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Jupiter Jupiter symbol (bold).svg
Jupiter and its shrunken Great Red Spot.jpg
Full disk view in natural color, taken by the Hubble Space Telescope in April 2014 [lower-alpha 1]
Pronunciation /ˈpɪtər/ ( Loudspeaker.svg listen ) [1]
Named after
Adjectives Jovian /ˈviən/
Orbital characteristics [2]
Epoch J2000
Aphelion 816.62  Gm (5.4588  AU)
Perihelion 740.52 Gm (4.9501 AU)
778.57 Gm (5.2044 AU)
Eccentricity 0.0489
398.88 d
Average orbital speed
13.07 km/s (8.12 mi/s)
20.020° [4]
21 January 2023 [6]
273.867° [4]
Known satellites 80 (as of 2021) [7]
Physical characteristics [2] [8] [9]
Mean radius
69,911 km (43,441 mi) [lower-alpha 2]
10.973 Earths
Equatorial radius
Polar radius
Flattening 0.06487
  • 6.1469×1010 km2 (2.3733×1010 sq mi)
  • 120.4 Earths
  • 1.8982×1027 kg (4.1848×1027 lb)
  • 317.8 Earths
  • 1/1047 Sun [10]
Mean density
1,326  kg/m3 (2,235  lb/cu yd) [lower-alpha 3]
24.79  m/s2 (81.3  ft/s2) [lower-alpha 2]
2.528  g
0.2756±0.0006 [11]
59.5 km/s (37.0 mi/s) [lower-alpha 2]
9.9258 h (9 h 55 m 33 s) [3]
9.9250 hours (9 h 55 m 30 s)
Equatorial rotation velocity
12.6 km/s (7.8 mi/s; 45,000 km/h)
3.13° (to orbit)
North pole right ascension
268.057°; 17h 52m 14s
North pole declination
Albedo 0.503 (Bond) [12]
0.538 (geometric) [13]
Surface temp. minmeanmax
1 bar 165 K
0.1 bar78 K128 K1000 K
−2.94 [14] to −1.66 [14]
29.8" to 50.1"
Atmosphere [2]
Surface pressure
200–600 kPa (opaque cloud deck) [15]
27 km (17 mi)
Composition by volume
  • 89%±2.0% hydrogen (H2)
  • 10%±2.0% helium (He)
  • 0.3%±0.1% methane (CH4)
  • 0.026%±0.004% ammonia (NH3)
  • 0.0028%±0.001% hydrogen deuteride (HD)
  • 0.0006%±0.0002% ethane (C2H6)
  • 0.0004%±0.0004% water (H2O)

    Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant with a mass more than two and a half times that of all the other planets in the Solar System combined, but slightly less than one-thousandth the mass of the Sun. Jupiter is the third brightest natural object in the Earth's night sky after the Moon and Venus. People have been observing it since prehistoric times; it was named after the Roman god Jupiter, the king of the gods, because of its observed size.


    Jupiter is primarily composed of hydrogen, but helium constitutes one-quarter of its mass and one-tenth of its volume. It likely has a rocky core of heavier elements, [16] but, like the other giant planets, Jupiter lacks a well-defined solid surface. The ongoing contraction of its interior generates heat greater than the amount received from the Sun. Because of its rapid rotation, the planet's shape is an oblate spheroid; it has a slight but noticeable bulge around the equator. The outer atmosphere is visibly segregated into several bands at different latitudes, with turbulence and storms along their interacting boundaries. A prominent result of this is the Great Red Spot, a giant storm known to have existed since at least the 17th century when telescopes first saw it.

    Surrounding Jupiter is a faint planetary ring system and a powerful magnetosphere. Jupiter's magnetic tail is nearly 800 million  km (5.3  AU ; 500 million  mi ) long, covering the entire distance to Saturn's orbit. Jupiter has 80 known moons and possibly many more, [7] including the four large Galilean moons discovered by Galileo Galilei in 1610. Ganymede, the largest of these, has a diameter greater than that of the planet Mercury.

    Pioneer 10 was the first spacecraft to visit Jupiter, making its closest approach to the planet in December 1973. [17] Jupiter has since been explored on several occasions by robotic spacecraft, beginning with the Pioneer and Voyager flyby missions from 1973 to 1979, and later by the Galileo orbiter, which arrived at Jupiter in 1995. [18] In 2007, the New Horizons visited Jupiter using its gravity to increase its speed, bending its trajectory en route to Pluto. The latest probe to visit the planet, Juno , entered orbit around Jupiter in July 2016. [19] [20] Future targets for exploration in the Jupiter system include the probable ice-covered liquid ocean of Europa. [21]

    The planetary symbol for Jupiter, Jupiter symbol (fixed width).svg , descends from a Greek zeta with a horizontal stroke, Ƶ, as an abbreviation for Zeus (the Greek name for the planet). [22]

    Formation and migration

    Jupiter is most likely the oldest planet in the Solar System. [23] Current models of Solar System formation suggest that Jupiter formed at or beyond the snow line; a distance from the early Sun where the temperature is sufficiently cold for volatiles such as water to condense into solids. [24] It first assembled a large solid core before accumulating its gaseous atmosphere. As a consequence, the core must have formed before the solar nebula began to dissipate after 10 million years. Formation models suggest Jupiter grew to 20 times the mass of the Earth in under a million years. The orbiting mass created a gap in the disk, thereafter slowly increasing to 50 Earth masses in 3–4 million years. [23]

    According to the "grand tack hypothesis", Jupiter would have begun to form at a distance of roughly 3.5  AU (520 million  km ; 330 million  mi ). As the young planet accreted mass, interaction with the gas disk orbiting the Sun and orbital resonances with Saturn [24] caused it to migrate inward. [25] This would have upset the orbits of what are believed to be super-Earths orbiting closer to the Sun, causing them to collide destructively. Saturn would later have begun to migrate inwards too, much faster than Jupiter, leading to the two planets becoming locked in a 3:2 mean motion resonance at approximately 1.5 AU (220 million km; 140 million mi). This, in turn, would have changed the direction of migration, causing them to migrate away from the Sun and out of the inner system to their current locations. [26] These migrations would have occurred over an 800,000-year time period, [25] with all of this happening over a time period of up to 6 million years after Jupiter began to form (3 million being a more likely figure). [27] This departure would have allowed the formation of the inner planets from the rubble, including Earth. [28]

    However, the formation timescales of terrestrial planets resulting from the grand tack hypothesis appear inconsistent with the measured terrestrial composition. [29] Moreover, the likelihood that the outward migration actually occurred in the solar nebula is very low. [30] In fact, some models predict the formation of Jupiter's analogues whose properties are close to those of the planet at the current epoch. [31]

    Other models have Jupiter forming at distances much further out, such as 18 AU (2.7 billion km; 1.7 billion mi). [32] [33] In fact, based on Jupiter's composition, researchers have made the case for an initial formation outside the molecular nitrogen (N2) snowline, which is estimated at 20–30 AU (3.0–4.5 billion km; 1.9–2.8 billion mi), [34] [35] and possibly even outside the argon snowline, which may be as far as 40 AU (6.0 billion km; 3.7 billion mi). Having formed at one of these extreme distances, Jupiter would then have migrated inwards to its current location. This inward migration would have occurred over a roughly 700,000-year time period, [32] [33] during an epoch approximately 2–3 million years after the planet began to form. Saturn, Uranus and Neptune would have formed even further out than Jupiter, and Saturn would also have migrated inwards.

    Physical characteristics

    Jupiter is one of the two gas giants, being primarily composed of gas and liquid rather than solid matter. It is the largest planet in the Solar System, with a diameter of 142,984 km (88,846 mi) at its equator. [36] The average density of Jupiter, 1.326 g/cm3, is the second highest of the giant planets, but lower than those of the four terrestrial planets. [37]


    Jupiter's upper atmosphere is about 90% hydrogen and 10% helium by volume. Since helium atoms are more massive than hydrogen molecules, Jupiter's atmosphere is approximately 75% hydrogen and 24% helium by mass, with the remaining one percent consisting of other elements. The atmosphere contains trace amounts of methane, water vapour, ammonia, and silicon-based compounds. There are also fractional amounts of carbon, ethane, hydrogen sulfide, neon, oxygen, phosphine, and sulfur. The outermost layer of the atmosphere contains crystals of frozen ammonia. Through infrared and ultraviolet measurements, trace amounts of benzene and other hydrocarbons have also been found. [38] The interior of Jupiter contains denser materials—by mass it is roughly 71% hydrogen, 24% helium, and 5% other elements. [39] [40]

    The atmospheric proportions of hydrogen and helium are close to the theoretical composition of the primordial solar nebula. Neon in the upper atmosphere only consists of 20 parts per million by mass, which is about a tenth as abundant as in the Sun. [41] Helium is also depleted to about 80% of the Sun's helium composition. This depletion is a result of precipitation of these elements as helium-rich droplets deep in the interior of the planet. [42]

    Based on spectroscopy, Saturn is thought to be similar in composition to Jupiter, but the other giant planets Uranus and Neptune have relatively less hydrogen and helium and relatively more of the next most abundant elements, including oxygen, carbon, nitrogen, and sulfur. [43] As their volatile compounds are mainly in ice form, they are called ice giants.

    Mass and size

    Jupiter's diameter is one order of magnitude smaller (x0.10045) than that of the Sun, and one order of magnitude larger (x10.9733) than that of Earth. The Great Red Spot is roughly the same size as Earth. SolarSystem OrdersOfMagnitude Sun-Jupiter-Earth-Moon.jpg
    Jupiter's diameter is one order of magnitude smaller (×0.10045) than that of the Sun, and one order of magnitude larger (×10.9733) than that of Earth. The Great Red Spot is roughly the same size as Earth.

    Jupiter's mass is 2.5 times that of all the other planets in the Solar System combined—this is so massive that its barycentre with the Sun lies above the Sun's surface at 1.068  solar radii from the Sun's centre. [44] Jupiter is much larger than Earth and considerably less dense: its volume is that of about 1,321 Earths, but it is only 318 times as massive. [2] [45] Jupiter's radius is about one tenth the radius of the Sun, [46] and its mass is one thousandth the mass of the Sun, so the densities of the two bodies are similar. [47] A "Jupiter mass" (MJ or MJup) is often used as a unit to describe masses of other objects, particularly extrasolar planets and brown dwarfs. For example, the extrasolar planet HD 209458 b has a mass of 0.69 MJ, while Kappa Andromedae b has a mass of 12.8 MJ. [48]

    Theoretical models indicate that if Jupiter had much more mass than it does at present, it would shrink. [49] For small changes in mass, the radius would not change appreciably, and above 160% [49] of the current mass the interior would become so much more compressed under the increased pressure that its volume would decrease despite the increasing amount of matter. As a result, Jupiter is thought to have about as large a diameter as a planet of its composition and evolutionary history can achieve. [50] The process of further shrinkage with increasing mass would continue until appreciable stellar ignition was achieved, as in high-mass brown dwarfs having around 50 Jupiter masses. [51]

    Although Jupiter would need to be about 75 times more massive to fuse hydrogen and become a star, the smallest red dwarf is only about 30 percent larger in radius than Jupiter. [52] [53] Despite this, Jupiter still radiates more heat than it receives from the Sun; the amount of heat produced inside it is similar to the total solar radiation it receives. [54] This additional heat is generated by the Kelvin–Helmholtz mechanism through contraction. This process causes Jupiter to shrink by about 1 mm (0.039 in)/yr. [55] [56] When formed, Jupiter was hotter and was about twice its current diameter. [57]

    Internal structure

    Diagram of Jupiter, its interior, surface features, rings, and inner moons. Jupiter diagram.svg
    Diagram of Jupiter, its interior, surface features, rings, and inner moons.

    Before the early 21st century, most scientists expected Jupiter to either consist of a dense core, a surrounding layer of liquid metallic hydrogen (with some helium) extending outward to about 80% of the radius of the planet, [58] and an outer atmosphere consisting predominantly of molecular hydrogen, [56] or perhaps to have no core at all, consisting instead of denser and denser fluid (predominantly molecular and metallic hydrogen) all the way to the center, depending on whether the planet accreted first as a solid body or collapsed directly from the gaseous protoplanetary disk. When the Juno mission arrived in July 2016, [19] it found that Jupiter has a very diffuse core that mixes into its mantle. [59] [60] A possible cause is an impact from a planet of about ten Earth masses a few million years after Jupiter's formation, which would have disrupted an originally solid Jovian core. [61] [62] It is estimated that the core is 30–50% of the planet's radius, and contains heavy elements 7–25 times the mass of Earth. [63]

    Above the layer of metallic hydrogen lies a transparent interior atmosphere of hydrogen. At this depth, the pressure and temperature are above molecular hydrogen's critical pressure of 1.3 MPa and critical temperature of only 33  K (−240.2  °C ; −400.3  °F ). [64] In this state, there are no distinct liquid and gas phases—hydrogen is said to be in a supercritical fluid state. It is convenient to treat hydrogen as gas extending downward from the cloud layer to a depth of about 1,000  km (620  mi ), [54] and as liquid in deeper layers, possibly resembling something akin to an ocean of liquid hydrogen and other supercritical fluids. [65] [66] [67]

    Physically, there is no clear boundary—the gas smoothly becomes hotter and denser as depth increases. [68] [69] Rain-like droplets of helium and neon precipitate downward through the lower atmosphere, depleting the abundance of these elements in the upper atmosphere. [42] [70] Calculations suggest that helium drops separate from metallic hydrogen at a radius of 60,000 km (37,000 mi) (11,000 km (6,800 mi) below the cloudtops) and merge again at 50,000 km (31,000 mi) (22,000 km (14,000 mi) beneath the clouds). [71] Rainfalls of diamonds have been suggested to occur, as well as on Saturn [72] and the ice giants Uranus and Neptune. [73]

    The temperature and pressure inside Jupiter increase steadily inward, this is observed in microwave emission and required because the heat of formation can only escape by convection. At the pressure level of 10  bars (1 MPa), the temperature is around 340 K (67 °C; 152 °F). The hydrogen is always supercritical (that is, it never encounters a first-order phase transition) even as it changes gradually from a molecular fluid to a metallic fluid at around 100–200 GPa, where the temperature is perhaps 5,000 K (4,730 °C; 8,540 °F). The temperature of Jupiter's diluted core is estimated at around 20,000 K (19,700 °C; 35,500 °F) or more with an estimated pressure of around 4,500 GPa. [74]


    Jupiter has the deepest planetary atmosphere in the Solar System, spanning over 5,000 km (3,000 mi) in altitude. [75] [76]

    Cloud layers

    Map of Jupiter.jpg
    South polar view of Jupiter
    Enhanced color view of Jupiter's southern storms

    Jupiter is perpetually covered with clouds composed of ammonia crystals, and possibly ammonium hydrosulfide. The clouds are in the tropopause and are in bands of different latitudes, known as tropical regions. These are subdivided into lighter-hued zones and darker belts. The interactions of these conflicting circulation patterns cause storms and turbulence. Wind speeds of 100 metres per second (360 km/h; 220 mph) are common in zonal jet streams. [77] The zones have been observed to vary in width, colour and intensity from year to year, but they have remained sufficiently stable for scientists to name them. [45]

    The cloud layer is about 50 km (31 mi) deep, and consists of at least two decks of clouds: a thick lower deck and a thin clearer region. There may also be a thin layer of water clouds underlying the ammonia layer. Supporting the presence of water clouds are the flashes of lightning detected in the atmosphere of Jupiter. These electrical discharges can be up to a thousand times as powerful as lightning on Earth. [78] The water clouds are assumed to generate thunderstorms in the same way as terrestrial thunderstorms, driven by the heat rising from the interior. [79] The Juno mission revealed the presence of "shallow lightning" which originates from ammonia-water clouds relatively high in the atmosphere. [80] These discharges carry "mushballs" of water-ammonia slushes covered in ice, which fall deep into the atmosphere. [81] Upper-atmospheric lightning has been observed in Jupiter's upper atmosphere, bright flashes of light that last around 1.4 milliseconds. These are known as "elves" or "sprites" and appear blue or pink due to the hydrogen. [82] [83]

    Time-lapse sequence from the approach of Voyager 1, showing the motion of atmospheric bands and circulation of the Great Red Spot. Recorded over 32 days with one photograph taken every 10 hours (once per Jovian day). See full size video. 790106-0203 Voyager 58M to 31M reduced.gif
    Time-lapse sequence from the approach of Voyager 1, showing the motion of atmospheric bands and circulation of the Great Red Spot. Recorded over 32 days with one photograph taken every 10 hours (once per Jovian day). See full size video.

    The orange and brown colours in the clouds of Jupiter are caused by upwelling compounds that change colour when they are exposed to ultraviolet light from the Sun. The exact makeup remains uncertain, but the substances are thought to be phosphorus, sulfur or possibly hydrocarbons. [54] [84] These colourful compounds, known as chromophores, mix with the warmer lower deck of clouds. The zones are formed when rising convection cells form crystallising ammonia that masks out these lower clouds from view. [85]

    Jupiter's low axial tilt means that the poles always receive less solar radiation than the planet's equatorial region. Convection within the interior of the planet transports energy to the poles, balancing out the temperatures at the cloud layer. [45]

    Great Red Spot and other vortices

    The best known feature of Jupiter is the Great Red Spot, [86] a persistent anticyclonic storm located 22° south of the equator. It is known to have existed since at least 1831, [87] and possibly since 1665. [88] [89] Images by the Hubble Space Telescope have shown as many as two "red spots" adjacent to the Great Red Spot. [90] [91] The storm is visible through Earth-based telescopes with an aperture of 12 cm or larger. [92] The oval object rotates counterclockwise, with a period of about six days. [93] The maximum altitude of this storm is about 8 km (5 mi) above the surrounding cloudtops. [94] The Spot's composition and the source of its red color remain uncertain, although photodissociated ammonia reacting with acetylene is a robust candidate to explain the coloration. [95]

    Close up of The Great Red Spot, Taken by the Juno spacecraft, in April 2018. Jupiters iconic Great Red Spot.jpg
    Close up of The Great Red Spot, Taken by the Juno spacecraft, in April 2018.

    The Great Red Spot is larger than the Earth. [96] Mathematical models suggest that the storm is stable and will be a permanent feature of the planet. [97] However, it has significantly decreased in size since its discovery. Initial observations in the late 1800s showed it to be approximately 41,000 km (25,500 mi) across. By the time of the Voyager flybys in 1979, the storm had a length of 23,300 km (14,500 mi) and a width of approximately 13,000 km (8,000 mi). [98] Hubble observations in 1995 showed it had decreased in size to 20,950 km (13,020 mi), and observations in 2009 showed the size to be 17,910 km (11,130 mi). As of 2015, the storm was measured at approximately 16,500 by 10,940 km (10,250 by 6,800 mi), [98] and was decreasing in length by about 930 km (580 mi) per year. [96] [99] In October 2021, a Juno flyby mission utilized two scientific instruments to measure the depth of the Great Red Spot putting it at around 300 - 500 km (186 -310 miles) deep. [100]

    Juno missions show that there are several polar cyclone groups at Jupiter's poles. The northern group contains nine cyclones, with a large one in the center and eight others around it, while its southern counterpart also consists of a center vortex but is surrounded by five large storms and a single smaller one. [101] [ better source needed ] These polar structures are caused by the turbulence in Jupiter's atmosphere and can be compared with the hexagon at Saturn's north pole.

    The Great Red Spot is decreasing in size (May 15, 2014) NASA14135-Jupiter-GreatRedSpot-Shrinks-20140515.jpg
    The Great Red Spot is decreasing in size (May 15, 2014)

    In 2000, an atmospheric feature formed in the southern hemisphere that is similar in appearance to the Great Red Spot, but smaller. This was created when smaller, white oval-shaped storms merged to form a single feature—these three smaller white ovals were first observed in 1938. The merged feature was named Oval BA and has been nicknamed "Red Spot Junior." It has since increased in intensity and changed from white to red. [103] [104] [105]

    In April 2017, a "Great Cold Spot" was discovered in Jupiter's thermosphere at its north pole. This feature is 24,000 km (15,000 mi) across, 12,000 km (7,500 mi) wide, and 200 °C (360 °F) cooler than surrounding material. While this spot changes form and intensity over the short term, it has maintained its general position in the atmosphere for more than 15 years. It may be a giant vortex similar to the Great Red Spot, and appears to be quasi-stable like the vortices in Earth's thermosphere. Interactions between charged particles generated from Io and the planet's strong magnetic field likely resulted in redistribution of heat flow, forming the Spot. [106]


    Aurorae on the north and south poles
    Hubble Captures Vivid Auroras in Jupiter's Atmosphere.jpg
    Aurorae on the north pole
    PIA21033 Juno's View of Jupiter's Southern Lights.jpg
    Infrared view of southern lights
    (Jovian IR Mapper)

    Jupiter's magnetic field is fourteen times stronger than Earth's, ranging from 4.2  gauss (0.42 mT) at the equator to 10–14 gauss (1.0–1.4 mT) at the poles, making it the strongest in the Solar System (except for sunspots). [85] This field is thought to be generated by eddy currents—swirling movements of conducting materials—within the liquid metallic hydrogen core. The volcanoes on the moon Io emit large amounts of sulfur dioxide, forming a gas torus along the moon's orbit. The gas is ionised in the magnetosphere, producing sulfur and oxygen ions. They, together with hydrogen ions originating from the atmosphere of Jupiter, form a plasma sheet in Jupiter's equatorial plane. The plasma in the sheet co-rotates with the planet, causing deformation of the dipole magnetic field into that of a magnetodisk. Electrons within the plasma sheet generate a strong radio signature that produces bursts in the range of 0.6–30  MHz which are detectable from Earth with consumer-grade shortwave radio receivers. [107] [108]

    At about 75 Jupiter radii from the planet, the interaction of the magnetosphere with the solar wind generates a bow shock. Surrounding Jupiter's magnetosphere is a magnetopause, located at the inner edge of a magnetosheath—a region between it and the bow shock. The solar wind interacts with these regions, elongating the magnetosphere on Jupiter's lee side and extending it outward until it nearly reaches the orbit of Saturn. The four largest moons of Jupiter all orbit within the magnetosphere, which protects them from the solar wind. [54]

    The magnetosphere of Jupiter is responsible for intense episodes of radio emission from the planet's polar regions. Volcanic activity on Jupiter's moon Io injects gas into Jupiter's magnetosphere, producing a torus of particles about the planet. As Io moves through this torus, the interaction generates Alfvén waves that carry ionised matter into the polar regions of Jupiter. As a result, radio waves are generated through a cyclotron maser mechanism, and the energy is transmitted out along a cone-shaped surface. When Earth intersects this cone, the radio emissions from Jupiter can exceed the solar radio output. [109]

    Orbit and rotation

    Jupiter (red) completes one orbit of the Sun (centre) for every 11.86 orbits by Earth (blue) Solarsystem3DJupiter.gif
    Jupiter (red) completes one orbit of the Sun (centre) for every 11.86 orbits by Earth (blue)
    A rotation time-lapse of Jupiter over 3 hours Jupiter rotation over 3 hours with 11 inch telescope.gif
    A rotation time-lapse of Jupiter over 3 hours

    Jupiter is the only planet whose barycentre with the Sun lies outside the volume of the Sun, though by only 7% of the Sun's radius. [110] The average distance between Jupiter and the Sun is 778 million km (about 5.2 times the average distance between Earth and the Sun, or 5.2 AU) and it completes an orbit every 11.86 years. This is approximately two-fifths the orbital period of Saturn, forming a near orbital resonance. [111] The orbital plane of Jupiter is inclined 1.31° compared to Earth. Because the eccentricity of its orbit is 0.048, Jupiter is slightly over 75 million km nearer the Sun at perihelion than aphelion. [2]

    The axial tilt of Jupiter is relatively small, only 3.13°, so its seasons are insignificant compared to those of Earth and Mars. [112]

    Jupiter's rotation is the fastest of all the Solar System's planets, completing a rotation on its axis in slightly less than ten hours; this creates an equatorial bulge easily seen through an amateur telescope. The planet is an oblate spheroid, meaning that the diameter across its equator is longer than the diameter measured between its poles. On Jupiter, the equatorial diameter is 9,275 km (5,763 mi) longer than the polar diameter. [69]

    Because Jupiter is not a solid body, its upper atmosphere undergoes differential rotation. The rotation of Jupiter's polar atmosphere is about 5 minutes longer than that of the equatorial atmosphere; three systems are used as frames of reference, particularly when graphing the motion of atmospheric features. System I applies to latitudes from 10° N to 10° S; its period is the planet's shortest, at 9h 50m 30.0s. System II applies at all latitudes north and south of these; its period is 9h 55m 40.6s. System III was defined by radio astronomers and corresponds to the rotation of the planet's magnetosphere; its period is Jupiter's official rotation. [113]


    Conjunction of Jupiter and Moon 2019.03.27.jpg
    Conjunction of Jupiter and the Moon
    The retrograde motion of an outer planet is caused by its relative location with respect to Earth

    Jupiter is usually the fourth brightest object in the sky (after the Sun, the Moon, and Venus); [85] at opposition Mars can appear brighter than Jupiter. Depending on Jupiter's position with respect to the Earth, it can vary in visual magnitude from as bright as −2.94 [14] at opposition down to [14] −1.66 during conjunction with the Sun. The mean apparent magnitude is −2.20 with a standard deviation of 0.33. [14] The angular diameter of Jupiter likewise varies from 50.1 to 29.8 arc seconds. [2] Favorable oppositions occur when Jupiter is passing through perihelion, an event that occurs once per orbit. [114]

    Because the orbit of Jupiter is outside that of Earth, the phase angle of Jupiter as viewed from Earth never exceeds 11.5°; thus, Jupiter always appears nearly fully illuminated when viewed through Earth-based telescopes. It was only during spacecraft missions to Jupiter that crescent views of the planet were obtained. [115] A small telescope will usually show Jupiter's four Galilean moons and the prominent cloud belts across Jupiter's atmosphere. [116] A large telescope will show Jupiter's Great Red Spot when it faces Earth. [117]

    History of research and exploration

    Pre-telescopic research

    Model in the Almagest of the longitudinal motion of Jupiter () relative to Earth () Almagest-planets.svg
    Model in the Almagest of the longitudinal motion of Jupiter (☉) relative to Earth (🜨)

    Observation of Jupiter dates back to at least the Babylonian astronomers of the 7th or 8th century BC. [118] The ancient Chinese knew Jupiter as the "Suì Star" (Suìxīng 歲星 ) and established their cycle of 12 earthly branches based on its approximate number of years; the Chinese language still uses its name (simplified as ) when referring to years of age. By the 4th century BC, these observations had developed into the Chinese zodiac, [119] with each year associated with a Tai Sui star and god controlling the region of the heavens opposite Jupiter's position in the night sky; these beliefs survive in some Taoist religious practices and in the East Asian zodiac's twelve animals, now often popularly assumed to be related to the arrival of the animals before Buddha. The Chinese historian Xi Zezong has claimed that Gan De, an ancient Chinese astronomer, reported a small star "in alliance" with the planet, [120] which may indicate a sighting of one of Jupiter's moons with the unaided eye. If true, this would predate Galileo's discovery by nearly two millennia. [121] [122]

    A 2016 paper reports that trapezoidal rule was used by Babylonians before 50 BCE for integrating the velocity of Jupiter along the ecliptic. [123] In his 2nd century work the Almagest , the Hellenistic astronomer Claudius Ptolemaeus constructed a geocentric planetary model based on deferents and epicycles to explain Jupiter's motion relative to Earth, giving its orbital period around Earth as 4332.38 days, or 11.86 years. [124]

    Ground-based telescope research

    Galileo Galilei, discoverer of the four largest moons of Jupiter, now known as Galilean moons Galileo.arp.300pix.jpg
    Galileo Galilei, discoverer of the four largest moons of Jupiter, now known as Galilean moons

    In 1610, Italian polymath Galileo Galilei discovered the four largest moons of Jupiter (now known as the Galilean moons) using a telescope; thought to be the first telescopic observation of moons other than Earth's. One day after Galileo, Simon Marius independently discovered moons around Jupiter, though he did not publish his discovery in a book until 1614. [125] It was Marius's names for the major moons, however, that stuck: Io, Europa, Ganymede, and Callisto. These findings were the first discovery of celestial motion not apparently centred on Earth. The discovery was a major point in favor of Copernicus' heliocentric theory of the motions of the planets; Galileo's outspoken support of the Copernican theory led to him being tried and condemned by the Inquisition. [126]

    During the 1660s, Giovanni Cassini used a new telescope to discover spots and colourful bands, observe that the planet appeared oblate, and estimate the planet's rotation period. [127] In 1690 Cassini noticed that the atmosphere undergoes differential rotation. [54]

    The Great Red Spot may have been observed as early as 1664 by Robert Hooke and in 1665 by Cassini, although this is disputed. The pharmacist Heinrich Schwabe produced the earliest known drawing to show details of the Great Red Spot in 1831. [128] The Red Spot was reportedly lost from sight on several occasions between 1665 and 1708 before becoming quite conspicuous in 1878. It was recorded as fading again in 1883 and at the start of the 20th century. [129]

    Both Giovanni Borelli and Cassini made careful tables of the motions of Jupiter's moons, allowing predictions of when the moons would pass before or behind the planet. By the 1670s, it was observed that when Jupiter was on the opposite side of the Sun from Earth, these events would occur about 17 minutes later than expected. Ole Rømer deduced that light does not travel instantaneously (a conclusion that Cassini had earlier rejected), [40] and this timing discrepancy was used to estimate the speed of light. [130]

    In 1892, E. E. Barnard observed a fifth satellite of Jupiter with the 36-inch (910 mm) refractor at Lick Observatory in California. This moon was later named Amalthea. [131] It was the last planetary moon to be discovered directly by visual observation. [132] An additional eight satellites were discovered before the flyby of the Voyager 1 probe in 1979. [lower-alpha 4]

    Infrared image of Jupiter taken by ESO's Very Large Telescope Jupiter MAD.jpg
    Infrared image of Jupiter taken by ESO's Very Large Telescope

    In 1932, Rupert Wildt identified absorption bands of ammonia and methane in the spectra of Jupiter. [133]

    Three long-lived anticyclonic features termed white ovals were observed in 1938. For several decades they remained as separate features in the atmosphere, sometimes approaching each other but never merging. Finally, two of the ovals merged in 1998, then absorbed the third in 2000, becoming Oval BA. [134]

    Radiotelescope research

    In 1955, Bernard Burke and Kenneth Franklin detected bursts of radio signals coming from Jupiter at 22.2 MHz. [54] The period of these bursts matched the rotation of the planet, and they used this information to refine the rotation rate. Radio bursts from Jupiter were found to come in two forms: long bursts (or L-bursts) lasting up to several seconds, and short bursts (or S-bursts) lasting less than a hundredth of a second. [135]

    Scientists discovered that there are three forms of radio signals transmitted from Jupiter:


    Since 1973, a number of automated spacecraft have visited Jupiter, most notably the Pioneer 10 space probe, the first spacecraft to get close enough to Jupiter to send back revelations about its properties and phenomena. [138] [139] Flights to planets within the Solar System are accomplished at a cost in energy, which is described by the net change in velocity of the spacecraft, or delta-v. Entering a Hohmann transfer orbit from Earth to Jupiter from low Earth orbit requires a delta-v of 6.3 km/s, [140] which is comparable to the 9.7 km/s delta-v needed to reach low Earth orbit. [141] Gravity assists through planetary flybys can be used to reduce the energy required to reach Jupiter, albeit at the cost of a significantly longer flight duration. [142]

    Flyby missions

    Pioneer 10 December 3, 1973130,000 km
    Pioneer 11 December 4, 197434,000 km
    Voyager 1 March 5, 1979349,000 km
    Voyager 2 July 9, 1979570,000 km
    Ulysses February 8, 1992 [143] 408,894 km
    February 4, 2004 [143] 120,000,000 km
    Cassini December 30, 200010,000,000 km
    New Horizons February 28, 20072,304,535 km

    Beginning in 1973, several spacecraft have performed planetary flyby maneuvers that brought them within observation range of Jupiter. The Pioneer missions obtained the first close-up images of Jupiter's atmosphere and several of its moons. They discovered that the radiation fields near the planet were much stronger than expected, but both spacecraft managed to survive in that environment. The trajectories of these spacecraft were used to refine the mass estimates of the Jovian system. Radio occultations by the planet resulted in better measurements of Jupiter's diameter and the amount of polar flattening. [45] [144]

    Six years later, the Voyager missions vastly improved the understanding of the Galilean moons and discovered Jupiter's rings. They also confirmed that the Great Red Spot was anticyclonic. Comparison of images showed that the Red Spot had changed hue since the Pioneer missions, turning from orange to dark brown. A torus of ionised atoms was discovered along Io's orbital path, and volcanoes were found on the moon's surface, some in the process of erupting. As the spacecraft passed behind the planet, it observed flashes of lightning in the night side atmosphere. [45] [145]

    The next mission to encounter Jupiter was the Ulysses solar probe. In February 1992, it performed a flyby maneuver to attain a polar orbit around the Sun. During this pass, the spacecraft studied Jupiter's magnetosphere. Ulysses has no cameras so no images were taken. A second flyby six years later was at a much greater distance. [143]

    In 2000, the Cassini probe flew by Jupiter on its way to Saturn, and provided higher-resolution images. [146]

    The New Horizons probe flew by Jupiter in 2007 for a gravity assist en route to Pluto. [147] The probe's cameras measured plasma output from volcanoes on Io and studied all four Galilean moons in detail, as well as making long-distance observations of the outer moons Himalia and Elara. [148]

    Galileo mission

    Jupiter as seen by the space probe Cassini Portrait of Jupiter from Cassini.jpg
    Jupiter as seen by the space probe Cassini

    The first spacecraft to orbit Jupiter was the Galileo probe, which entered orbit on December 7, 1995. [50] It orbited the planet for over seven years, conducting multiple flybys of all the Galilean moons and Amalthea. The spacecraft also witnessed the impact of Comet Shoemaker–Levy 9 as it approached Jupiter in 1994, giving a unique vantage point for the event. Its originally designed capacity was limited by the failed deployment of its high-gain radio antenna, although extensive information was still gained about the Jovian system from Galileo. [149]

    A 340-kilogram titanium atmospheric probe was released from the spacecraft in July 1995, entering Jupiter's atmosphere on December 7. [50] It parachuted through 150 km (93 mi) of the atmosphere at a speed of about 2,575 km/h (1600 mph) [50] and collected data for 57.6 minutes before the signal was lost at a pressure of about 23 atmospheres and a temperature of 153 °C. [150] It melted thereafter, and possibly vapourised. The Galileo orbiter itself experienced a more rapid version of the same fate when it was deliberately steered into the planet on September 21, 2003, at a speed of over 50 km/s to avoid any possibility of it crashing into and possibly contaminating the moon Europa, which may harbor life. [149]

    Data from this mission revealed that hydrogen composes up to 90% of Jupiter's atmosphere. [50] The recorded temperature was more than 300 °C (570 °F) and the windspeed measured more than 644 km/h (>400 mph) before the probes vapourised. [50]

    Juno mission

    A photograph of Jupiter taken by the Juno spacecraft, at the end of a close flyby
(September 2018) PIA22690 - Jupiter in the Rearview Mirror (panorama).jpg
    A photograph of Jupiter taken by the Juno spacecraft, at the end of a close flyby
    (September 2018)
    Jupiter, as seen by the Juno spacecraft
(February 12, 2019) PIA22946-Jupiter-RedSpot-JunoSpacecraft-20190212.jpg
    Jupiter, as seen by the Juno spacecraft
    (February 12, 2019)

    NASA's Juno mission arrived at Jupiter on July 4, 2016, and was expected to complete thirty-seven orbits over the next twenty months. [19] The mission plan called for Juno to study the planet in detail from a polar orbit. [151] On August 27, 2016, the spacecraft completed its first fly-by of Jupiter and sent back the first ever images of Jupiter's north pole. [152]

    Juno would complete 12 science orbits before the end of its budgeted mission plan, ending July 2018. [153] In June of that year, NASA extended the mission operations plan to July 2021, and in January of that year the mission was extended to September 2025 with four lunar flybys: one of Ganymede, one of Europa, and two of Io. [154] [155] When Juno reaches the end of the mission, it will perform a controlled deorbit and disintegrate into Jupiter's atmosphere. During the mission, the spacecraft will be exposed to high levels of radiation from Jupiter's magnetosphere, which may cause future failure of certain instruments and risk collision with Jupiter's moons. [156] [157]

    Canceled missions and future plans

    There has been great interest in studying Jupiter's icy moons in detail because of the possibility of subsurface liquid oceans on Europa, Ganymede, and Callisto. Funding difficulties have delayed progress. NASA's JIMO (Jupiter Icy Moons Orbiter) was cancelled in 2005. [158] A subsequent proposal was developed for a joint NASA/ESA mission called EJSM/Laplace, with a provisional launch date around 2020. EJSM/Laplace would have consisted of the NASA-led Jupiter Europa Orbiter and the ESA-led Jupiter Ganymede Orbiter. [159] However, ESA had formally ended the partnership by April 2011, citing budget issues at NASA and the consequences on the mission timetable. Instead, ESA planned to go ahead with a European-only mission to compete in its L1 Cosmic Vision selection. [160] These plans were realized as the European Space Agency's Jupiter Icy Moon Explorer (JUICE), due to launch in 2023, [161] followed by NASA's Europa Clipper mission, scheduled for launch in 2024. [162]

    Other proposed missions include the Chinese National Space Administration's Interstellar Express , a pair of probes to launch in 2024 that would use Jupiter's gravity to explore either end of the heliosphere, NASA's Trident , which would launch in 2025 and use Jupiter's gravity to bend the spacecraft on a path to explore Neptune's moon Triton, and CNSA's Gan De mission which aims to launch an orbiter to the Jovian system (and possibly to Callisto) around 2029.


    Jupiter has 80 known natural satellites. [7] [163] Of these, 60 are less than 10 km in diameter. [164] The four largest moons are Io, Europa, Ganymede, and Callisto, collectively known as the "Galilean moons", and are visible from Earth with binoculars on a clear night. [165]

    Galilean moons

    The moons discovered by Galileo—Io, Europa, Ganymede, and Callisto—are among the largest in the Solar System. The orbits of three of them (Io, Europa, and Ganymede) form a pattern known as a Laplace resonance; for every four orbits that Io makes around Jupiter, Europa makes exactly two orbits and Ganymede makes exactly one. This resonance causes the gravitational effects of the three large moons to distort their orbits into elliptical shapes, because each moon receives an extra tug from its neighbors at the same point in every orbit it makes. The tidal force from Jupiter, on the other hand, works to circularise their orbits. [166]

    The eccentricity of their orbits causes regular flexing of the three moons' shapes, with Jupiter's gravity stretching them out as they approach it and allowing them to spring back to more spherical shapes as they swing away. This tidal flexing heats the moons' interiors by friction. [167] This is seen most dramatically in the volcanic activity of Io (which is subject to the strongest tidal forces), [167] and to a lesser degree in the geological youth of Europa's surface, which indicates recent resurfacing of the moon's exterior. [168]

    The Galilean moons, compared to Earth's Moon
    Name IPA DiameterMassOrbital radiusOrbital period
    km %kg %km %days %
    Io /ˈaɪ.oʊ/3,6431058.9×1022120421,7001101.777
    Europa /jʊˈroʊpə/3,122904.8×102265671,0341753.5513
    Ganymede /ˈɡænimiːd/5,26215014.8×10222001,070,4122807.1526
    Callisto /kəˈlɪstoʊ/4,82114010.8×10221501,882,70949016.6961
    The Galilean moons. From left to right, in order of increasing distance from Jupiter: Io, Europa, Ganymede, Callisto. The Galilean satellites (the four largest moons of Jupiter).tif
    The Galilean moons. From left to right, in order of increasing distance from Jupiter: Io, Europa, Ganymede, Callisto.
    The Galilean moons Io, Europa, Ganymede, and Callisto (in order of increasing distance from Jupiter)


    Jupiter's moons were traditionally classified into four groups of four, based on commonality of their orbital elements. [169] This picture has been complicated by the discovery of numerous small outer moons since 1999. Jupiter's moons are currently divided into several different groups, although there are several moons which are not part of any group. [170]

    The eight innermost regular moons, which have nearly circular orbits near the plane of Jupiter's equator, are thought to have formed alongside Jupiter, whilst the remainder are irregular moons and are thought to be captured asteroids or fragments of captured asteroids. Irregular moons that belong to a group share similar orbital elements and thus may have a common origin, perhaps as a larger moon or captured body that broke up. [171] [172]

    Regular moons
    Inner group The inner group of four small moons all have diameters of less than 200 km, orbit at radii less than 200,000 km, and have orbital inclinations of less than half a degree.
    Galilean moons [173] These four moons, discovered by Galileo Galilei and by Simon Marius in parallel, orbit between 400,000 and 2,000,000 km, and are some of the largest moons in the Solar System.
    Irregular moons
    Himalia group A tightly clustered group of moons with orbits around 11,000,000–12,000,000 km from Jupiter. [174]
    Ananke group This retrograde orbit group has rather indistinct borders, averaging 21,276,000 km from Jupiter with an average inclination of 149 degrees. [172]
    Carme group A fairly distinct retrograde group that averages 23,404,000 km from Jupiter with an average inclination of 165 degrees. [172]
    Pasiphae group A dispersed and only vaguely distinct retrograde group that covers all the outermost moons. [175]

    Planetary rings

    The rings of Jupiter PIA01627 Ringe.jpg
    The rings of Jupiter

    Jupiter has a faint planetary ring system composed of three main segments: an inner torus of particles known as the halo, a relatively bright main ring, and an outer gossamer ring. [176] These rings appear to be made of dust, rather than ice as with Saturn's rings. [54] The main ring is probably made of material ejected from the satellites Adrastea and Metis. Material that would normally fall back to the moon is pulled into Jupiter because of its strong gravitational influence. The orbit of the material veers towards Jupiter and new material is added by additional impacts. [177] In a similar way, the moons Thebe and Amalthea probably produce the two distinct components of the dusty gossamer ring. [177] There is also evidence of a rocky ring strung along Amalthea's orbit which may consist of collisional debris from that moon. [178]

    Interaction with the Solar System

    Diagram showing the Trojan asteroids in Jupiter's orbit, as well as the main asteroid belt InnerSolarSystem-en.png
    Diagram showing the Trojan asteroids in Jupiter's orbit, as well as the main asteroid belt

    Along with the Sun, the gravitational influence of Jupiter has helped shape the Solar System. The orbits of most of the system's planets lie closer to Jupiter's orbital plane than the Sun's equatorial plane (Mercury is the only planet that is closer to the Sun's equator in orbital tilt). The Kirkwood gaps in the asteroid belt are mostly caused by Jupiter, and the planet may have been responsible for the Late Heavy Bombardment event in the inner Solar System's history. [179]

    In addition to its moons, Jupiter's gravitational field controls numerous asteroids that have settled into the regions of the Lagrangian points preceding and following Jupiter in its orbit around the Sun. These are known as the Trojan asteroids, and are divided into Greek and Trojan "camps" to commemorate the Iliad . The first of these, 588 Achilles, was discovered by Max Wolf in 1906; since then more than two thousand have been discovered. [180] The largest is 624 Hektor. [181]

    Most short-period comets belong to the Jupiter family—defined as comets with semi-major axes smaller than Jupiter's. Jupiter family comets are thought to form in the Kuiper belt outside the orbit of Neptune. During close encounters with Jupiter their orbits are perturbed into a smaller period and then circularised by regular gravitational interaction with the Sun and Jupiter. [182]

    Due to the magnitude of Jupiter's mass, the centre of gravity between it and the Sun lies just above the Sun's surface, the only planet in the Solar System for which this is true. [183] [184]


    Hubble image taken on July 23, 2009, showing a blemish about 8,000 km (5,000 mi) long left by the 2009 Jupiter impact event. Hs-2009-23-crop.jpg
    Hubble image taken on July 23, 2009, showing a blemish about 8,000 km (5,000 mi) long left by the 2009 Jupiter impact event.

    Jupiter has been called the Solar System's vacuum cleaner [186] because of its immense gravity well and location near the inner Solar System there are more impacts on Jupiter, such as comets, than on the Solar System's other planets. [187] It was thought that Jupiter partially shielded the inner system from cometary bombardment. [50] However, recent computer simulations suggest that Jupiter does not cause a net decrease in the number of comets that pass through the inner Solar System, as its gravity perturbs their orbits inward roughly as often as it accretes or ejects them. [188] This topic remains controversial among scientists, as some think it draws comets towards Earth from the Kuiper belt while others think that Jupiter protects Earth from the Oort cloud. [189] Jupiter experiences about 200 times more asteroid and comet impacts than Earth. [50]

    In July 1994 the Comet Shoemaker–Levy 9 comet collided with the Jupiter. [190] [191] The event was closely observed by a wide range observatories around the world, including Hubble Space Telescope and Galilio probe. [192] [193] [194] [195] The event was widely covered by media. [196]

    A 1997 survey of early astronomical records and drawings suggested that a certain dark surface feature discovered by astronomer Giovanni Cassini in 1690 may have been an impact scar. The survey initially produced eight more candidate sites as potential impact observations that he and others had recorded between 1664 and 1839. It was later determined, however, that these candidate sites had little or no possibility of being the results of the proposed impacts. [197]


    Jupiter, woodcut from a 1550 edition of Guido Bonatti's Liber Astronomiae Jupiter-bonatti.png
    Jupiter, woodcut from a 1550 edition of Guido Bonatti's Liber Astronomiae

    The planet Jupiter has been known since ancient times. It is visible to the naked eye in the night sky and can occasionally be seen in the daytime when the Sun is low. [198] To the Babylonians, this object represented their god Marduk. They used Jupiter's roughly 12-year orbit along the ecliptic to define the constellations of their zodiac. [45] [199]

    The Romans called it "the star of Jupiter" (Iuppiter Stella), as they believed it to be sacred to the principal god of Roman mythology, whose name comes from the Proto-Indo-European vocative compound *Dyēu-pəter (nominative: * Dyēus-pətēr, meaning "Father Sky-God", or "Father Day-God"). [200] In turn, Jupiter was the counterpart to the mythical Greek Zeus (Ζεύς), also referred to as Dias (Δίας), the planetary name of which is retained in modern Greek. [201] The ancient Greeks knew the planet as Phaethon (Φαέθων), meaning "shining one" or "blazing star". [202] [203] As supreme god of the Roman pantheon, Jupiter was the god of thunder, lightning, and storms, and appropriately called the god of light and sky.

    Jupiter symbol (fixed width).svg

    The original Greek deity Zeus supplies the root zeno-, used to form some Jupiter-related words, such as zenographic . [lower-alpha 5] Jovian is the adjectival form of Jupiter. The older adjectival form jovial, employed by astrologers in the Middle Ages, has come to mean "happy" or "merry", moods ascribed to Jupiter's astrological influence. [204] In Germanic mythology, Jupiter is equated to Thor, whence the English name Thursday for the Roman dies Jovis. [205]

    In Vedic astrology, Hindu astrologers named the planet after Brihaspati, the religious teacher of the gods, and often called it "Guru", which literally means the "Heavy One". [206] In Central Asian Turkic myths, Jupiter is called Erendiz or Erentüz, from eren (of uncertain meaning) and yultuz ("star"). There are many theories about the meaning of eren. These peoples calculated the period of the orbit of Jupiter as 11 years and 300 days. They believed that some social and natural events connected to Erentüz's movements on the sky. [207] The Chinese, Vietnamese, Koreans, and Japanese called it the "wood star" (Chinese :木星; pinyin :mùxīng), based on the Chinese Five Elements. [208] [209] [210]

    See also


    1. This image was taken by the Hubble Space Telescope, using the Wide Field Camera 3, on April 21, 2014. Jupiter's atmosphere and its appearance constantly changes, and hence its current appearance today may not resemble what it was when this image was taken. Depicted in this image, however, are a few features that remain consistent, such as the famous Great Red Spot, featured prominently in the lower right of the image, and the planet's recognizable banded appearance.
    2. 1 2 3 4 5 6 Refers to the level of 1 bar atmospheric pressure
    3. Based on the volume within the level of 1 bar atmospheric pressure
    4. See Moons of Jupiter for details and cites
    5. See for example: "IAUC 2844: Jupiter; 1975h". International Astronomical Union. October 1, 1975. Retrieved October 24, 2010. That particular word has been in use since at least 1966. See: "Query Results from the Astronomy Database". Smithsonian/NASA. Retrieved July 29, 2007.

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    <i>Galileo</i> project Unmanned NASA spacecraft which studied the planet Jupiter and its moons

    Galileo was an American robotic space program that studied the planet Jupiter and its moons, as well as several other Solar System bodies. Named after the Italian astronomer Galileo Galilei, the Galileo spacecraft consisted of an orbiter and an entry probe. It was delivered into Earth orbit on October 18, 1989 by Space ShuttleAtlantis on the STS-34 mission, and arrived at Jupiter on December 7, 1995, after gravitational assist flybys of Venus and Earth, and became the first spacecraft to orbit Jupiter. It launched the first probe into Jupiter, directly measuring its atmosphere. Despite suffering major antenna problems, Galileo achieved the first asteroid flyby, of 951 Gaspra, and discovered the first asteroid moon, Dactyl, around 243 Ida. In 1994, Galileo observed Comet Shoemaker–Levy 9's collision with Jupiter.

    Planet Astronomical object

    A planet is a large astronomical body that is not a star or stellar remnant. There are competing scientific definitions of a 'planet'. In the dynamicist definition adopted by the International Astronomical Union (IAU), a planet is a non-stellar body that is massive enough to be rounded by its own gravity, that directly orbits a star, and that has cleared its orbital zone of competing objects. The IAU has also declared that there are eight planets in the Solar System, independently of the formal definition. In the geological definition used by most planetologists, a planet is a rounded sub-stellar body, possibly a satellite. In addition to the eight Solar planets accepted by the IAU, these include dwarf planets such as Eris and Pluto and planetary-mass moons.

    Solar System The Sun, its planets and their moons

    The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. Of the bodies that orbit the Sun directly, the largest are the four gas and ice giants and the four terrestrial planets, followed by an unknown number of dwarf planets and innumerable small Solar System bodies. Of the bodies that orbit the Sun indirectly—the natural satellites—two are larger than Mercury and one is nearly as large.

    Europa (moon) Smallest Galilean moon of Jupiter

    Europa, or Jupiter II, is the smallest of the four Galilean moons orbiting Jupiter, and the sixth-closest to the planet of all the 80 known moons of Jupiter. It is also the sixth-largest moon in the Solar System. Europa was discovered in 1610 by Galileo Galilei and was named after Europa, the Phoenician mother of King Minos of Crete and lover of Zeus.

    Saturn Planet

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    Ganymede (moon) Largest moon of Jupiter and in the Solar System

    Ganymede, a satellite of Jupiter, is the largest and most massive of the Solar System's moons. The ninth-largest object of the Solar System, it is the largest without a substantial atmosphere. It has a diameter of 5,268 km (3,273 mi), making it 26% larger than the planet Mercury by volume, although it is only 45% as massive. Possessing a metallic core, it has the lowest moment of inertia factor of any solid body in the Solar System and is the only moon known to have a magnetic field. Outward from Jupiter, it is the seventh satellite and the third of the Galilean moons, the first group of objects discovered orbiting another planet. Ganymede orbits Jupiter in roughly seven days and is in a 1:2:4 orbital resonance with the moons Europa and Io, respectively.

    Great Red Spot Persistent storm in Jupiters atmosphere

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    <i>Cassini–Huygens</i> Space research mission sent to the Saturnian system

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    <i>Juno</i> (spacecraft) NASA space probe orbiting the planet Jupiter

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    Neptune Planet

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    Exploration of Io Overview of the exploration of Io, Jupiters innermost Galilean and third-largest moon

    The exploration of Io, Jupiter's innermost Galilean and third-largest moon, began with its discovery in 1610 and continues today with Earth-based observations and visits by spacecraft to the Jupiter system. Italian astronomer Galileo Galilei was the first to record an observation of Io on January 8, 1610, though Simon Marius may have also observed Io at around the same time. During the 17th century, observations of Io and the other Galilean satellites helped with the measurement of longitude by map makers and surveyors, with validation of Kepler's Third Law of planetary motion, and with measurement of the speed of light. Based on ephemerides produced by astronomer Giovanni Cassini and others, Pierre-Simon Laplace created a mathematical theory to explain the resonant orbits of three of Jupiter's moons, Io, Europa, and Ganymede. This resonance was later found to have a profound effect on the geologies of these moons. Improved telescope technology in the late 19th and 20th centuries allowed astronomers to resolve large-scale surface features on Io as well as to estimate its diameter and mass.


    JunoCam is the visible-light camera/telescope onboard NASA's Juno spacecraft currently orbiting Jupiter. The camera is run by the JunoCam Digital Electronics Assembly (JDEA). Both the camera and JDEA were built by Malin Space Science Systems. JunoCam takes a swath of imaging as the spacecraft rotates; the camera is fixed to the spacecraft, so as it rotates, it gets one sweep of observation. It has a field of view of 58 degrees with four filters.

    Jovian Infrared Auroral Mapper

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    Magnetometer (MAG) is an instrument suite on the Juno orbiter for planet Jupiter. The MAG instrument includes both the Fluxgate Magnetometer (FGM) and Advanced Stellar Compass (ASC) instruments. There two sets of MAG instrument suites, and they are both positioned on the far end of three solar panel array booms. Each MAG instrument suite observes the same swath of Jupiter, and by having two sets of instruments, determining what signal is from the planet and what is from spacecraft is supported. Avoiding signals from the spacecraft is another reason MAG is placed at the end of the solar panel boom, about 10 m and 12 m away from the central body of the Juno spacecraft.

    Microwave Radiometer (<i>Juno</i>)

    Microwave Radiometer (MWR) is an instrument on the Juno orbiter sent to planet Jupiter. MWR is a multi-wavelength microwave radiometer for making observations of Jupiter's deep atmosphere. MWR can observe radiation from 1.37 to 50 cm in wavelength, from 600 MHz to 22 GHz in frequencies. This supports its goal of observing the previously unseen atmospheric features and chemical abundances hundreds of miles/km into Jupiter's atmosphere. MWR is designed to detect six different frequencies in that range using separate antennas.


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