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Jupiter
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{{about|the planet|the Roman god|Jupiter (mythology)|other uses}}{{Short description|Fifth planet from the Sun in the Solar System}}{{pp-move-indef}}{{pp-semi-indef}}{{Featured article}}{{Use mdy dates|date=December 2017}}







factoids
740.52AUabbr=unit}}778.57AUabbr=unit}}0.0489}}| inclination =
{{plainlist |


}}| asc_node = 100.464°| arg_peri = 273.867°| mean_anomaly = 20.020°| period =
{{plainlist |
  • {{val|11.862|u=yr}}
  • {{val|fmt=commas|4332.59|u=days}}
  • {{val|fmt=commas|10475.8|u=Jovian solar days}}WEB,weblink Rotation Period and Day Length, Seligman, Courtney, August 13, 2009,


}}
398.88|u=days}}13.07mi/s|abbr=unit}}moons of Jupiter>79 ({{as oflc=y}})FIRST1=P. KENNETH FIRST2=BRENT A. FIRST3=MICHAEL F. LAST4=CONRAD LAST5=CONSOLMAGNO LAST6=HESTROFFER LAST7=HILTON LAST8=KRASINSKY LAST9=NEUMANN LAST10=OBERST LAST11=STOOKE LAST12=TEDESCO LAST13=THOLEN LAST14=THOMAS LAST15=WILLIAMS YEAR=2007 JOURNAL=CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY ISSUE=3 PMID= BIBCODE=2007CEMDA..98..155S, LISSAUER >FIRST2=JACK J. FIRST1=IMKE DATE=2015 PAGE=250 LOCATION=NEW YORK EDITION=2ND UPDATED, 0.06487}}| equatorial_radius =
{hide}plainlist |
  • {{convert|71492|km|mi|0|abbr=unit{edih}Refers to the level of 1 bar atmospheric pressure
  • {{val|11.209|u=Earths}}


}}| polar_radius =
{hide}plainlist |
  • {{convert|66854|km|mi|0|abbr=unit{edih}
  • {{val|10.517|u=Earths}}


}}
69911miabbr=unit}}| surface_area =
{{plainlist |
  • {{convert|6.1419e10|km2|sqmi|abbr=unit}}WEB,weblink Solar System Exploration: Jupiter: Facts & Figures, NASA, May 7, 2008,
  • {{val|121.9|u=Earths}}


}}| volume =
{{plainlist |
  • {{convert|1.4313e15|km3|cumi|abbr=unit}}
  • {{val|fmt=commas|1321|u=Earths}}


}}| mass =
{{plainlist |
  • {{convert|1.8982e27|kg|lb|sigfig=5|abbr=unit}}
  • {{val|317.8|u=Earths}}
  • 1/1047 SunWEB, Astrodynamic Constants, JPL Solar System Dynamics, February 27, 2009,weblink August 8, 2007,


}}
1326lk=on|abbr=unit}}Based on the volume within the level of 1 bar atmospheric pressure24.79lk=ong-force>g0.254|u=I/MR2}} (estimate)59.5mi/s|abbr=unit}}AUTHOR3=BURSA, M. AUTHOR5=DE BURGH, C.AUTHOR7=OBERST, J. AUTHOR9=STANDISH, E.M. AUTHOR11=THOMAS, P.C. URL=HTTP://WWW.HNSKY.ORG/IAU-IAG.HTM JOURNAL=CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY ISSUE=1 ACCESSDATE=FEBRUARY 2, 2007, 2002CeMDA..82...83S, (9 h 55 m 30 s)12.6mi/s km/h|abbr=unit}}| axial_tilt = 3.13° (to orbit)1714}}| declination = 64.495°Bond albedo>Bond)0.538 (geometric)| magnitude = −2.94 to −1.66| angular_size = 29.8″ to 50.1″audio=en-us-Jupiter.oggdÊ’ptPUBLISHER=CLARENDON PRESS LAST1=SIMPSON LAST2=WEINER VOLUME=8 ISBN=0-19-861220-6, Jovian)| temp_name1 = 1 bar level| min_temp_1 =165Clk=on}}| max_temp_1 =| temp_name2 = 0.1 bar| min_temp_2 =112Clk=on}}| max_temp =| atmosphere = yes| atmosphere_ref = Pascal (unit)>kPa;PROBE NEPHELOMETER >JOURNAL=GALILEO MESSENGER ISSUE=6 ACCESSDATE=FEBRUARY 12, 2007 ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20090719111109/HTTP://WWW2.JPL.NASA.GOV/GALILEO/MESSENGER/OLDMESS/2PROBE.HTML DF=MDY-ALL, 70 kPaON THE ATMOSPHERES OF DIffERENT PLANETS >FIRST=ROBIN DATE=OCTOBER 24, 2005 ACCESS-DATE=OCTOBER 14, 2017 ARCHIVE-DATE=OCTOBER 14, 2017 DF=MDY-ALL, 27mi|abbr=unit}}| atmosphere_composition = by volume:{{aligned table|cols=289u=%}} hydrogen ({{chem2>H2}})10u=%}} | helium (He)0.3u=%}} methane ({{chem2>CH4}})0.026u=%}} ammonia ({{chem2>NH3}})0.0028u=%}} | hydrogen deuteride (HD)0.0006u=%}} ethane ({{chem2>C2H6}})0.0004u=%}} water (molecule)>water ({{chem2|H2O}})}}Ices: }}Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a giant planet with a mass one-thousandth that of the Sun, but two-and-a-half times that of all the other planets in the Solar System combined. Jupiter and Saturn are gas giants; the other two giant planets, Uranus and Neptune, are ice giants. Jupiter has been known to astronomers since antiquity.WEB, De Crespigny, Rafe, Emperor Huan and Emperor Ling,weblinkweblink" title="web.archive.org/web/20060907044624weblink">weblink September 7, 2006, Asian studies, Online Publications, May 1, 2012, Xu Huang apparently complained that the astronomy office had failed to give them proper emphasis to the eclipse and to other portents, including the movement of the planet Jupiter (taisui). At his instigation, Chen Shou/Yuan was summoned and questioned, and it was under this pressure that his advice implicated Liang Ji., It is named after the Roman god Jupiter.BOOK, Stuart Ross Taylor, 2001, Solar system evolution: a new perspective : an inquiry into the chemical composition, origin, and evolution of the solar system, 2nd, illus., revised, Cambridge University Press, 978-0-521-64130-2, 208, When viewed from Earth, Jupiter can reach an apparent magnitude of −2.94, bright enough for its reflected light to cast shadows,WEB,weblink Young astronomer captures a shadow cast by Jupiter: Bad Astronomy, Discover (magazine), Discover Blogs, November 18, 2011, May 27, 2013, and making it on average the third-brightest natural object in the night sky after the Moon and Venus.Jupiter is primarily composed of hydrogen with a quarter of its mass being helium, though helium comprises only about a tenth of the number of molecules. It may also have a rocky core of heavier elements,JOURNAL, Saumon, D., Guillot, T., Shock Compression of Deuterium and the Interiors of Jupiter and Saturn, The Astrophysical Journal, 609, 2, 1170–1180, 2004, 2004ApJ...609.1170S, 10.1086/421257, astro-ph/0403393, but like the other giant planets, Jupiter lacks a well-defined solid surface. Because of its rapid rotation, the planet's shape is that of 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, resulting in turbulence and storms along their interacting boundaries. A prominent result is the Great Red Spot, a giant storm that is known to have existed since at least the 17th century when it was first seen by telescope. Surrounding Jupiter is a faint planetary ring system and a powerful magnetosphere. Jupiter has 79 known moons,WEB,weblink The Jupiter Satellite and Moon Page, June 2017, June 13, 2017, 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.Jupiter has been explored on several occasions by robotic spacecraft, most notably during the early Pioneer and Voyager flyby missions and later by the Galileo orbiter. In late February 2007, Jupiter was visited by the New Horizons probe, which used Jupiter's gravity to increase its speed and bend its trajectory en route to Pluto. The latest probe to visit the planet is Juno, which entered into orbit around Jupiter on July 4, 2016.NEW, Chang, Kenneth, NASA’s Juno Spacecraft Enters Jupiter’s Orbit,weblink July 5, 2016, New York Times, July 5, 2016, NEWS, Chang, Kenneth, All Eyes (and Ears) on Jupiter,weblink June 30, 2016, New York Times, July 1, 2016, Future targets for exploration in the Jupiter system include the probable ice-covered liquid ocean of its moon Europa.

Formation and migration

{{See also|Formation and evolution of the Solar System}}
Astronomers have discovered nearly 500 planetary systems with multiple planets. Regularly these systems include a few planets with masses several times greater than Earth's (super-Earths), orbiting closer to their star than Mercury is to the Sun, and sometimes also Jupiter-mass gas giants close to their star. Earth and its neighbor planets may have formed from fragments of planets after collisions with Jupiter destroyed those super-Earths near the Sun. As Jupiter came toward the inner Solar System, in what theorists call the grand tack hypothesis, gravitational tugs and pulls occurred causing a series of collisions between the super-Earths as their orbits began to overlap.JOURNAL,weblink Jupiter's decisive role in the inner Solar System's early evolution, Konstantin Batygin, November 17, 2015, 10.1073/pnas.1423252112, 25831540, 4394287, 112, 14, 4214–4217, Proceedings of the National Academy of Sciences, 1503.06945, 2015PNAS..112.4214B, 2015, Researchers from Lund University found that Jupiter's migration went on for around 700,000 years, in a period approximately 2-3 million years after the celestial body started its life as an ice asteroid far from the sun. The journey inwards in the solar system followed a spiraling course in which Jupiter continued to circle around the sun, albeit in an increasingly tight path. The reason behind the actual migration relates to gravitational forces from the surrounding gases in the solar system. WEB,weblink Jupiter's Unknown Journey Revealed, S. Pirani, A. Johansen, B. Bitsch, A.J. Mustill, D. Turrini, 2019-03-22, sciencedaily.com, March 25, 2019, Jupiter moving out of the inner Solar System would have allowed the formation of inner planets, including Earth.WEB,weblink Observe: Jupiter, Wrecking Ball of Early Solar System, Illustration by NASA/JPL-Caltech, 2015-03-24, nationalgeographic.com, November 17, 2015,

Physical characteristics

Jupiter is composed primarily of gaseous and liquid matter. It is the largest of the four giant planets in the Solar System and hence its largest planet. It has a diameter of {{convert|142984|km|0|abbr=on}} at its equator. 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.

Composition

Jupiter's upper atmosphere is about 88–92% hydrogen and 8–12% helium by percent volume of gas molecules. A helium atom has about four times as much mass as a hydrogen atom, so the composition changes when described as the proportion of mass contributed by different atoms. Thus, Jupiter's atmosphere is approximately 75% hydrogen and 24% helium by mass, with the remaining one percent of the mass consisting of other elements. The atmosphere contains trace amounts of methane, water vapor, ammonia, and silicon-based compounds. There are also traces of carbon, ethane, hydrogen sulfide, neon, oxygen, phosphine, and sulfur. The outermost layer of the atmosphere contains crystals of frozen ammonia. The interior contains denser materials—by mass it is roughly 71% hydrogen, 24% helium, and 5% other elements.JOURNAL, Gautier, D., Conrath, B., Flasar, M., Hanel, R., Kunde, V., Chedin, A., Scott N., The helium abundance of Jupiter from Voyager, Journal of Geophysical Research, 86, A10, 8713–8720, 1981, 1981JGR....86.8713G, 10.1029/JA086iA10p08713, 2060/19810016480, JOURNAL, Kunde, V.G., etal, Jupiter's Atmospheric Composition from the Cassini Thermal Infrared Spectroscopy Experiment, Science, September 10, 2004, 305, 5690, 1582–86,weblink April 4, 2007, 10.1126/science.1100240, 15319491, 2004Sci...305.1582K, Through infrared and ultraviolet measurements, trace amounts of benzene and other hydrocarbons have also been found.JOURNAL, Icarus, 64, 2, 233–48, 1985, Infrared Polar Brightening on Jupiter III. Spectrometry from the Voyager 1 IRIS Experiment, 1985Icar...64..233K, Kim, S.J., Caldwell, J., Rivolo, A.R., Wagner, R., 10.1016/0019-1035(85)90201-5, 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.JOURNAL, Niemann, H.B., Atreya, S.K., Carignan, G.R., Donahue, T.M., Haberman, J.A., Harpold, D.N., Hartle, R.E., Hunten, D.M., Kasprzak, W.T., Mahaffy, P.R., Owen, T.C., Spencer, N.W., Way, S.H., The Galileo Probe Mass Spectrometer: Composition of Jupiter's Atmosphere, Science, 1996, 272, 5263, 846–849, 1996Sci...272..846N, 10.1126/science.272.5263.846, 8629016, Helium is also depleted to about 80% of the Sun's helium composition. This depletion is a result of precipitation of these elements into the interior of the planet.JOURNAL, U., von Zahn, D.M., Hunten, G., Lehmacher, Helium in Jupiter's atmosphere: Results from the Galileo probe Helium Interferometer Experiment, Journal of Geophysical Research, 1998, 103, E10, 22815–22829, 10.1029/98JE00695, 1998JGR...10322815V, 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 ices and are thus now termed ice giants.WEB, Ingersoll, A.P., Hammel, H.B., Spilker, T.R., Young, R.E., June 1, 2005, PDF,weblink Outer Planets: The Ice Giants, Lunar & Planetary Institute, February 1, 2007,

Mass and size

File:SolarSystem OrdersOfMagnitude Sun-Jupiter-Earth-Moon.jpg|thumb|left|Jupiter's diameter is one order of magnitudeorder of magnitudeJupiter's mass is 2.5 times that of all the other planets in the Solar System combined—this is so massive that its barycenter with the Sun lies above the Sun's surface at 1.068 solar radii from the Sun's center.BOOK, MacDougal, Douglas W., Newton's Gravity, 2012, Springer New York, 978-1-4614-5443-4, 193–211, en, A Binary System Close to Home: How the Moon and Earth Orbit Each Other, the barycenter is 743,000 km from the center of the sun. The Sun's radius is 696,000 km, so it is 47,000 km above the surface., 10.1007/978-1-4614-5444-1_10, Undergraduate Lecture Notes in Physics, 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.{{page needed|date=May 2015}} BOOK, Eric, Burgess, 1982, By Jupiter: Odysseys to a Giant, Columbia University Press, New York, 978-0-231-05176-7, Jupiter's radius is about 1/10 the radius of the Sun,BOOK, Frank H., Shu, 1982, The physical universe: an introduction to astronomy, 426, Series of books in astronomy, 12th, University Science Books, 978-0-935702-05-7, and its mass is 0.001 times the mass of the Sun, so the densities of the two bodies are similar.BOOK, Davis, Andrew M., Turekian, Karl K., Meteorites, comets, and planets, 1, Treatise on geochemistry, Elsevier, 2005, 978-0-08-044720-9, 624, A "Jupiter mass" ({{Jupiter mass}} or {{Jupiter mass|Jup=y}}) is often used as a unit to describe masses of other objects, particularly extrasolar planets and brown dwarfs. So, for example, the extrasolar planet HD 209458 b has a mass of {{Jupiter mass|0.69}}, while Kappa Andromedae b has a mass of {{Jupiter mass|12.8}}.WEB,weblink The Extrasolar Planets Encyclopedia: Interactive Catalogue, Paris Observatory, Jean Schneider, 2009, Theoretical models indicate that if Jupiter had much more mass than it does at present, it would shrink.JOURNAL, Seager, S., Kuchner, M., Hier-Majumder, C.A., Militzer, B., Mass-Radius Relationships for Solid Exoplanets, The Astrophysical Journal, 669, 2, 1279–1297, 2007, 10.1086/521346, 0707.2895, 2007ApJ...669.1279S, For small changes in mass, the radius would not change appreciably, and above about {{earth mass|link=yes|500}} (1.6 Jupiter masses) 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.AV MEDIA, How the Universe Works 3, Jupiter: Destroyer or Savior?, 2014, Discovery Channel, 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.JOURNAL, Guillot, Tristan, Interiors of Giant Planets Inside and Outside the Solar System, Science, 1999, 286, 5437, 72–77, August 28, 2007,weblink 10.1126/science.286.5437.72, 10506563, 1999Sci...286...72G, Although Jupiter would need to be about 75 times as massive to fuse hydrogen and become a star, the smallest red dwarf is only about 30 percent larger in radius than Jupiter.JOURNAL, Burrows, A., Hubbard, W.B., Saumon, D., Lunine, J.I., An expanded set of brown dwarf and very low mass star models, Astrophysical Journal, 1993, 406, 1, 158–71, 1993ApJ...406..158B, 10.1086/172427, NEWS, Didier, Queloz, VLT Interferometer Measures the Size of Proxima Centauri and Other Nearby Stars, European Southern Observatory, November 19, 2002,weblink January 12, 2007, 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.{{page needed|date=May 2015}} BOOK, Linda T., Elkins-Tanton, 2006, Jupiter and Saturn, Chelsea House, New York, 978-0-8160-5196-0, This additional heat is generated by the Kelvin–Helmholtz mechanism through contraction. This process causes Jupiter to shrink by about 2 cm each year.BOOK, Bagenal, F., Dowling, T.E., McKinnon, W.B., Guillot, T., Stevenson, D.J., Hubbard, W.B., Saumon, D., 2004, Jupiter: The Planet, Satellites and Magnetosphere, Chapter 3: The Interior of Jupiter, Cambridge University Press, 978-0-521-81808-7, When it was first formed, Jupiter was much hotter and was about twice its current diameter.JOURNAL, Bodenheimer, P., Calculations of the early evolution of Jupiter, 23, Icarus, 1974, 3, 23, 319–25, 1974Icar...23..319B, 10.1016/0019-1035(74)90050-5,

Internal structure

Jupiter is thought to consist of a dense core with a mixture of elements, a surrounding layer of liquid metallic hydrogen with some helium, and an outer layer predominantly of molecular hydrogen. Beyond this basic outline, there is still considerable uncertainty. The core is often described as rocky, but its detailed composition is unknown, as are the properties of materials at the temperatures and pressures of those depths (see below). In 1997, the existence of the core was suggested by gravitational measurements, indicating a mass of from 12 to 45 times that of Earth, or roughly 4%–14% of the total mass of Jupiter.JOURNAL, Guillot, T., Gautier, D., Hubbard, W.B., New Constraints on the Composition of Jupiter from Galileo Measurements and Interior Models, Icarus, 1997, 130, 2, 534–539, 1997Icar..130..534G, 10.1006/icar.1997.5812, astro-ph/9707210,weblink The presence of a core during at least part of Jupiter's history is suggested by models of planetary formation that require the formation of a rocky or icy core massive enough to collect its bulk of hydrogen and helium from the protosolar nebula. Assuming it did exist, it may have shrunk as convection currents of hot liquid metallic hydrogen mixed with the molten core and carried its contents to higher levels in the planetary interior. A core may now be entirely absent, as gravitational measurements are not yet precise enough to rule that possibility out entirely.BOOK, Various, McFadden, Lucy-Ann, Weissman, Paul, Johnson, Torrence, 2006, Encyclopedia of the Solar System, 2nd, Academic Press, 978-0-12-088589-3, 412, File:PIA19640-Jupiter-Infrared-Animation-20150516.gif|thumb|upright|Animation of four images showing Jupiter in infrared light as seen by NASA's Infrared telescope facility on May 16, 2015]]The uncertainty of the models is tied to the error margin in hitherto measured parameters: one of the rotational coefficients (J6) used to describe the planet's gravitational moment, Jupiter's equatorial radius, and its temperature at 1 bar pressure. The Juno mission, which arrived in July 2016, is expected to further constrain the values of these parameters for better models of the core.JOURNAL, Horia, Yasunori, Sanoa, Takayoshi, Ikomaa, Masahiro, Idaa, Shigeru, On uncertainty of Jupiter's core mass due to observational errors, Proceedings of the International Astronomical Union, 2007, 3, S249, 10.1017/S1743921308016554, 163–166, 2008IAUS..249..163H, The core region may be surrounded by dense metallic hydrogen, which extends outward to about 78% of the radius of the planet. Rain-like droplets of helium and neon precipitate downward through this layer, depleting the abundance of these elements in the upper atmosphere.JOURNAL, Lodders, Katharina, Jupiter Formed with More Tar than Ice, The Astrophysical Journal, 2004, 611, 1, 587–597, 10.1086/421970, 2004ApJ...611..587L, Rainfalls of diamonds have been suggested to occur on Jupiter, as well as on SaturnNEWS, Kramer, Miriam, Diamond Rain May Fill Skies of Jupiter and Saturn,weblink October 9, 2013, Space.com, August 27, 2017, and ice giants Uranus and Neptune.NEWS, Kaplan, Sarah, It rains solid diamonds on Uranus and Neptune,weblink August 25, 2017, The Washington Post, August 27, 2017, Above the layer of metallic hydrogen lies a transparent interior atmosphere of hydrogen. At this depth, the pressure and temperature are above hydrogen's critical pressure of 1.2858 MPa and critical temperature of only 32.938 K.JOURNAL, Andreas, Züttel, September 2003, Materials for hydrogen storage, Materials Today, 6, 9, 24–33, 10.1016/S1369-7021(03)00922-2, 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 in the upper layer extending downward from the cloud layer to a depth of about 1,000 km, and as liquid in deeper layers. Physically, there is no clear boundary—the gas smoothly becomes hotter and denser as one descends.JOURNAL, Guillot, T., A comparison of the interiors of Jupiter and Saturn, Planetary and Space Science, 1999, 47, 10–11, 1183–200, 1999P&SS...47.1183G, astro-ph/9907402, 10.1016/S0032-0633(99)00043-4,weblink WEB, Lang, Kenneth R., 2003,weblink Jupiter: a giant primitive planet, NASA, January 10, 2007, The temperature and pressure inside Jupiter increase steadily toward the core, due to the Kelvin–Helmholtz mechanism. At the pressure level of 10 bars (1 MPa), the temperature is around {{convert|340|K|C F}}. At the phase transition region where hydrogen—heated beyond its critical point—becomes metallic, it is calculated the temperature is {{convert|10,000|K|C F}} and the pressure is 200 GPa. The temperature at the core boundary is estimated to be {{convert|36,000|K|C F}} and the interior pressure is roughly 3,000–4,500 GPa.File:Jupiter diagram.svg|thumb|720px|center|This cut-away illustrates a model of the interior of Jupiter, with a rocky core overlaid by a deep layer of liquid alt=Diagram of Jupiter's moons, surface, and interior

Atmosphere

Jupiter has the largest planetary atmosphere in the Solar System, spanning over {{convert|5000|km|-3|abbr=on}} in altitude.JOURNAL, Seiff, A., Kirk, D.B., Knight, T.C.D., 3, Young, R.E., Mihalov, J.D., Young, L.A., Milos, F.S., Schubert, G., Blanchard, R.C., Atkinson, D., 1998, Thermal structure of Jupiter's atmosphere near the edge of a 5-μm hot spot in the north equatorial belt, Journal of Geophysical Research, 103, E10, 22857–22889, 10.1029/98JE01766, 1998JGR...10322857S, Because Jupiter has no surface, the base of its atmosphere is usually considered to be the point at which atmospheric pressure is equal to {{convert|100|kPa|bar|abbr=on}}.

Cloud layers

File:PIA02863 - Jupiter surface motion animation.gif|thumb|left|150px|The movement of Jupiter's counter-rotating cloud bands. This looping animation maps the planet's exterior onto a cylindrical projectioncylindrical projection{{multiple image |align=right |direction=horizontal |total_width=350
|image1=Map of Jupiter.jpg |width1=2231 |height1=2266 |caption1=South polar view of Jupiter
|image2=PIA21641-Jupiter-SouthernStorms-JunoCam-20170525.jpg |width2=2646 |height2=2915 |caption2=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 located in the tropopause and are arranged into bands of different latitudes, known as tropical regions. These are sub-divided into lighter-hued zones and darker belts. The interactions of these conflicting circulation patterns cause storms and turbulence. Wind speeds of 100 m/s (360 km/h) are common in zonal jets.WEB, Ingersoll, A.P., Dowling, T.E., Gierasch, P.J., Orton, G.S., Read, P.L., Sanchez-Lavega, A., Showman, A.P., Simon-Miller, A.A., Vasavada, A.R.,weblink PDF, Dynamics of Jupiter's Atmosphere, Lunar & Planetary Institute, February 1, 2007, The zones have been observed to vary in width, color and intensity from year to year, but they have remained sufficiently stable for scientists to give them identifying designations.File:PIA21973-AboveTheCloudsOfJupiter-JunoSpacecraft-20171216.jpg|thumb|left|150px|Jupiter clouds(Juno; December 2017)]]The cloud layer is only about {{convert|50|km|0|abbr=on}} 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 idea 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.WEB, Watanabe, Susan, February 25, 2006,weblink Surprising Jupiter: Busy Galileo spacecraft showed jovian system is full of surprises, NASA, February 20, 2007, The water clouds are assumed to generate thunderstorms in the same way as terrestrial thunderstorms, driven by the heat rising from the interior.JOURNAL, Kerr, Richard A., Deep, Moist Heat Drives Jovian Weather, Science, 2000, 287, 5455, 946–947,weblink 10.1126/science.287.5455.946b, February 24, 2007, The orange and brown coloration in the clouds of Jupiter are caused by upwelling compounds that change color 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.CONFERENCE, Strycker, P.D., Chanover, N., Sussman, M., Simon-Miller, A., A Spectroscopic Search for Jupiter's Chromophores, DPS meeting #38, #11.15, American Astronomical Society, 2006, 2006DPS....38.1115S, These colorful compounds, known as chromophores, mix with the warmer, lower deck of clouds. The zones are formed when rising convection cells form crystallizing ammonia that masks out these lower clouds from view.WEB, Gierasch, Peter J., Nicholson, Philip D., 2004,weblinkweblink" title="web.archive.org/web/20050105155019weblink">weblink yes, January 5, 2005, Jupiter, World Book @ NASA, August 10, 2006, Jupiter's low axial tilt means that the poles constantly receive less solar radiation than at the planet's equatorial region. Convection within the interior of the planet transports more energy to the poles, balancing out the temperatures at the cloud layer.

Great Red Spot and other vortices

File:790106-0203 Voyager 58M to 31M reduced.gif|thumb|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 (:File:Jupiter from Voyager 1 PIA02855 max quality.ogv|full size video).]]The best known feature of Jupiter is the Great Red Spot,NEWS, Chang, Kenneth, The Great Red Spot Descends Deep Into Jupiter,weblink December 13, 2017, The New York Times, December 15, 2017, a persistent anticyclonic storm that is larger than Earth, located 22° south of the equator. It is known to have been in existence since at least 1831,JOURNAL, Denning, W.F., Jupiter, early history of the great red spot on, Monthly Notices of the Royal Astronomical Society, 1899, 59, 10, 574–584, 1899MNRAS..59..574D, 10.1093/mnras/59.10.574, and possibly since 1665.JOURNAL, Kyrala, A., An explanation of the persistence of the Great Red Spot of Jupiter, Moon and the Planets, 1982, 26, 1, 105–7, 1982M&P....26..105K, 10.1007/BF00941374, Philosophical Transactions Vol. I (1665–1666.). Project Gutenberg. Retrieved on December 22, 2011. Images by the Hubble Space Telescope have shown as many as two "red spots" adjacent to the Great Red Spot.WEB, New Red Spot Appears on Jupiter,weblink HubbleSite, NASA, December 12, 2013, WEB, Three Red Spots Mix It Up on Jupiter,weblink HubbleSite, NASA, April 26, 2015, The storm is large enough to be visible through Earth-based telescopes with an aperture of 12 cm or larger.BOOK, Michael A., Covington, 2002, Celestial Objects for Modern Telescopes, 53, Cambridge University Press, 978-0-521-52419-3, The oval object rotates counterclockwise, with a period of about six days.WEB, Cardall, C.Y., Daunt, S.J,weblink The Great Red Spot, University of Tennessee, February 2, 2007, The maximum altitude of this storm is about {{convert|8|km|0|abbr=on}} above the surrounding cloudtops.WEB, Tony, Phillips, March 3, 2006,weblink Jupiter's New Red Spot, NASA, February 2, 2007, yes,weblink October 19, 2008, File:NASA14135-Jupiter-GreatRedSpot-Shrinks-20140515.jpg|thumb|left|Great Red Spot is decreasing in size (May 15, 2014).WEB, Harrington, J.D., Weaver, Donna, Villard, Ray, Release 14-135 – NASA's Hubble Shows Jupiter's Great Red Spot is Smaller than Ever Measured,weblink May 15, 2014, NASANASAThe Great Red Spot is large enough to accommodate Earth within its boundaries.NEWS,weblink Is Jupiter's Great Red Spot nearing its twilight?, Space.news, Greg, White, November 25, 2015, April 13, 2017, Mathematical models suggest that the storm is stable and may be a permanent feature of the planet.JOURNAL, Laboratory simulation of Jupiter's Great Red Spot, Jöel, Sommeria, Steven D., Meyers, Harry L., Swinney, Nature, 331, 6158, 689–693, February 25, 1988, 10.1038/331689a0, 1988Natur.331..689S, However, it has significantly decreased in size since its discovery. Initial observations in the late 1800s showed it to be approximately {{convert|25500|mi|km|order=flip|abbr=on}} across. By the time of the Voyager flybys in 1979, the storm had a length of {{convert|14500|mi|km|order=flip|abbr=on}} and a width of approximately {{convert|8000|mi|km|order=flip|abbr=on}}.CONFERENCE, Dramatic Change in Jupiter's Great Red Spot, 46th Lunar and Planetary Science Conference. March 16–20, 2015. The Woodlands, Texas., A.A., Simon, M.H., Wong, J.H., Rogers, G.S., Orton, I., de Pater, X., Asay-Davis, R.W., Carlson, P.S., Marcus, 3, March 2015, 2015LPI....46.1010S, Hubble observations in 1995 showed it had decreased in size again to {{convert|13020|mi|km|order=flip|abbr=on}}, and observations in 2009 showed the size to be {{convert|11130|mi|km|order=flip|abbr=on}}. {{As of|2015}}, the storm was measured at approximately {{convert|10250|by|6800|mi|km|order=flip|abbr=on}}, and is decreasing in length by about {{convert|580|mi|km|order=flip|abbr=on}} per year.NEWS,weblink Jupiter's Superstorm Is Shrinking: Is Changing Red Spot Evidence Of Climate Change?, Tech Times, Rina Marie, Doctor, October 21, 2015, April 13, 2017, Storms such as this are common within the turbulent atmospheres of giant planets. Jupiter also has white ovals and brown ovals, which are lesser unnamed storms. White ovals tend to consist of relatively cool clouds within the upper atmosphere. Brown ovals are warmer and located within the "normal cloud layer". Such storms can last as little as a few hours or stretch on for centuries.Even before Voyager proved that the feature was a storm, there was strong evidence that the spot could not be associated with any deeper feature on the planet's surface, as the Spot rotates differentially with respect to the rest of the atmosphere, sometimes faster and sometimes more slowly. 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 several 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 color from white to red.WEB,weblink Jupiter's New Red Spot, 2006, March 9, 2006, yes,weblink October 19, 2008, WEB, Bill, Steigerwald, October 14, 2006,weblink Jupiter's Little Red Spot Growing Stronger, NASA, February 2, 2007, WEB, Goudarzi, Sara, May 4, 2006,weblink New storm on Jupiter hints at climate changes, USA Today, February 2, 2007, In April 2017, scientists reported the discovery of a "Great Cold Spot" in Jupiter's thermosphere at its north pole that is {{convert|24000|km|mi|abbr=on}} across, {{convert|12000|km|mi|abbr=on}} wide, and {{convert|200|C-change|F-change}} cooler than surrounding material. The feature was discovered by researchers at the Very Large Telescope in Chile, who then searched archived data from the NASA Infrared Telescope Facility between 1995 and 2000. They found that, while the Spot changes size, shape and intensity over the short term, it has maintained its general position in the atmosphere across more than 15 years of available data. Scientists believe the Spot is a giant vortex similar to the Great Red Spot and also 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.JOURNAL, The Great Cold Spot in Jupiter's upper atmosphere, Geophysical Research Letters, Stallard, Tom S., Melin, Henrik, Miller, Steve, Moore, Luke, O'Donoghue, James, Connerney, John E.P., Satoh, Takehiko, West, Robert A., Thayer, Jeffrey P., Hsu, Vicki W., Johnson, Rosie E., 3, 44, 7, 3000–3008, April 10, 2017, 10.1002/2016GL071956, 28603321, 5439487, 2017GeoRL..44.3000S, PRESS RELEASE,weblink ‘Cold’ Great Spot discovered on Jupiter, University of Leicester, April 11, 2017, April 13, 2017, NEWS,weblink Jupiter’s Great Red Spot has company. Meet the Great Cold Spot, Science News, Ashley, Yeager, April 12, 2017, April 16, 2017, NEWS,weblink Scientists discover the ‘Great Cold Spot’ on Jupiter in upper atmosphere, Toronto Star, Associated Press, Marcia, Dunn, April 11, 2017, April 13, 2017,

Magnetosphere

{{multiple image |align=right |direction=horizontal |total_width=350
|image1=Hubble Captures Vivid Auroras in Jupiter's Atmosphere.jpg |caption1=Aurorae on the north pole of Jupiter as viewed by Hubble
|image2=PIA21033 Juno's View of Jupiter's Southern Lights.jpg |caption2=Infrared view of Jupiter's southern lights, taken by the Jovian Infrared Auroral Mapper
}}Jupiter's magnetic field is fourteen times as strong as that of Earth, 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). 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 ionized 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 magnetodisk. Electrons within the plasma sheet generate a strong radio signature that produces bursts in the range of 0.6–30 MHz.NEWS, Brainerd, Jim, November 22, 2004, Jupiter's Magnetosphere, The Astrophysics Spectator,weblink August 10, 2008, 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.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 (see below) 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 ionized 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.WEB, February 20, 2004,weblink Radio Storms on Jupiter, NASA, February 1, 2007, yes,weblink February 13, 2007,

Orbit and rotation

(File:Solarsystem3DJupiter.gif|thumb|Jupiter (red) completes one orbit of the Sun (center) for every 11.86 orbits of Earth (blue))Jupiter is the only planet whose barycenter with the Sun lies outside the volume of the Sun, though by only 7% of the Sun's radius.BOOK, Herbst, T.M., Rix, H.-W., 1999, Guenther, Eike, Stecklum, Bringfried, Klose, Sylvio, Star Formation and Extrasolar Planet Studies with Near-Infrared Interferometry on the LBT, Optical and Infrared Spectroscopy of Circumstellar Matter, Optical and Infrared Spectroscopy of Circumstellar Matter, ASP Conference Series., 188, 978-1-58381-014-9, 341–350, 1999ASPC..188..341H, Astronomical Society of the Pacific, San Francisco, Calif., – See section 3.4. 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 between the two largest planets in the Solar System.JOURNAL, Michtchenko, T.A., Ferraz-Mello, S., Modeling the 5 : 2 Mean-Motion Resonance in the Jupiter–Saturn Planetary System, Icarus, February 2001, 149, 2, 77–115, 10.1006/icar.2000.6539, 2001Icar..149..357M, The elliptical orbit of Jupiter is inclined 1.31° compared to Earth. Because the eccentricity of its orbit is 0.048, Jupiter's distance from the Sun varies by 75 million km between its nearest approach (perihelion) and furthest distance (aphelion).The axial tilt of Jupiter is relatively small: only 3.13°. As a result, it does not experience significant seasonal changes, in contrast to, for example, Earth and Mars.WEB,weblink Interplanetary Seasons, Science@NASA, February 20, 2007, yes,weblink October 16, 2007, 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 Earth-based amateur telescope. The planet is shaped as 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 {{convert|9275|km|0|abbr=on}} longer than the diameter measured through the poles.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 from the latitudes 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 first defined by radio astronomers, and corresponds to the rotation of the planet's magnetosphere; its period is Jupiter's official rotation.BOOK, Ian, Ridpath, 1998, Norton's Star Atlas, 19th, Prentice Hall, 978-0-582-35655-9, {{page needed|date=May 2015}}

Observation

{{multiple image |align=right |direction=horizontal |total_width=350
|image1=Conjunction of Jupiter and Moon.jpg |caption1=Conjunction of Jupiter and the Moon
|image2=Retrogradation1.svg |caption2=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); at times Mars appears 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 at opposition down to −1.66 during conjunction with the Sun. The mean apparent magnitude is -2.20 with a standard deviation of 0.33. The angular diameter of Jupiter likewise varies from 50.1 to 29.8 arc seconds. Favorable oppositions occur when Jupiter is passing through perihelion, an event that occurs once per orbit.Earth overtakes Jupiter every 398.9 days as it orbits the Sun, a duration called the synodic period. As it does so, Jupiter appears to undergo retrograde motion with respect to the background stars. That is, for a period Jupiter seems to move backward in the night sky, performing a looping motion.Because the orbit of Jupiter is outside that of Earth, the phase angle of Jupiter as viewed from Earth never exceeds 11.5°. That is, the planet 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.WEB, 1974,weblink Encounter with the Giant, NASA, February 17, 2007, A small telescope will usually show Jupiter's four Galilean moons and the prominent cloud belts across Jupiter's atmosphere.WEB,weblink How to Observe Jupiter, WikiHow, July 28, 2013, July 28, 2013, A large telescope will show Jupiter's Great Red Spot when it faces Earth.

Mythology

File:Jupiter-bonatti.png|thumb|left|Jupiter, woodcut from a 1550 edition of Guido BonattiGuido BonattiThe 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.NEWS, June 16, 2005, Stargazers prepare for daylight view of Jupiter, ABC News (Australia), ABC News,weblinkweblink" title="web.archive.org/web/20110512163240weblink">weblink May 12, 2011, February 28, 2008, 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.JOURNAL, Rogers, J.H., Origins of the ancient constellations: I. The Mesopotamian traditions, Journal of the British Astronomical Association, 1998, 108, 9–28, 1998JBAA..108....9R, 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").WEB, Harper, Douglas, November 2001,weblink Jupiter, Online Etymology Dictionary, February 23, 2007, 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.WEB,weblink Greek Names of the Planets, July 14, 2012, In Greek the name of the planet Jupiter is Dias, the Greek name of god Zeus., 2010-04-25, See also the (:el:Δίας (πλανήτης)|Greek article about the planet). The ancient Greeks knew the planet as Phaethon, meaning "shining one" or "blazing star."BOOK, 1888, Cicero's Tusculan Disputations; also, Treatises on The Nature of the Gods, and on The Commonwealth, Cicero, Marcus Tullius, English, Yonge, Charles Duke,weblink Harper & Brothers, New York, NY, 274, Internet Archive, BOOK, Cicero, Marcus Tullus, Cicero, Warmington, E. H., Rackham, H., 1967, 1933, De Natura Deorum, On The Nature of the Gods,weblink Cambridge University Press, Cambridge, MA, Cicero, 19, 175, Internet Archive, 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.The astronomical symbol for the planet, (File:Jupiter symbol.svg|14px), is a stylized representation of the god's lightning bolt. The original Greek deity Zeus supplies the root zeno-, used to form some Jupiter-related words, such as (wikt:zenographic|zenographic).{{refn |group=lower-alpha |See for example: NEWS, IAUC 2844: Jupiter; 1975h, International Astronomical Union, October 1, 1975,weblink October 24, 2010, That particular word has been in use since at least 1966. See: WEB,weblink Query Results from the Astronomy Database, Smithsonian/NASA, July 29, 2007, }}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.WEB,weblink Jovial, Dictionary.com, July 29, 2007, The Chinese, Vietnamese, Koreans and Japanese called it the "wood star" ({{zh|c=木星|p=mùxīng}}), based on the Chinese Five Elements.BOOK, Jan Jakob Maria, De Groot, 1912, Religion in China: universism. a key to the study of Taoism and Confucianism, American lectures on the history of religions, 10, 300, G.P. Putnam's Sons,weblink January 8, 2010, BOOK, Thomas, Crump, 1992, The Japanese numbers game: the use and understanding of numbers in modern Japan, Nissan Institute/Routledge Japanese studies series, 39–40, Routledge, 978-0-415-05609-0, BOOK, Homer Bezaleel, Hulbert, 1909, The passing of Korea, 426, Doubleday, Page & company,weblink January 8, 2010, Chinese Taoism personified it as the Fu star. The Greeks called it Φαέθων (Phaethon, meaning "blazing").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".WEB,weblink Guru, Indian Divinity.com, February 14, 2007, In Germanic mythology, Jupiter is equated to Thor, whence the English name Thursday for the Roman dies Jovis.JOURNAL, Falk, Michael, Astronomical Names for the Days of the Week, Journal of the Royal Astronomical Society of Canada, 2004, 93, 122–33, 1999JRASC..93..122F, 10.1016/j.newast.2003.07.002, Koresko, Christopher, astro-ph/0307398, In the 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.NEWS,weblink Türk Astrolojisi-2, NTV (Turkey), NTV, tr, April 23, 2010,weblink" title="archive.is/20130104145343weblink">weblink January 4, 2013, yes, mdy-all,

History of research and exploration

Pre-telescopic research

File:Almagest-planets.svg|thumb|Model in the AlmagestAlmagestThe observation of Jupiter dates back to at least the Babylonian astronomers of the 7th or 8th century BC.JOURNAL, Babylonian Observational Astronomy, A. Sachs, Philosophical Transactions of the Royal Society of London, 276, 1257, May 2, 1974, 43–50 (see p. 44), 74273, 10.1098/rsta.1974.0008, 1974RSPTA.276...43S, The ancient Chinese also observed the orbit of SuìxÄ«ng (}}) 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,JOURNAL, Homer H., Dubs, Homer H. Dubs, The Beginnings of Chinese Astronomy, Journal of the American Oriental Society, 78, 4, 1958, 295–300, 10.2307/595793, 595793, 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, discovered one of Jupiter's moons in 362{{sbc}} with the unaided eye. If accurate, this would predate Galileo's discovery by nearly two millennia.JOURNAL, Xi, Z.Z., The Discovery of Jupiter's Satellite Made by Gan-De 2000 Years Before Galileo, Acta Astrophysica Sinica, 1981, 1, 2, 87, 1981AcApS...1...85X, BOOK, Paul, Dong, 2002, China's Major Mysteries: Paranormal Phenomena and the Unexplained in the People's Republic, China Books, 978-0-8351-2676-2, 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.BOOK, A Survey of the Almagest, Olaf Pedersen, 1974, Odense University Press, 423, 428,

Ground-based telescope research

missing image!
- Galileo.arp.300pix.jpg -
upright|Galileo Galilei, discoverer of the four 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.JOURNAL, Pasachoff, Jay M., Simon Marius's Mundus Iovialis: 400th Anniversary in Galileo's Shadow, Journal for the History of Astronomy, 2015, 46, 2, 218–234, 2015AAS...22521505P, 10.1177/0021828615585493, It was Marius's names for the four major moons, however, that stuck—Io, Europa, Ganymede and Callisto. These findings were also the first discovery of celestial motion not apparently centered 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 placed him under the threat of the Inquisition.WEB, Westfall, Richard S,weblink Galilei, Galileo, The Galileo Project, January 10, 2007, During the 1660s, Giovanni Cassini used a new telescope to discover spots and colorful bands on Jupiter and observed that the planet appeared oblate; that is, flattened at the poles. He was also able to estimate the rotation period of the planet.WEB, O'Connor, J.J., Robertson, E.F., April 2003,weblink Giovanni Domenico Cassini, University of St. Andrews, February 14, 2007, In 1690 Cassini noticed that the atmosphere undergoes differential rotation.The Great Red Spot, a prominent oval-shaped feature in the southern hemisphere of Jupiter, 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.BOOK, Paul, Murdin, 2000, Encyclopedia of Astronomy and Astrophysics, Institute of Physics Publishing, Bristol, 978-0-12-226690-4, 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.WEB, August 1974,weblink SP-349/396 Pioneer Odyssey—Jupiter, Giant of the Solar System, NASA, August 10, 2006, Both Giovanni Borelli and Cassini made careful tables of the motions of Jupiter's moons, allowing predictions of the times 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), and this timing discrepancy was used to estimate the speed of light.WEB,weblink Roemer's Hypothesis, MathPages, January 12, 2007, In 1892, E. E. Barnard observed a fifth satellite of Jupiter with the {{convert|36|in|adj=on}} refractor at Lick Observatory in California. The discovery of this relatively small object, a testament to his keen eyesight, quickly made him famous. This moon was later named Amalthea.WEB, Joe, Tenn, March 10, 2006,weblink Edward Emerson Barnard, Sonoma State University, January 10, 2007, It was the last planetary moon to be discovered directly by visual observation.WEB, October 1, 2001,weblink Amalthea Fact Sheet, NASA/JPL, February 21, 2007, File:Jupiter MAD.jpg|thumb|right|Infrared image of Jupiter taken by ESO's Very Large TelescopeVery Large TelescopeIn 1932, Rupert Wildt identified absorption bands of ammonia and methane in the spectra of Jupiter.JOURNAL, Dunham Jr., Theodore, Note on the Spectra of Jupiter and Saturn, Publications of the Astronomical Society of the Pacific, 1933, 45, 263, 42–44, 1933PASP...45...42D, 10.1086/124297, 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.JOURNAL, Youssef, A., Marcus, P.S., The dynamics of jovian white ovals from formation to merger, Icarus, 2003, 162, 1, 74–93, 2003Icar..162...74Y, 10.1016/S0019-1035(02)00060-X,

Radiotelescope research

In 1955, Bernard Burke and Kenneth Franklin detected bursts of radio signals coming from Jupiter at 22.2 MHz. The period of these bursts matched the rotation of the planet, and they were also able to use 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) that had a duration of less than a hundredth of a second.WEB, Weintraub, Rachel A., September 26, 2005,weblink How One Night in a Field Changed Astronomy, NASA, February 18, 2007, Scientists discovered that there were three forms of radio signals transmitted from Jupiter.
  • Decametric radio bursts (with a wavelength of tens of meters) vary with the rotation of Jupiter, and are influenced by interaction of Io with Jupiter's magnetic field.WEB, Garcia, Leonard N,weblink The Jovian Decametric Radio Emission, NASA, February 18, 2007,
  • Decimetric radio emission (with wavelengths measured in centimeters) was first observed by Frank Drake and Hein Hvatum in 1959. The origin of this signal was from a torus-shaped belt around Jupiter's equator. This signal is caused by cyclotron radiation from electrons that are accelerated in Jupiter's magnetic field.WEB, Klein, M.J., Gulkis, S., Bolton, S.J., 1996,weblink Jupiter's Synchrotron Radiation: Observed Variations Before, During and After the Impacts of Comet SL9, NASA, February 18, 2007,
  • Thermal radiation is produced by heat in the atmosphere of Jupiter.

Exploration

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 the properties and phenomena of the Solar System's largest planet.NASA – Pioneer 10 Mission Profile {{webarchive|url=https://web.archive.org/web/20151106205010weblink |date=November 6, 2015 }}. NASA. Retrieved on December 22, 2011.NASA – Glenn Research Center. NASA. Retrieved on December 22, 2011. Flights to other 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/sFortescue, Peter W.; Stark, John and Swinerd, Graham Spacecraft systems engineering, 3rd ed., John Wiley and Sons, 2003, {{ISBN|0-470-85102-3}} p. 150. which is comparable to the 9.7 km/s delta-v needed to reach low Earth orbit.WEB, Hirata, Chris,weblink Delta-V in the Solar System, California Institute of Technology, November 28, 2006,weblink" title="web.archive.org/web/20060715015836weblink">weblink July 15, 2006, yes, 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.WEB, Wong, Al, May 28, 1998,weblink Galileo FAQ: Navigation, NASA, November 28, 2006,

Flyby missions

File:PIA21645-Jupiter-PerijovePass-JunoCam-20170525.jpg|thumb|center|800px|Perijove 6 pass of Jupiter as viewed by JunoCamJunoCam{| class="wikitable floatright"|+ Flyby missions! Spacecraft! Closest approach! Distance| Pioneer 10| December 3, 1973 130,000 km| Pioneer 11| December 4, 1974 34,000 km| Voyager 1| March 5, 1979 349,000 km| Voyager 2| July 9, 1979 570,000 km Ulysses| February 8, 1992 408,894 km| February 4, 2004 120,000,000 kmCassini–Huygens>Cassini
| December 30, 2000 10,000,000 km| New Horizons| February 28, 2007 2,304,535 kmBeginning 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.WEB, Lasher, Lawrence, August 1, 2006,weblink Pioneer Project Home Page, NASA Space Projects Division, November 28, 2006, yes,weblink" title="web.archive.org/web/20060101001205weblink">weblink January 1, 2006, 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 ionized 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.WEB, January 14, 2003,weblink Jupiter, NASA/JPL, November 28, 2006, The next mission to encounter Jupiter was the Ulysses solar probe. It performed a flyby maneuver to attain a polar orbit around the Sun. During this pass, the spacecraft conducted studies on Jupiter's magnetosphere. Ulysses has no cameras so no images were taken. A second flyby six years later was at a much greater distance.BOOK, Chan, K., Space OPS 2004 Conference, Paredes, E.S., Ryne, M.S., 2004, American Institute of Aeronautics and Astronautics, 10.2514/6.2004-650-447, Ulysses Attitude and Orbit Operations: 13+ Years of International Cooperation, (File:PIA02879 - A New Year for Jupiter and Io.jpg|thumb|Cassini views Jupiter and Io on January 1, 2001)In 2000, the Cassini probe flew by Jupiter on its way to Saturn, and provided some of the highest-resolution images ever made of the planet.JOURNAL, Hansen, C.J., Bolton, S.J., Matson, D.L., Spilker, L.J., Lebreton, J.-P., The Cassini–Huygens flyby of Jupiter, 2004Icar..172....1H, Icarus, 2004, 172, 1, 1–8, 10.1016/j.icarus.2004.06.018, The New Horizons probe flew by Jupiter for a gravity assist en route to Pluto. Its closest approach was on February 28, 2007.WEB,weblinkweblink" title="web.archive.org/web/20070429113112weblink">weblink April 29, 2007, Mission Update: At Closest Approach, a Fresh View of Jupiter, July 27, 2007, 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.WEB,weblink Pluto-Bound New Horizons Provides New Look at Jupiter System, July 27, 2007, Imaging of the Jovian system began September 4, 2006.NEWS, January 19, 2007,weblink New Horizons targets Jupiter kick, BBC News, January 20, 2007, WEB, Alexander, Amir, September 27, 2006,weblinkweblink" title="web.archive.org/web/20070221220556weblink">weblink February 21, 2007, New Horizons Snaps First Picture of Jupiter, The Planetary Society, December 19, 2006,

Galileo mission

File:Portrait of Jupiter from Cassini.jpg|thumb|left|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. 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.WEB, McConnell, Shannon, April 14, 2003,weblink Galileo: Journey to Jupiter, NASA/JPL, November 28, 2006, A 340-kilogram titanium atmospheric probe was released from the spacecraft in July 1995, entering Jupiter's atmosphere on December 7. It parachuted through {{convert|150|km|0|abbr=on}} of the atmosphere at a speed of about 2,575 km/h (1600 mph) and collected data for 57.6 minutes before the signal was lost at a pressure of about 23 atmospheres at a temperature of 153 Â°C.WEB, Julio, Magalhães, December 10, 1996,weblink Galileo Probe Mission Events, NASA Space Projects Division, February 2, 2007, yes,weblink" title="web.archive.org/web/20070102143553weblink">weblink January 2, 2007, It melted thereafter, and possibly vaporized. 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 Europa, a moon which has been hypothesized to have the possibility of harboring life.Data from this mission revealed that hydrogen composes up to 90% of Jupiter's atmosphere. The recorded temperature was more than 300 Â°C (>570 Â°F) and the windspeed measured more than 644 km/h (>400 mph) before the probes vapourised.File:PIA22946-Jupiter-RedSpot-JunoSpacecraft-20190321.jpg|thumb|right|250px|Jupiter viewed by the Juno spacecraft(February 12, 2019)]]

Juno mission

NASA's Juno mission arrived at Jupiter on July 4, 2016, and is expected to complete 37 orbits over the next 20 months. The mission plan called for Juno to study the planet in detail from a polar orbit.WEB, Anthony, Goodeill, March 31, 2008,weblink New Frontiers – Missions – Juno, NASA, January 2, 2007, yes,weblink" title="web.archive.org/web/20070203235637weblink">weblink February 3, 2007, mdy-all, 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.WEB, Niall, Firth, September 5, 2016,weblink NASA's Juno probe snaps first images of Jupiter's north pole, New Scientist, September 5, 2016,

Future probes

The next planned mission to the Jovian system will be the European Space Agency's Jupiter Icy Moon Explorer (JUICE), due to launch in 2022,NEWS, Jonathan, Amos,weblink Esa selects 1bn-euro Juice probe to Jupiter, May 2, 2012, May 2, 2012, BBC News Online, followed by NASA's Europa Clipper mission in 2025.NEWS, Wall, Mike, NASA Eyes Ambitious Mission to Jupiter's Icy Moon Europa by 2025,weblink March 5, 2014, Space.com, September 23, 2015,

Canceled missions

There has been great interest in studying the icy moons in detail because of the possibility of subsurface liquid oceans on Jupiter's moons Europa, Ganymede, and Callisto. Funding difficulties have delayed progress. NASA's JIMO (Jupiter Icy Moons Orbiter) was cancelled in 2005.NEWS, Brian, Berger, White House scales back space plans, MSNBC, February 7, 2005,weblink January 2, 2007, 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.WEB,weblink Laplace: A mission to Europa & Jupiter system, European Space Agency, January 23, 2009, 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.New approach for L-class mission candidates, ESA, April 19, 2011

Moons

{{Commons category|Moons of Jupiter}}{{see also|Timeline of discovery of Solar System planets and their moons}}Jupiter has 79 known natural satellites.WEB,weblink A Dozen New Moons of Jupiter Discovered, Including One "Oddball", Carnegie Institution for Science, July 16, 2018, WEB,weblink The Giant Planet Satellite and Moon Page, Sheppard, Scott S., Department of Terrestrial Magnetism at Carnegie Institution for Science, December 19, 2014, yes,weblink" title="web.archive.org/web/20090607094153weblink">weblink June 7, 2009, mdy-all, Of these, 63 are less than 10 kilometres in diameter and have only been discovered since 1975. The four largest moons, visible from Earth with binoculars on a clear night, known as the "Galilean moons", are Io, Europa, Ganymede, and Callisto.

Galilean moons

The moons discovered by Galileo—Io, Europa, Ganymede, and Callisto—are among the largest satellites 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 circularize their orbits.JOURNAL, Musotto, S., Varadi, F., Moore, W.B., Schubert, G., Numerical simulations of the orbits of the Galilean satellites,weblink Icarus, 2002, 159, 2, 500–504, 10.1006/icar.2002.6939, 2002Icar..159..500M, 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. This is seen most dramatically in the extraordinary volcanic activity of innermost Io (which is subject to the strongest tidal forces), and to a lesser degree in the geological youth of Europa's surface (indicating recent resurfacing of the moon's exterior).{| style="width:550px; margin:0 auto;" cellpadding=0 cellspacing=0|{| class="wikitable" style="text-align:right; margin:0 auto;"|+ The Galilean moons, compared to Earth's Moon! rowspan=2 | Name! rowspan=2 | (Help:IPA/English|IPA)! colspan=2 | Diameter! colspan=2 | Mass! colspan=2 | Orbital radius! colspan=2 | Orbital period! km! %! kg! %! km! %! days! %! Io {{small/ˈaɪ.oʊ/}}}}| 3,643| 105| 8.9×1022| 120| 421,700| 110| 1.77| 7! Europa {{small/jʊˈroʊpə/}}}}| 3,122| 90| 4.8×1022| 65| 671,034| 175| 3.55| 13! Ganymede {{small/ˈɡænimiːd/}}}}| 5,262| 150| 14.8×1022| 200| 1,070,412| 280| 7.15| 26! Callisto {{small/kəˈlɪstoʊ/}}}}| 4,821| 140| 10.8×1022| 150| 1,882,709| 490| 16.69| 61framelesscenterIo (moon)>Io, Europa (moon), Ganymede (moon)>Ganymede, Callisto.]] The Galilean moons Io (moon), Europa (moon)>Europa, Ganymede (moon), Callisto (moon)>Callisto (in order of increasing distance from Jupiter)

Classification

Before the discoveries of the Voyager missions, Jupiter's moons were arranged neatly into four groups of four, based on commonality of their orbital elements. Since then, the large number of new small outer moons has complicated this picture. There are now thought to be six main groups, although some are more distinct than others.A basic sub-division is a grouping of the eight inner regular moons, which have nearly circular orbits near the plane of Jupiter's equator and are thought to have formed with Jupiter. The remainder of the moons consist of an unknown number of small irregular moons with elliptical and inclined orbits, which 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.BOOK, Jewitt, D.C., Sheppard, S., Porco, C., Bagenal, F., Dowling, T., McKinnon, W, 2004, Jupiter: The Planet, Satellites and Magnetosphere, Cambridge University Press, 978-0-521-81808-7,weblinkweblink" title="web.archive.org/web/20090326065151weblink">weblink March 26, 2009, PDF, JOURNAL, Nesvorný, D., Alvarellos, J.L.A., Dones, L., Levison, H.F., Orbital and Collisional Evolution of the Irregular Satellites, The Astronomical Journal, 2003, 126, 1, 398–429, 2003AJ....126..398N, 10.1086/375461, {| class="wikitable"! colspan="2" | Regular moonsInner satellites of Jupiter>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>Galilean moonsTHE GALILEAN SATELLITES >AUTHOR=SHOWMAN, A. P. JOURNAL=SCIENCE VOLUME=286 PAGES=77–84 PMID=10506564, | 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.! colspan="2" | Irregular moonsThemisto (moon)>Themisto| This is a single moon belonging to a group of its own, orbiting halfway between the Galilean moons and the Himalia group.| Himalia group| A tightly clustered group of moons with orbits around 11,000,000–12,000,000 km from Jupiter.Carpo (moon)>Carpo| Another isolated case; at the inner edge of the Ananke group, it orbits Jupiter in prograde direction.Valetudo (moon)>Valetudo| A third isolated case, which has a prograde orbit but overlaps the retrograde groups listed below; this may result in a future collision.Ananke group>Ananke groupRetrograde motion>retrograde orbit group has rather indistinct borders, averaging 21,276,000 km from Jupiter with an average inclination of 149 degrees.| Carme group| A fairly distinct retrograde group that averages 23,404,000 km from Jupiter with an average inclination of 165 degrees.| Pasiphae group| A dispersed and only vaguely distinct retrograde group that covers all the outermost moons.

Planetary rings

File:PIA01627 Ringe.jpg|thumb|The rings of Jupiterrings of JupiterJupiter 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.JOURNAL, Showalter, M.A., Burns, J.A., Cuzzi, J.N., Pollack, J.B., Jupiter's ring system: New results on structure and particle properties, 1987Icar...69..458S, Icarus, 1987, 69, 3, 458–98, 10.1016/0019-1035(87)90018-2, These rings appear to be made of dust, rather than ice as with Saturn's rings. 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.JOURNAL, Burns, J. A., Showalter, M.R., Hamilton, D.P., 3, Nicholson, P.D., de Pater, I., Ockert-Bell, M.E., Thomas, P.C., The Formation of Jupiter's Faint Rings, Science, 1999, 284, 1146–50, 10.1126/science.284.5417.1146, 1999Sci...284.1146B, 10325220, 5417, In a similar way, the moons Thebe and Amalthea probably produce the two distinct components of the dusty gossamer ring. There is also evidence of a rocky ring strung along Amalthea's orbit which may consist of collisional debris from that moon.JOURNAL, Fieseler, P.D., The Galileo Star Scanner Observations at Amalthea, 2004Icar..169..390F, Icarus, 2004, 169, 2, 390–401, 10.1016/j.icarus.2004.01.012, Adams, O.W., Vandermey, N., Theilig, E.E., Schimmels, K.A., Lewis, G.D., Ardalan, S.M., Alexander, C.J., 3,

Interaction with the Solar System

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 of the inner Solar System's history.JOURNAL, Kerr, Richard A., Did Jupiter and Saturn Team Up to Pummel the Inner Solar System?, Science, 2004, 306, 5702, 1676,weblink August 28, 2007, 10.1126/science.306.5702.1676a, 15576586, File:InnerSolarSystem-en.png|thumb|This diagram shows the Trojan asteroids in Jupiter's orbit, as well as the main asteroid beltasteroid beltAlong with 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.WEB,weblink List Of Jupiter Trojans, October 24, 2010, IAU Minor Planet Center, The largest is 624 Hektor.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 circularized by regular gravitational interaction with the Sun and Jupiter.JOURNAL, Quinn, T., Tremaine, S., Duncan, M., Planetary perturbations and the origins of short-period comets, Astrophysical Journal, Part 1, 1990, 355, 667–679, 1990ApJ...355..667Q, 10.1086/168800, Due to the magnitude of Jupiter's mass, the center of gravity between it and the Sun lies just above the Sun's surface.WEB,weblink Rafi Letzter, Forget what you heard: Jupiter does not orbit the sun, Tech Insider, July 18, 2016, July 30, 2016, Jupiter is the only body in the Solar System for which this is true.

Impacts

{{see also|Comet Shoemaker–Levy 9|2009 Jupiter impact event|2010 Jupiter impact event}}File:Hs-2009-23-crop.jpg|thumb|Hubble image taken on July 23, 2009, showing a blemish of about {{convert|5,000|miles|km|abbr=on|order=flip}} long left by the 2009 Jupiter impact.NEWS, Dennis Overbye, Hubble Takes Snapshot of Jupiter's 'Black Eye',weblink July 24, 2009, The New York TimesThe New York TimesJupiter has been called the Solar System's vacuum cleaner,NEWS, Richard A., Lovett, Stardust's Comet Clues Reveal Early Solar System, National Geographic News, December 15, 2006,weblink January 8, 2007, because of its immense gravity well and location near the inner Solar System. It receives the most frequent comet impacts of the Solar System's planets.JOURNAL, Nakamura, T., Kurahashi, H., Collisional Probability of Periodic Comets with the Terrestrial Planets: An Invalid Case of Analytic Formulation, Astronomical Journal, 1998, 115, 2, 848–854,weblink August 28, 2007, 10.1086/300206, 1998AJ....115..848N, It was thought that the planet served to partially shield the inner system from cometary bombardment. 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.JOURNAL, Horner, J., Jones, B.W., 2008, Jupiter – friend or foe? I: the asteroids., International Journal of Astrobiology, 7, 3–4, 251–261, 10.1017/S1473550408004187, 0806.2795, 2008IJAsB...7..251H, 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 alleged Oort cloud.NEWS, Dennis, Overbyte, July 25, 2009, Jupiter: Our Comic Protector?, The New York Times, July 27, 2009,weblink Jupiter experiences about 200 times more asteroid and comet impacts than Earth.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.JOURNAL, Tabe, Isshi, Watanabe, Jun-ichi, Jimbo, Michiwo, February 1997, Discovery of a Possible Impact SPOT on Jupiter Recorded in 1690, Publications of the Astronomical Society of Japan, 49, L1–L5, 1997PASJ...49L...1T, 10.1093/pasj/49.1.l1, More recent discoveries include the following:
  1. A fireball was photographed by Voyager 1 during its Jupiter encounter in March 1979.
  2. During the period July 16, 1994, to July 22, 1994, over 20 fragments from the comet Shoemaker–Levy 9 (SL9, formally designated D/1993 F2) collided with Jupiter's southern hemisphere, providing the first direct observation of a collision between two Solar System objects. This impact provided useful data on the composition of Jupiter's atmosphere.WEB, Baalke, Ron,weblink Comet Shoemaker-Levy Collision with Jupiter, NASA, January 2, 2007, NEWS, Robert R., Britt, Remnants of 1994 Comet Impact Leave Puzzle at Jupiter, Space.com, August 23, 2004,weblink February 20, 2007,
  3. On July 19, 2009, an impact site was discovered at approximately 216 degrees longitude in System 2.NEWS,weblink Amateur astronomer discovers Jupiter collision, July 21, 2009, ABC News (Australia), ABC News, July 21, 2009, WEB,weblink Mike, Salway, July 19, 2009, Breaking News: Possible Impact on Jupiter, Captured by Anthony Wesley, IceInSpace, July 19, 2009, This impact left behind a black spot in Jupiter's atmosphere, similar in size to Oval BA. Infrared observation showed a bright spot where the impact took place, meaning the impact warmed up the lower atmosphere in the area near Jupiter's south pole.NEWS, Grossman, Lisa, July 20, 2009, Jupiter sports new 'bruise' from impact, New Scientist,weblink
  4. A fireball, smaller than the previous observed impacts, was detected on June 3, 2010, by Anthony Wesley, an amateur astronomer in Australia, and was later discovered to have been captured on video by another amateur astronomer in the Philippines.WEB,weblink Another impact on Jupiter, June 4, 2010, Michael, Bakich, Astronomy (magazine), Astronomy, June 4, 2010,
  5. Yet another fireball was seen on August 20, 2010.WEB,weblink Another Flash on Jupiter!, Beatty, Kelly, August 22, 2010, Sky & Telescope, Sky Publishing, Masayuki Tachikawa was observing ... 18:22 Universal Time on the 20th ... Kazuo Aoki posted an image ... Ishimaru of Toyama prefecture observed the event, August 23, 2010,
  6. On September 10, 2012, another fireball was detected.WEB, September 10, 2012, Another fireball on Jupiter?, Cosmic Diary blog, Franck Marchis, Franck Marchis,weblink September 11, 2012, WEB,weblink George's Astrophotography, George, Hall, September 2012, 10 Sept. 2012 11:35 UT .. observed by Dan Petersen, September 17, 2012,
  7. On March 17, 2016 an asteroid or comet struck and was filmed on video.WEB,weblink Jupiter Struck by an Asteroid or a Comet [Video], Malik, SPACE.com, Tariq, Scientific American, March 30, 2016,

See also

{{Wikipedia books|1=Jupiter|3=Solar System}}

Notes

{{reflist|group=lower-alpha}}

References

written by Aldo Vitagliano; see also Invariable plane)JOURNAL, 10.1007/s11214-005-1960-4, Miller, Steve, Aylward, Alan, Millward, George, January 2005, Giant Planet Ionospheres and Thermospheres: The Importance of Ion-Neutral Coupling, Space Science Reviews, 116, 1–2, 319–343, 2005SSRv..116..319M, JOURNAL, Numerical expressions for precession formulae and mean elements for the Moon and planets, Astronomy and Astrophysics, 282, 2, 663–683, February 1994, Simon, J.L., Bretagnon, P., Chapront, J., Chapront-Touzé, M., Francou, G., Laskar, J., 1994A&A...282..663S, JOURNAL, Mallama, A., Hilton, J.L., Computing Apparent Planetary Magnitudes for The Astronomical Almanac, Astronomy and Computing, 25, 10–24, 2018, 10.1016/j.ascom.2018.08.002, 2018A&C....25...10M, 1808.01973, JOURNAL, Less absorbed solar energy and more internal heat for Jupiter, Liming, Li, etal, Nature Communications, 9, 1, 3709, 2018, 10.1038/s41467-018-06107-2, 30213944, 6137063, 2018NatCo...9.3709L, JOURNAL, Comprehensive wide-band magnitudes and albedos for the planets, with applications to exo-planets and Planet Nine, Icarus, Anthony, Mallama, Bruce, Krobusek, Hristo, Pavlov, 282, 19–33, 2017, 10.1016/j.icarus.2016.09.023, 2017Icar..282...19M, 1609.05048, }}

Further reading

  • BOOK, Bagenal, F., Dowling, T.E., McKinnon, W.B., 2004, Jupiter: The planet, satellites, and magnetosphere, Cambridge, Cambridge University Press, 978-0-521-81808-7,
  • BOOK, Reta Beebe, Beebe, Reta, Jupiter: The Giant Planet, Second, 1997, Smithsonian Institution Press, Washington, DC, 978-1-56098-731-4,
  • MAGAZINE, What Voyager Saw: Jupiter's Dazzling Realm, Rick, Gore, National Geographic (magazine), National Geographic, 157, 1, January 1980, 2–30, 0027-9358, 643483454,
  • JOURNAL, 10.1007/s10569-007-9072-y, Seidelmann, P. Kenneth, Archinal, Brent A., A'Hearn, Michael F., 3, Conrad, Albert R., Consolmagno, Guy J., Hestroffer, Daniel, Hilton, James L., Krasinsky, Georgij A., Neumann, Gregory A., Oberst, Jürgen, Stooke, Philip J., Tedesco, Edward F., Tholen, David J., Thomas, Peter C., Williams, Iwan P., 2007, Report of the IAU/IAG Working Group on cartographic coordinates and rotational elements: 2006, Celestial Mechanics and Dynamical Astronomy, 98, 3, 155–180, 2007CeMDA..98..155S,weblink
  • BOOK, Lissauer, Jack J., de Pater, Imke, Planetary Sciences, 2015,weblink 250, Cambridge University Press, New York, 978-0-521-85371-2, 2nd updated,

External links

{{Sisterlinks}} {{Jupiter|show=yes}}{{Moons of Jupiter}}{{Jupiter spacecraft}}{{Solar System}}{{Authority control}}

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