Moons of Jupiter

For the short story, see The Moons of Jupiter (short story).
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 67 known moons of Jupiter.[1] This gives Jupiter the largest number of moons with reasonably stable orbits of any planet in the Solar System.[2] 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, conquests, 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 63 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 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. Sixteen irregular satellites have been discovered since 2003 and have not yet been named.

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.[3][4] They may be the remnants of a score of Galilean-mass satellites that formed early in Jupiter's history.[3][5]

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.[3] 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, due to drag from the disk, with new moons then forming from the new debris captured from the Solar nebula.[3] By the time the present (possibly fifth) generation formed, the disk had thinned to the point that it no longer greatly interfered with the moons' orbits.[5] 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.[3]

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 broke up due to the mechanical stresses of capture, or afterward by collisions with other small bodies, producing the moons we see today.[6]

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

The first claimed observation of one of Jupiter's moons is that of Chinese astronomer Gan De around 364 BC.[7] However, the first certain observations of Jupiter's satellites were those of Galileo Galilei in 1609.[8] By January 1610, he had sighted the four massive Galilean moons with his 30× magnification telescope, and he published his results in March 1610.[9] 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.[10] No additional satellites were discovered until E. E. Barnard observed Amalthea in 1892.[11] With the aid of telescopic photography, further discoveries followed quickly over the course of the twentieth century. Himalia was discovered in 1904,[12] Elara in 1905,[13] Pasiphaë in 1908,[14] Sinope in 1914,[15] Lysithea and Carme in 1938,[16] Ananke in 1951,[17] and Leda in 1974.[18] 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,[19] 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.[20]

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.[21] 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;[22] but very little is known about them. Since 2003, 16 additional moons have been discovered but not yet named,[23] bringing the total number of known moons of Jupiter to 67.[1] As of 2013, this is the most of any planet in the Solar System; but additional undiscovered, tiny moons may exist.

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.[24] 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.[24] 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).[25] 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.[21]

The other moons were simply labeled by their Roman numeral (e.g. Jupiter IX) in the majority of astronomical literature until the 1970s.[26] In 1975, the International Astronomical Union's (IAU) Task Group for Outer Solar System Nomenclature granted names to satellites V–XIII,[27] and provided for a formal naming process for future satellites still to be discovered.[27] 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.[28] All of Jupiter's satellites from XXXIV (Euporie) are named after daughters of Jupiter or Zeus.[28]

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.[29] 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.[30][31]
  • 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.[note 1] 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.[32] 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:[23][33][34]

  • Themisto[33] is the innermost irregular moon and not part of a known family.[23]
  • Carpo is the outermost prograde moon and not part of a known family.[23]
Retrograde satellites: inclinations (°) vs. eccentricities, with Carme's (orange) and Ananke's (yellow) groups identified
  • 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.[22]
  • 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.[22]
  • 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.[22] The colors also vary significantly, from red to grey, which might be the result of multiple collisions. Sinope, sometimes included in the Pasiphae group,[22] is red and, given the difference in inclination, it could have been captured independently;[33] Pasiphae and Sinope are also trapped in secular resonances with Jupiter.[35]
  • 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
[note 2]		 Label
[note 3]		 Name
 Pronunciation
(key)		 Image Diameter
(km)[note 4]		 Mass
(×1016 kg)		 Semi-major
axis
(km)[36]		 Orbital period
(d)[36][note 5]		 Inclination
(°)[36]		 Eccentr.
[23]		 Discovery
year[21]		 Discoverer[21] Group
[note 6]
1 XVI Metis /ˈmiːtᵻs/
60 × 40 × 34 ≈ 3.6 127690 +7h 4m 29s 0.06[37] 0.00002 1979 Synnott
(Voyager 1) 		Inner
2XV Adrastea /əˈdræstiə/
20 × 16 × 14 ≈ 0.2 128690 +7h 9m 30s 0.03[37] 0.0015 1979 Jewitt
(Voyager 2)		Inner
3V Amalthea /əˈmælθiə/[38]
250 × 146 × 128
(167±4.0) 		208 181366 +11h 57m 23s 0.374[37] 0.0032 1892 Barnard Inner
4XIV Thebe /ˈθiːbiː/
116 × 98 × 84 ≈ 43 221889 +16h 11m 17s 1.076[37] 0.0175 1979 Synnott
(Voyager 1) 		Inner
5I Io /ˈaɪoʊ/
3660.0
× 3637.4
× 3630.6 		8931900 421700 +1.7691 0.050[37] 0.0041 1610 Galilei Galilean
6II Europa /ˌjʊərˈoʊpə/[39]
3121.6 4800000 671034 +3.5512 0.471[37] 0.0094 1610 Galilei Galilean
7III Ganymede /ˈɡænɪˌmiːd/[40][41]
5262.4 14819000 1070412 +7.1546 0.204[37] 0.0011 1610 Galilei Galilean
8IV Callisto /kəˈlɪstoʊ/
4820.6 10759000 1882709 +16.689 0.205[37] 0.0074 1610 Galilei Galilean
9XVIII Themisto /θᵻˈmɪstoʊ/ 8 0.069 7393216 +129.87 45.762 0.2115 1975/2000 Kowal & Roemer/
Sheppard et al. 		Themisto
10XIII Leda /ˈliːdə/
16 0.6 11187781 +240.82 27.562 0.1673 1974 Kowal Himalia
11VI Himalia /haɪˈmeɪliə/
170 670 11451971 +250.23 30.486 0.1513 1904 Perrine Himalia
12X Lysithea /laɪˈsɪθiə/ 36 6.3 11740560 +259.89 27.006 0.1322 1938 Nicholson Himalia
13VII Elara /ˈɛlərə/
86 87 11778034 +257.62 29.691 0.1948 1905 Perrine Himalia
14 LIII Dia /ˈdaɪə/ 4 0.0090 12570424 +287.93 27.584 0.2058 2001 Sheppard et al. Himalia?
15XLVI Carpo /ˈkɑːrpoʊ/ 3 0.0045 17144873 +458.62 56.001 0.2735 2003 Sheppard et al. Carpo
16 — S/2003 J 12 1 0.00015 17739539 −482.69 142.680 0.4449 2003 Sheppard et al. ?
17XXXIV Euporie /juːˈpɒrᵻiː/ 2 0.0015 19088434 −538.78 144.694 0.0960 2002 Sheppard et al. Ananke
18 — S/2003 J 3 2 0.0015 19621780 −561.52 146.363 0.2507 2003 Sheppard et al. Ananke
19 — S/2003 J 18 2 0.0015 19812577 −569.73 147.401 0.1569 2003 Gladman et al. Ananke
20 — S/2011 J 1 1 20155290 −582.22 162.8 0.2963 2011 Sheppard et al. ?
21 LII S/2010 J 2 1 20307150 −588.36 150.4 0.307 2010 Veillet Ananke?
22XLII Thelxinoe /θɛlkˈsɪnoʊiː/ 2 0.0015 20453753 −597.61 151.292 0.2684 2003 Sheppard et al. Ananke
23XXXIII Euanthe /juːˈænθiː/ 3 0.0045 20464854 −598.09 143.409 0.2000 2002 Sheppard et al. Ananke
24XLV Helike /ˈhɛlᵻkiː/ 4 0.0090 20540266 −601.40 154.586 0.1374 2003 Sheppard et al. Ananke
25XXXV Orthosie /ɔːrˈθɒsᵻiː/ 2 0.0015 20567971 −602.62 142.366 0.2433 2002 Sheppard et al. Ananke
26XXIV Iocaste /aɪoʊˈkæstiː/ 5 0.019 20722566 −609.43 147.248 0.2874 2001 Sheppard et al. Ananke
27 — S/2003 J 16 2 0.0015 20743779 −610.36 150.769 0.3184 2003 Gladman et al. Ananke
28XXVII Praxidike /prækˈsɪdᵻkiː/ 7 0.043 20823948 −613.90 144.205 0.1840 2001 Sheppard et al. Ananke
29XXII Harpalyke /hɑːrˈpælᵻkiː/ 4 0.012 21063814 −624.54 147.223 0.2440 2001 Sheppard et al. Ananke
30XL Mneme /ˈniːmiː/ 2 0.0015 21129786 −627.48 149.732 0.3169 2003 Gladman et al. Ananke
31XXX Hermippe /hərˈmɪpiː/ 4 0.0090 21182086 −629.81 151.242 0.2290 2002 Sheppard et al. Ananke?
32XXIX Thyone /θaɪˈoʊniː/ 4 0.0090 21405570 −639.80 147.276 0.2525 2002 Sheppard et al. Ananke
33XII Ananke /əˈnæŋkiː/ 28 3.0 21454952 −640.38 151.564 0.3445 1951 Nicholson Ananke
34 L Herse /ˈhɜːrsiː/ 2 0.0015 22134306 −672.75 162.490 0.2379 2003 Gladman et al. Carme
35XXXI Aitne /ˈaɪtniː/ 3 0.0045 22285161 −679.64 165.562 0.3927 2002 Sheppard et al. Carme
36XXXVII Kale /ˈkeɪliː/ 2 0.0015 22409207 −685.32 165.378 0.2011 2002 Sheppard et al. Carme
37XX Taygete /teɪˈɪdʒᵻtiː/ 5 0.016 22438648 −686.67 164.890 0.3678 2001 Sheppard et al. Carme
38 — S/2003 J 19 2 0.0015 22709061 −699.12 164.727 0.1961 2003 Gladman et al. Carme
39XXI Chaldene /kælˈdiːniː/ 4 0.0075 22713444 −699.33 167.070 0.2916 2001 Sheppard et al. Carme
40 — S/2003 J 15 2 0.0015 22720999 −699.68 141.812 0.0932 2003 Sheppard et al. Ananke?
41 — S/2003 J 10 2 0.0015 22730813 −700.13 163.813 0.3438 2003 Sheppard et al. Carme?
42 — S/2003 J 23 2 0.0015 22739654 −700.54 148.849 0.3930 2004 Sheppard et al. Pasiphae
43XXV Erinome /ᵻˈrɪnoʊmiː/ 3 0.0045 22986266 −711.96 163.737 0.2552 2001 Sheppard et al. Carme
44XLI Aoede /eɪˈiːdiː/ 4 0.0090 23044175 −714.66 160.482 0.6011 2003 Sheppard et al. Pasiphae
45XLIV Kallichore /kəˈlɪkoʊriː/ 2 0.0015 23111823 −717.81 164.605 0.2041 2003 Sheppard et al. Carme?
46XXIII Kalyke /ˈkælᵻkiː/ 5 0.019 23180773 −721.02 165.505 0.2139 2001 Sheppard et al. Carme
47XI Carme /ˈkɑːrmiː/ 46 13 23197992 −763.95 165.047 0.2342 1938 Nicholson Carme
48XVII Callirrhoe /kəˈlɪroʊiː/
9 0.087 23214986 −727.11 139.849 0.2582 2000 Spahr, Scotti Pasiphae
49XXXII Eurydome /jʊərˈɪdəmiː/ 3 0.0045 23230858 −723.36 149.324 0.3769 2002 Sheppard et al. Pasiphae?
50 — S/2011 J 2 1 23329710 −725.06 151.8 0.3867 2011 Sheppard et al. Pasiphae?
51XXXVIII Pasithee /pəˈsɪθᵻiː/ 2 0.0015 23307318 −726.93 165.759 0.3288 2002 Sheppard et al. Carme
52 LI S/2010 J 1 2 23314335 −722.83 163.2 0.320 2010 Jacobson et al. Carme?
53 XLIX Kore /ˈkɔəriː/ 2 0.0015 23345093 −776.02 137.371 0.1951 2003 Sheppard et al. Pasiphae
54XLVIII Cyllene /sᵻˈliːniː/ 2 0.0015 23396269 −731.10 140.148 0.4115 2003 Sheppard et al. Pasiphae
55XLVII Eukelade /juːˈkɛlədiː/ 4 0.0090 23483694 −735.20 163.996 0.2828 2003 Sheppard et al. Carme
56 — S/2003 J 4 2 0.0015 23570790 −739.29 147.175 0.3003 2003 Sheppard et al. Pasiphae
57VIII Pasiphae /pəˈsɪfeɪiː/ 60 30 23609042 −739.80 141.803 0.3743 1908 Melotte Pasiphae
58XXXIX Hegemone /hᵻˈdʒɛməniː/ 3 0.0045 23702511 −745.50 152.506 0.4077 2003 Sheppard et al. Pasiphae
59XLIII Arche /ˈɑːrkiː/ 3 0.0045 23717051 −746.19 164.587 0.1492 2002 Sheppard et al. Carme
60XXVI Isonoe /aɪˈsɒnoʊiː/ 4 0.0075 23800647 −750.13 165.127 0.1775 2001 Sheppard et al. Carme
61 — S/2003 J 9 1 0.00015 23857808 −752.84 164.980 0.2761 2003 Sheppard et al. Carme
62 — S/2003 J 5 4 0.0090 23973926 −758.34 165.549 0.3070 2003 Sheppard et al. Carme
63IX Sinope /sᵻˈnoʊpiː/ 38 7.5 24057865 −739.33 153.778 0.2750 1914 Nicholson Pasiphae
64XXXVI Sponde /ˈspɒndiː/ 2 0.0015 24252627 −771.60 154.372 0.4431 2002 Sheppard et al. Pasiphae
65XXVIIIAutonoe /ɔːˈtɒnoʊiː/ 4 0.0090 24264445 −772.17 151.058 0.3690 2002 Sheppard et al. Pasiphae
66XIX Megaclite /mɛɡəˈklaɪtiː/ 5 0.021 24687239 −792.44 150.398 0.3077 2001 Sheppard et al. Pasiphae
67 — S/2003 J 2 2 0.0015 30290846 −1077.02 153.521 0.1882 2003 Sheppard et al. ?

Exploration

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.[42] 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.[43]

See also

Notes

  1. ↑ Jupiter Mass of 1.8986 × 1027 kg / Mass of Galilean moons 3.93 × 1023 kg = 4,828
  2. ↑ Order refers to the position among other moons with respect to their average distance from Jupiter.
  3. ↑ Label refers to the Roman numeral attributed to each moon in order of their naming.
  4. ↑ 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.
  5. ↑ Periods with negative values are retrograde.
  6. ↑ "?" refers to group assignments that are not considered sure yet.

References

  1. 1 2 Sheppard, Scott S. "The Jupiter Satellite and Moon Page". Carnegie Institution, Department of Terrestrial Magnetism. Retrieved 27 August 2016.
  2. ↑ "Solar System Bodies". JPL/NASA. Retrieved 2008-09-09.
  3. 1 2 3 4 5 Canup, Robert M.; Ward, William R. (2009). "Origin of Europa and the Galilean Satellites". Europa. University of Arizona Press (in press). Bibcode:2008arXiv0812.4995C.
  4. ↑ 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. arXiv:astro-ph/0505367Freely accessible. Bibcode:2005A&A...439.1205A. doi:10.1051/0004-6361:20052841.
  5. 1 2 Chown, Marcus (2009-03-07). "Cannibalistic Jupiter ate its early moons". New Scientist. Retrieved 2009-03-18.
  6. ↑ 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. arXiv:astro-ph/0703059Freely accessible. Bibcode:2007ARA&A..45..261J. doi:10.1146/annurev.astro.44.051905.092459.
  7. ↑ Xi, Zezong Z. (1981). "The Discovery of Jupiter's Satellite Made by Gan De 2000 years Before Galileo". Acta Astrophysica Sinica. 1 (2): 87.
  8. ↑ 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.
  9. ↑ 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.
  10. ↑ 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.
  11. ↑ 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.
  12. ↑ "Discovery of a Sixth Satellite of Jupiter". Astronomical Journal. 24 (18): 154B;. 1905-01-09. Bibcode:1905AJ.....24S.154.. doi:10.1086/103654.
  13. ↑ 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.. doi:10.1086/121624. JSTOR 40691209.
  14. ↑ 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.
  15. ↑ 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.
  16. ↑ 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.
  17. ↑ 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.
  18. ↑ 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.
  19. ↑ 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.
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  35. ↑ Nesvorný, David; Beaugé, Cristian; Dones, Luke (2004). "Collisional Origin of Families of Irregular Satellites" (PDF). The Astronomical Journal. 127 (3): 1768–1783. Bibcode:2004AJ....127.1768N. doi:10.1086/382099.
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  39. ↑ "Europa - definition of Europa in English from the Oxford dictionary". OxfordDictionaries.com. Retrieved 2016-01-20.
  40. ↑ "Ganymede - definition of Ganymede in English from the Oxford dictionary". OxfordDictionaries.com. Retrieved 2016-01-20.
  41. ↑ "Ganymede". Merriam-Webster Dictionary.
  42. ↑ File:Pioneer-10 jupiter moons.jpg
  43. ↑ Juno Approach Movie of Jupiter and the Galilean Moons, NASA, July 2016
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