up ^ Nicholson, S.B. ( 1951 ). `` An unidentified object near Jupiter, probably a new satellite ''. Publications of the Astronomical Society of the Pacific. 63 ( 375 ) : 297 -- 299. Bibcode : 1951PASP... 63... 297N. doi : 10.1086 / 126402. Jump up ^ Kowal, C.T. ; Aksnes, K. ; Marsden, B.G. ; Roemer, E. ( 1974 ). `` Thirteenth satellite of Jupiter ''. Astronomical Journal. 80 : 460 -- 464. Bibcode : 1975AJ... 80... 460K. doi : 10.1086 / 111766. Jump up ^ Marsden, Brian G. ( 3 October 1975 ). `` Probable New Satellite of Jupiter '' ( discovery telegram sent to the IAU ). International Astronomical Union Circulars. Cambridge, US : Smithsonian Astrophysical Observatory. 2845. Retrieved 2011 - 01 - 08. Jump up ^ Synnott, S.P. ( 1980 ). `` 1979J2 : The Discovery of a Previously Unknown Jovian Satellite ''. Science. 210 ( 4471 ) : 786 -- 788. Bibcode : 1980Sci... 210... 786S. PMID 17739548. doi : 10.1126 / science. 210.4471. 786. ^ Jump up to : `` Gazetteer of Planetary Nomenclature ''. Working Group for Planetary System Nomenclature ( WGPSN ). U.S. Geological Survey. 2008 - 11 - 07. Retrieved 2008 - 08 - 02. ^ Jump up to : Sheppard, Scott S. ; Jewitt, David C. ( May 5, 2003 ). `` An abundant population of small irregular satellites around Jupiter ''. Nature. 423 ( 6937 ) : 261 -- 263. Bibcode : 2003Natur. 423... 261S. PMID 12748634. doi : 10.1038 / nature01584. ^ Jump up to : Sheppard, Scott S. `` Jupiter 's Known Satellites ''. Departament of Terrestrial Magnetism at Carniege Institution for science. Retrieved 2008 - 08 - 28. Jump up ^ Beatty, Kelly ( 4 April 2012 ). `` Outer - Planet Moons Found -- and Lost ''. www.skyandtelescope.com. Sky & Telescope. Retrieved 27 June 2017. Jump up ^ Brozović, Marina ; Jacobson, Robert A. ( 9 March 2017 ). `` The Orbits of Jupiter 's Irregular Satellites ''. The Astronomical Journal. 153 ( 4 ). Bibcode : 2017AJ... 153... 147B. doi : 10.3847 / 1538 - 3881 / aa5e4d. Jump up ^ Jacobson, B. ; Brozović, M. ; Gladman, B. ; Alexandersen, M. ; Nicholson, P.D. ; Veillet, C. ( 28 September 2012 ). `` Irregular Satellites of the Outer Planets : Orbital Uncertainties and Astrometric Recoveries in 2009 -- 2011 ''. The Astronomical Journal. 144 ( 5 ). Bibcode : 2012AJ... 144... 132J. doi : 10.1088 / 0004 - 6256 / 144 / 5 / 132. Retrieved 27 June 2017. Jump up ^ Sheppard, Scott S. ( 2017 ). `` New Moons of Jupiter Announced in 2017 ''. home.dtm.ciw.edu. Retrieved 27 June 2017. We likely have all of the lost moons in our new observations from 2017, but to link them back to the remaining lost 2003 objects requires more observations a year later to confirm the linkages, which will not happen until early 2018... There are likely a few more new moons as well in our 2017 observations, but we need to reobserve them in 2018 to determine which of the discoveries are new and which are lost 2003 moons. ^ Jump up to : Marazzini, C. ( 2005 ). `` The names of the satellites of Jupiter : from Galileo to Simon Marius ''. Lettere Italiane ( in Italian ). 57 ( 3 ) : 391 -- 407. Jump up ^ Nicholson, Seth Barnes ( April 1939 ). `` The Satellites of Jupiter ''. Publications of the Astronomical Society of the Pacific. 51 ( 300 ) : 85 -- 94. Bibcode : 1939PASP... 51... 85N. doi : 10.1086 / 125010. Jump up ^ Payne - Gaposchkin, Cecilia ; Haramundanis, Katherine ( 1970 ). Introduction to Astronomy. Englewood Cliffs, N.J. : Prentice - Hall. ISBN 0 - 13 - 478107 - 4. ^ Jump up to : Marsden, Brian G. ( 3 October 1975 ). `` Satellites of Jupiter ''. International Astronomical Union Circulars. 2846. Retrieved 2011 - 01 - 08. ^ Jump up to : Gazetteer of Planetary Nomenclature Planet and Satellite Names and Discoverers International Astronomical Union ( IAU ) Jump up ^ M. Antonietta Barucci, Hermann Boehnhardt, Dale P. Cruikshank, Alessandro Morbidelli, eds. ( 2008 ). `` Irregular Satellites of the Giant Planets ''. The Solar System Beyond Neptune ( PDF ). p. 414. ISBN 9780816527557. CS1 maint : Uses editors parameter ( link ) Jump up ^ Anderson, J.D. ; Johnson, T.V. ; Shubert, G. ; et al. ( 2005 ). `` Amalthea 's Density Is Less Than That of Water ''. Science. 308 ( 5726 ) : 1291 -- 1293. Bibcode : 2005Sci... 308.1291 A. PMID 15919987. doi : 10.1126 / science. 1110422. Jump up ^ Burns, J.A. ; Simonelli, D.P. ; Showalter, M.R. ; et al. ( 2004 ). `` Jupiter 's Ring - Moon System ''. In Bagenal, F. ; Dowling, T.E. ; McKinnon, W.B. Jupiter : The Planet, Satellites and Magnetosphere. Cambridge University Press. Jump up ^ Burns, J.A. ; Showalter, M.R. ; Hamilton, D.P. ; et al. ( 1999 ). `` The Formation of Jupiter 's Faint Rings ''. Science. 284 ( 5417 ) : 1146 -- 1150. Bibcode : 1999Sci... 284.1146 B. PMID 10325220. doi : 10.1126 / science. 284.5417. 1146. Jump up ^ Canup, Robin M. ; Ward, William R. ( 2002 ). `` Formation of the Galilean Satellites : Conditions of Accretion '' ( PDF ). The Astronomical Journal. 124 ( 6 ) : 3404 -- 3423. Bibcode : 2002AJ... 124.3404 C. doi : 10.1086 / 344684. ^ Jump up to : Grav, T. ; Holman, M. ; Gladman, B. ; Aksnes K. ( 2003 ). `` Photometric survey of the irregular satellites ''. Icarus. 166 ( 1 ) : 33 -- 45. Bibcode : 2003Icar... 166... 33G. arXiv : astro - ph / 0301016. doi : 10.1016 / j. icarus. 2003.07. 005. CS1 maint : Multiple names : authors list ( link ) Jump up ^ Sheppard, Scott S. ; Jewitt, David C. ; Porco, Carolyn ( 2004 ). `` Jupiter 's outer satellites and Trojans ''. In Fran Bagenal ; Timothy E. Dowling ; William B. McKinnon. Jupiter. The planet, satellites and magnetosphere ( PDF ). Cambridge planetary science. 1. Cambridge, UK : Cambridge University Press. pp. 263 -- 280. ISBN 0 - 521 - 81808 - 7. Archived from the original ( PDF ) on 2009 - 03 - 26. Jump up ^ Nesvorný, David ; Beaugé, Cristian ; Dones, Luke ( 2004 ). `` Collisional Origin of Families of Irregular Satellites '' ( PDF ). The Astronomical Journal. 127 ( 3 ) : 1768 -- 1783. Bibcode : 2004AJ... 127.1768 N. doi : 10.1086 / 382099. ^ Jump up to : `` Natural Satellites Ephemeris Service ''. IAU : Minor Planet Center. Retrieved 2011 - 01 - 08. Note : some semi-major axis were computed using the μ value, while the eccentricities were taken using the inclination to the local Laplace plane ^ Jump up to : Siedelmann P.K. ; Abalakin V.K. ; Bursa, M. ; Davies, M.E. ; et al. ( 2000 ). The Planets and Satellites 2000 ( Report ). IAU / IAG Working Group on Cartographic Coordinates and Rotational Elements of the Planets and Satellites. Retrieved 2008 - 08 - 31. Jump up ^ `` Amalthea - definition of Amalthea in English from the Oxford dictionary ''. OxfordDictionaries.com. Retrieved 2016 - 01 - 20. Jump up ^ `` Europa - definition of Europa in English from the Oxford dictionary ''. OxfordDictionaries.com. Retrieved 2016 - 01 - 20. Jump up ^ `` Ganymede - definition of Ganymede in English from the Oxford dictionary ''. OxfordDictionaries.com. Retrieved 2016 - 01 - 20. Jump up ^ `` Ganymede ''. Merriam - Webster Dictionary. Jump up ^ File : Pioneer - 10 jupiter moons. jpg Jump up ^ Juno Approach Movie of Jupiter and the Galilean Moons, NASA, July 2016 External links Wikimedia Commons has media related to Moons of Jupiter. Jupiter 's Known Satellites The Jupiter Satellite and Moon Page Simulation showing the position of Jupiter 's moons Animated tour of Jupiter 's moons, University of South Wales Jupiter : Moons by NASA 's Solar System Exploration David Perlman ( 15 May 2003 ). `` 43 more moons orbiting Jupiter ''. San Francisco Chronicle. Archive of Jupiter System Articles in Planetary Science Research Discoveries An animation of the Jovian system of moons Cain, Fraser : Astronomy Cast Ep 57 : Jupiter 's Moons Moons of Jupiter Listed in approximately increasing distance from Jupiter. Provisional designations in italics. Inner moons Metis Adrastea Amalthea Thebe Galilean moons Io Europa Ganymede Callisto Themisto group Themisto Himalia group Leda Himalia Lysithea Elara Dia Carpo group Carpo S / 2003 J 12 S / 2011 J 1 Ananke group Core Euanthe Iocaste Praxidike Harpalyke Thyone Ananke Peripheral Jupiter LX ( ? ) Jupiter LII Thelxinoe S / 2003 J 16 Mneme Hermippe Carme group Herse Kale Aitne Taygete S / 2003 J 19 ( ? ) Chaldene Erinome Kallichore Kalyke Carme Pasithee Jupiter LI Eukelade Arche Isonoe S / 2003 J 9 ( ? ) Jupiter LVII Pasiphae group Euporie Jupiter LV Helike Orthosie Jupiter LIV Jupiter LVIII S / 2003 J 10 ( ? ) S / 2003 J 23 ( ? ) Aoede Callirrhoe Eurydome Kore Cyllene Jupiter LVI Jupiter LIX S / 2003 J 4 ( ? ) Pasiphae Hegemone Sinope Sponde Autonoe Megaclite S / 2003 J 2 Rings of Jupiter In fiction Jupiter Outline of Jupiter Geography Atmosphere Great Red Spot Magnetosphere Rings Moons Inner moons Adrastea Amalthea Metis Thebe Galilean moons Callisto Europa Ganymede Io Irregular moons Ananke group Carme group Himalia group Pasiphae group Ungrouped moons Carpo Themisto S / 2003 J 2 S / 2003 J 12 S / 2011 J 1 Astronomy General Jupiter - crossing minor planets Solar eclipses Trojans Greek camp Trojan camp Impact events Comet Shoemaker -- Levy 9 2009 Jupiter impact event 2010 Jupiter impact event Exploration and orbiting missions Current Juno Past Cassini Galileo New Horizons Pioneer program Pioneer 10 Pioneer 11 Ulysses Voyager program Voyager 1 Voyager 2 Future Jupiter Icy Moons Explorer ( 2022 ) Europa Clipper ( 2025 ) Proposed Io Volcano Observer ( 2021 ) Laplace - P ( 2023 ) Smara ( 2030 ) Related Fiction Jovian Jupiter Moons Mythology Book Portal Natural satellites of the Solar System Planetary satellites Terrestrial Martian Jovian Saturnian Uranian Neptunian Other satellites Minor - planet moons Plutonian Haumean Eridian Makemakean Largest satellites ( mean radius ≥ 100 km ) size Ganymede largest / 2634 km / 0.413 Earths Titan Callisto Io Moon Europa Triton Titania Rhea Oberon Iapetus Charon Umbriel Ariel Dione Tethys ( Dysnomia ) Enceladus Miranda Proteus Mimas ( Hi'iaka ) Nereid Hyperion Phoebe smallest / 106 km / 0.017 Earths abc 's Ariel Callisto Charon Dione ( Dysnomia ) Enceladus Europa Ganymede ( Hi'iaka ) Hyperion Iapetus Io Mimas Miranda Moon Nereid Oberon Phoebe Proteus Rhea Tethys Titan Titania Triton Umbriel Discovery timeline Inner moons Irregular moons List Naming Regular moons Trojan moons NOTE : Italicized moons are not close to being in hydrostatic equilibrium ; ( bracketed ) moons may or may not be close to being in hydrostatic equilibrium. The Solar System The Sun Mercury Venus Earth Mars Ceres Jupiter Saturn Uranus Neptune Pluto Haumea Makemake Eris Planets Terrestrial planets Mercury Venus Earth Mars Giant planets Jupiter Saturn Uranus Neptune Dwarf planets Ceres Pluto Haumea Makemake Eris Rings Jovian Saturnian ( Rhean ) Charikloan Chironean Uranian Neptunian Haumean Moons 1 Terrestrial ( Moon ) Other near - Earth objects 2 Martian Phobos Deimos 69 Jovian Ganymede Callisto Io Europa all 62 Saturnian Titan Rhea Iapetus Dione Tethys Enceladus Mimas Hyperion Phoebe all 27 Uranian Titania Oberon Umbriel Ariel Miranda all 14 Neptunian Triton Proteus Nereid all 5 Plutonian Charon Nix Hydra Kerberos Styx 2 Haumean Hiʻiaka Namaka 1 Makemakean ( S / 2015 ( 136472 ) 1 ) 1 Eridian ( Dysnomia ) Lists Solar System objects By size By discovery date Minor planets Gravitationally rounded objects Possible dwarf planets Natural satellites Comets Small Solar System bodies Meteoroids Minor planets moons Comets Damocloids Mercury - crossers Venus - crossers Venus trojans Near - Earth objects Earth - crossers Earth trojans Mars - crossers Mars trojans Asteroid belt Asteroids first discovered : Ceres Pallas Juno Vesta Families Notable asteroids Kirkwood gap Main - belt comets Jupiter trojans Jupiter - crossers Centaurs Saturn - crossers Uranus trojans Uranus - crossers Neptune trojans Cis - Neptunian objects Trans - Neptunian objects Neptune - crossers Plutoids Kuiper belt Plutinos Cubewanos Scattered disc Detached objects Sednoids Hills cloud Oort cloud Hypothetical objects Vulcan Vulcanoids Phaeton Planet V Theia Fifth giant Planets beyond Neptune Tyche Nemesis Planet Nine Exploration ( outline ) Discovery Astronomy Timeline Spaceflight Robotic spacecraft Human spaceflight Colonization List of probes Timeline Mercury Venus Moon Mars Ceres Asteroids Mining Comets Jupiter Saturn Uranus Neptune Pluto Deep space Outline of the Solar System Portals Solar System Astronomy Earth sciences Mars Jupiter Uranus Cosmology Solar System → Local Interstellar Cloud → Local Bubble → Gould Belt → Orion Arm → Milky Way → Milky Way subgroup → Local Group → Virgo Supercluster → Laniakea Supercluster → Pisces -- Cetus Supercluster Complex → Observable universe → Universe Each arrow ( → ) may be read as `` within '' or `` part of ''. 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Question: which of jupiter's moons is the largest
Answer: Ganymede