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(i)

by volume:

89.8±2.0% hydrogen (H2)

10.2±2.0% helium (He)

≈ 0.3% methane (CH4)

≈ 0.026% ammonia (NH3)

≈ 0.003% hydrogen deuteride (HD)

0.0006% ethane (C2H6)

0.0004% water (H2O)

ICES:

* ammonia (NH3) * water (H2O) * ammonium hydrosulfide (NH4SH)

JUPITER is the fifth planet from the Sun
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
Solar System
combined. Jupiter
Jupiter
and Saturn
Saturn
are gas giants ; the other two giant planets, Uranus
Uranus
and Neptune
Neptune
are ice giants . Jupiter
Jupiter
has been known to astronomers since antiquity. The Romans named it after their god Jupiter
Jupiter
. When viewed from Earth
Earth
, Jupiter
Jupiter
can reach an apparent magnitude of −2.94, bright enough for its reflected light to cast shadows, and making it on average the third-brightest object in the night sky after the Moon
Moon
and Venus
Venus
.

Jupiter
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, but like the other giant planets, Jupiter
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
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
Jupiter
is a faint planetary ring system and a powerful magnetosphere . Jupiter
Jupiter
has at least 69 moons , including the four large Galilean moons
Galilean moons
discovered by Galileo Galilei
Galileo Galilei
in 1610. Ganymede , the largest of these, has a diameter greater than that of the planet Mercury .

Jupiter
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
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
Pluto
. The latest probe to visit the planet is _Juno _, which entered into orbit around Jupiter
Jupiter
on July 4, 2016. Future targets for exploration in the Jupiter
Jupiter
system include the probable ice-covered liquid ocean of its moon Europa .

CONTENTS

* 1 Formation and migration

* 2 Physical characteristics

* 2.1 Composition * 2.2 Mass
Mass
and size * 2.3 Internal structure

* 2.4 Atmosphere

* 2.4.1 Cloud layers * 2.4.2 Great Red Spot
Great Red Spot
and other vortices

* 2.5 Magnetosphere
Magnetosphere

* 3 Orbit and rotation * 4 Observation

* 5 Research and exploration

* 5.1 Pre-telescopic research * 5.2 Ground-based telescope research * 5.3 Radiotelescope research

* 5.4 Exploration

* 5.4.1 Flyby missions * 5.4.2 _Galileo_ mission * 5.4.3 _Juno_ mission * 5.4.4 Future probes * 5.4.5 Canceled missions

* 6 Moons

* 6.1 Galilean moons
Galilean moons
* 6.2 Classification * 6.3 Planetary rings

* 7 Interaction with the Solar System
Solar System

* 7.1 Impacts

* 8 Mythology * 9 See also * 10 Notes * 11 References * 12 Further reading * 13 External links

FORMATION AND MIGRATION

Main article: Grand Tack Hypothesis See also: Formation and evolution of the Solar System
Solar System

Earth
Earth
and its neighbor planets may have formed from fragments of planets after collisions with Jupiter
Jupiter
destroyed those super-Earths near the Sun. As Jupiter
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.

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.

Jupiter
Jupiter
moving out of the inner Solar System
Solar System
would have allowed the formation of inner planets, including Earth
Earth
.

PHYSICAL CHARACTERISTICS

Jupiter
Jupiter
is composed primarily of gaseous and liquid matter. It is the largest of the four giant planets in the Solar System
Solar System
and hence its largest planet. It has a diameter of 142,984 km (88,846 mi) 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. Through infrared and ultraviolet measurements, trace amounts of benzene and other hydrocarbons have also been found.

The atmospheric proportions of hydrogen and helium are close to the theoretical composition of the primordial solar nebula . Neon
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. Helium
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.

Based on spectroscopy , Saturn
Saturn
is thought to be similar in composition to Jupiter, but the other giant planets Uranus
Uranus
and Neptune have relatively less hydrogen and helium and relatively more ices and are thus now termed ice giants .

MASS AND SIZE

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
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
Solar System
combined—this is so massive that its barycenter with the Sun
Sun
lies above the Sun\'s surface at 1.068 solar radii from the Sun's center. Jupiter
Jupiter
is much larger than Earth
Earth
and considerably less dense: its volume is that of about 1,321 Earths, but it is only 318 times as massive. Jupiter's radius is about 1/10 the radius of the Sun
Sun
, and its mass is 0.001 times the mass of the Sun
Sun
, so the densities of the two bodies are similar. A " Jupiter mass " (_M_J or _M_Jup) 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 0.69 _M_J, while Kappa Andromedae b has a mass of 12.8 _M_J.

Theoretical models indicate that if Jupiter
Jupiter
had much more mass than it does at present, it would shrink. For small changes in mass, the radius would not change appreciably, and above about 500 _M_⊕ (1.6 Jupiter
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
Jupiter
is thought to have about as large a diameter as a planet of its composition and evolutionary history can achieve. 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.

Although Jupiter
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. Despite this, Jupiter
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. This additional heat is generated by the Kelvin–Helmholtz mechanism through contraction. This process causes Jupiter
Jupiter
to shrink by about 2 cm each year. When it was first formed, Jupiter
Jupiter
was much hotter and was about twice its current diameter.

INTERNAL STRUCTURE

Jupiter
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. 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. Animation of Jupiter
Jupiter
seen in infrared

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.

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.

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 . 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.

The temperature and pressure inside Jupiter
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 340 K (67 °C; 152 °F). At the phase transition region where hydrogen—heated beyond its critical point—becomes metallic, it is calculated the temperature is 10,000 K (9,700 °C; 17,500 °F) and the pressure is 200 GPa . The temperature at the core boundary is estimated to be 36,000 K (35,700 °C; 64,300 °F) and the interior pressure is roughly 3,000 –4,500 GPa. This cut-away illustrates a model of the interior of Jupiter, with a rocky core overlaid by a deep layer of liquid metallic hydrogen .

ATMOSPHERE

Main article: Atmosphere of Jupiter

Jupiter
Jupiter
has the largest planetary atmosphere in the Solar System, spanning over 5,000 km (3,000 mi) in altitude. Because Jupiter
Jupiter
has no surface, the base of its atmosphere is usually considered to be the point at which atmospheric pressure is equal to 100 kPa (1.0 bar).

Cloud Layers

The movement of Jupiter's counter-rotating cloud bands. This looping animation maps the planet's exterior onto a cylindrical projection . South polar view of Jupiter
Jupiter
Enhanced color view of Jupiter's southern storms

Jupiter
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. 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.

The cloud layer is only 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 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. The water clouds are assumed to generate thunderstorms in the same way as terrestrial thunderstorms, driven by the heat rising from the interior.

The orange and brown coloration in the clouds of Jupiter
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 . 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.

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
Great Red Spot
And Other Vortices

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 best known feature of Jupiter
Jupiter
is the Great Red Spot
Great Red Spot
, 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, and possibly since 1665. Images by the Hubble Space Telescope
Telescope
have shown as many as two "red spots" adjacent to the Great Red Spot. The storm is large enough to be visible through Earth-based telescopes with an aperture of 12 cm or larger. The oval object rotates counterclockwise , with a period of about six days. The maximum altitude of this storm is about 8 km (5 mi) above the surrounding cloudtops. Jupiter
Jupiter
Great Red Spot
Great Red Spot
is decreasing in size (May 15, 2014).

The Great Red Spot
Great Red Spot
is large enough to accommodate Earth
Earth
within its boundaries. Mathematical models suggest that the storm is stable and may be a permanent feature of the planet. 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). _Hubble _ observations in 1995 showed it had decreased in size again 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), and is decreasing in length by about 930 km (580 mi) per year.

Storms such as this are common within the turbulent atmospheres of giant planets . Jupiter
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
Oval
BA , and has been nicknamed Red Spot Junior. It has since increased in intensity and changed color from white to red.

In April 2017, scientists reported the discovery of a "Great Cold Spot" in Jupiter's thermosphere at its north pole that is 24,000 km (15,000 mi) across, 12,000 km (7,500 mi) wide, and 200 °C (360 °F) cooler than surrounding material. The feature was discovered by researchers at the Very Large Telescope
Telescope
in Chile, who then searched archived data from the NASA
NASA
Infrared
Infrared
Telescope
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.

MAGNETOSPHERE

Main article: Magnetosphere
Magnetosphere
of Jupiter
Jupiter
Aurorae on the north pole of Jupiter
Jupiter
as viewed by Hubble Infrared
Infrared
view of Jupiter's southern lights, taken by the Jovian Infrared
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
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 .

At about 75 Jupiter
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
Jupiter
all orbit within the magnetosphere, which protects them from the solar wind.

The magnetosphere of Jupiter
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
Jupiter
can exceed the solar radio output.

ORBIT AND ROTATION

Jupiter
Jupiter
(red) completes one orbit of the Sun
Sun
(center) for every 11.86 orbits of Earth
Earth
(blue)

Jupiter
Jupiter
is the only planet whose barycenter with the Sun
Sun
lies outside the volume of the Sun, though by only 7% of the Sun's radius. The average distance between Jupiter
Jupiter
and the Sun
Sun
is 778 million km (about 5.2 times the average distance between Earth
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. The elliptical orbit of Jupiter
Jupiter
is inclined 1.31° compared to Earth. Because the eccentricity of its orbit is 0.048, Jupiter's distance from the Sun
Sun
varies by 75 million km between its nearest approach (perihelion ) and furthest distance (aphelion ).

The axial tilt of Jupiter
Jupiter
is relatively small: only 3.13°. As a result, it does not experience significant seasonal changes, in contrast to, for example, Earth
Earth
and Mars.

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 9,275 km (5,763 mi) longer than the diameter measured through the poles.

Because Jupiter
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.

OBSERVATION

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

Jupiter
Jupiter
is usually the fourth brightest object in the sky (after the Sun, the Moon
Moon
and Venus
Venus
); at times Mars
Mars
appears brighter than Jupiter. Depending on Jupiter's position with respect to the Earth
Earth
, it can vary in visual magnitude from as bright as −2.9 at opposition down to −1.6 during conjunction with the Sun. The angular diameter of Jupiter
Jupiter
likewise varies from 50.1 to 29.8 arc seconds . Favorable oppositions occur when Jupiter
Jupiter
is passing through perihelion , an event that occurs once per orbit.

Earth
Earth
overtakes Jupiter
Jupiter
every 398.9 days as it orbits the Sun, a duration called the synodic period . As it does so, Jupiter
Jupiter
appears to undergo retrograde motion with respect to the background stars. That is, for a period Jupiter
Jupiter
seems to move backward in the night sky, performing a looping motion.

Because the orbit of Jupiter
Jupiter
is outside that of Earth, the phase angle of Jupiter
Jupiter
as viewed from Earth
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
Jupiter
that crescent views of the planet were obtained. A small telescope will usually show Jupiter's four Galilean moons
Galilean moons
and the prominent cloud belts across Jupiter\'s atmosphere . A large telescope will show Jupiter's Great Red Spot
Great Red Spot
when it faces Earth.

RESEARCH AND EXPLORATION

PRE-TELESCOPIC RESEARCH

_ Model in the Almagest
Almagest
_ of the longitudinal motion of Jupiter (☉) relative to Earth
Earth
(⊕)

The observation of Jupiter
Jupiter
dates back to at least the Babylonian astronomers of the 7th or 8th century BC. The ancient Chinese also observed the orbit of _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 岁) when referring to years of age. By the 4th century BC, these observations had developed into the Chinese zodiac , 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
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 BC with the unaided eye. If accurate, this would predate Galileo's discovery by nearly two millennia. In his 2nd century work the _ Almagest
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
Earth
as 4332.38 days, or 11.86 years. In 499, Aryabhata
Aryabhata
, a mathematician–astronomer from the classical age of Indian mathematics and astronomy , also used a geocentric model to estimate Jupiter's period as 4332.2722 days, or 11.86 years.

GROUND-BASED TELESCOPE RESEARCH

In 1610, Galileo Galilei
Galileo Galilei
discovered the four largest moons of Jupiter (now known as the Galilean moons
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. 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
Inquisition
.

During the 1660s, Giovanni Cassini used a new telescope to discover spots and colorful bands on Jupiter
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. 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
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
Great Red Spot
in 1831.

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.

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
Jupiter
was on the opposite side of the Sun
Sun
from Earth, these events would occur about 17 minutes later than expected. Ole Rømer deduced that sight is not instantaneous (a conclusion that Cassini had earlier rejected), and this timing discrepancy was used to estimate the speed of light .

In 1892, E. E. Barnard observed a fifth satellite of Jupiter
Jupiter
with the 36-inch (910 mm) 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 . It was the last planetary moon to be discovered directly by visual observation. Infrared
Infrared
image of Jupiter
Jupiter
taken by ESO
ESO
's Very Large Telescope
Telescope

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

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
Oval
BA .

RADIOTELESCOPE RESEARCH

In 1955, Bernard Burke and Kenneth Franklin detected bursts of radio signals coming from Jupiter
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
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.

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. * 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. * Thermal radiation is produced by heat in the atmosphere of Jupiter.

EXPLORATION

Main article: Exploration of Jupiter

Since 1973 a number of automated spacecraft have visited Jupiter, most notably the Pioneer 10
Pioneer 10
space probe, the first spacecraft to get close enough to Jupiter
Jupiter
to send back revelations about the properties and phenomena of the Solar System's largest planet. Flights to other planets within the Solar System
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
Earth
to Jupiter
Jupiter
from low Earth
Earth
orbit requires a delta-v of 6.3 km/s which is comparable to the 9.7 km/s delta-v needed to reach low Earth
Earth
orbit. Fortunately, 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.

Flyby Missions

Perijove 6 pass of Jupiter
Jupiter
as viewed by JunoCam
JunoCam

Flyby missions SPACECRAFT Closest approach DISTANCE

Pioneer 10
Pioneer 10
December 3, 1973 130,000 km

Pioneer 11
Pioneer 11
December 4, 1974 34,000 km

Voyager 1 March 5, 1979 349,000 km

Voyager 2
Voyager 2
July 9, 1979 570,000 km

Ulysses February 8, 1992 408,894 km

February 4, 2004 120,000,000 km

Cassini December 30, 2000 10,000,000 km

New Horizons February 28, 2007 2,304,535 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.

Six years later, the Voyager missions vastly improved the understanding of the Galilean moons
Galilean moons
and discovered Jupiter's rings. They also confirmed that the Great Red Spot
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.

The next mission to encounter Jupiter
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. Cassini views Jupiter
Jupiter
and Io on January 1, 2001

In 2000, the Cassini probe flew by Jupiter
Jupiter
_en route_ to Saturn
Saturn
, and provided some of the highest-resolution images ever made of the planet.

The New Horizons probe flew by Jupiter
Jupiter
for gravity assist _en route_ to Pluto
Pluto
. Its closest approach was on February 28, 2007. The probe's cameras measured plasma output from volcanoes on Io and studied all four Galilean moons
Galilean moons
in detail, as well as making long-distance observations of the outer moons Himalia and Elara . Imaging of the Jovian system began September 4, 2006.

_Galileo_ Mission

Main article: Galileo (spacecraft) _ Jupiter
Jupiter
as seen by the space probe Cassini _

The first spacecraft to orbit Jupiter
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
Galilean moons
and Amalthea . The spacecraft also witnessed the impact of Comet Shoemaker–Levy 9 as it approached Jupiter
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_.

A 340-kilogram titanium atmospheric probe was released from the spacecraft in July 1995, entering Jupiter's atmosphere on December 7. It parachuted through 150 km (93 mi) of the atmosphere at a speed of about 2,575 km/h (1600 mph) and collected data for 57.6 minutes before it was crushed by the pressure of about 23 atmospheres at a temperature of 153 °C. 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 °C (>570 °F) and the windspeed measured more than 644 km/h (>400 mph) before the probes vapourised.

_Juno_ Mission

Main article: Juno (spacecraft)

NASA's _Juno_ mission arrived at Jupiter
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 . On August 27, 2016, the spacecraft completed its first fly-by of Jupiter
Jupiter
and sent back the first-ever images of Jupiter’s north pole.

Future Probes

The next planned mission to the Jovian system will be the European Space Agency 's Jupiter
Jupiter
Icy Moon
Moon
Explorer (JUICE), due to launch in 2022, followed by NASA's Europa Clipper mission in 2025.

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
Jupiter
Icy Moons Orbiter_) was cancelled in 2005. A subsequent proposal was developed for a joint NASA
NASA
/ ESA
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 . However, ESA
ESA
had formally ended the partnership by April 2011, citing budget issues at NASA
NASA
and the consequences on the mission timetable. Instead, ESA
ESA
planned to go ahead with a European-only mission to compete in its L1 Cosmic Vision
Cosmic Vision
selection.

MOONS

_ Wikimedia Commons has media related to MOONS OF JUPITER _.

Main article: Moons of Jupiter See also: Timeline of discovery of Solar System
Solar System
planets and their moons

Jupiter
Jupiter
has 69 known natural satellites . Of these, 53 are less than 10 kilometres in diameter and have only been discovered since 1975. The four largest moons, visible from Earth
Earth
with binoculars on a clear night, known as the " Galilean moons
Galilean moons
", are Io, Europa, Ganymede, and Callisto.

GALILEAN MOONS

Main article: Galilean moons
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.

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).

The Galilean moons, compared to Earth's Moon
Moon
NAME IPA DIAMETER MASS ORBITAL RADIUS ORBITAL PERIOD

KM % KG % KM % DAYS %

IO /ˈaɪ.oʊ/ 3,643 105 8.9×1022 120 421,700 110 1.77 7

EUROPA /jʊˈroʊpə/ 3,122 90 4.8×1022 65 671,034 175 3.55 13

GANYMEDE /ˈɡænimiːd/ 5,262 150 14.8×1022 200 1,070,412 280 7.15 26

CALLISTO /kəˈlɪstoʊ/ 4,821 140 10.8×1022 150 1,882,709 490 16.69 61

The Galilean moons
Galilean moons
Io , Europa , Ganymede , 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.

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
Galilean moons
These four moons, discovered by Galileo Galilei
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

Themisto This is a single moon belonging to a group of its own, orbiting halfway between the Galilean moons
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 Another isolated case; at the inner edge of the Ananke group, it orbits Jupiter
Jupiter
in prograde direction.

Ananke group This retrograde orbit group has rather indistinct borders, averaging 21,276,000 km from Jupiter
Jupiter
with an average inclination of 149 degrees.

Carme group A fairly distinct retrograde group that averages 23,404,000 km from Jupiter
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

The rings of Jupiter
Jupiter
Main article: Rings of Jupiter

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. 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
Jupiter
because of its strong gravitational influence. The orbit of the material veers towards Jupiter
Jupiter
and new material is added by additional impacts. 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.

INTERACTION WITH THE SOLAR SYSTEM

Along with the Sun, the gravitational influence of Jupiter
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
Late Heavy Bombardment
of the inner Solar System's history. This diagram shows the Trojan asteroids in Jupiter's orbit, as well as the main asteroid belt .

Along with its moons, Jupiter's gravitational field controls numerous asteroids that have settled into the regions of the Lagrangian points preceding and following Jupiter
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
Iliad
_. The first of these, 588 Achilles , was discovered by Max Wolf in 1906; since then more than two thousand have been discovered. The largest is 624 Hektor .

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

Due to the magnitude of Jupiter's mass, the center of gravity between it and the Sun
Sun
lies just above the Sun's surface. Jupiter
Jupiter
is the only body in the Solar System
Solar System
for which this is true.

IMPACTS

See also: Comet Shoemaker–Levy 9 , 2009 Jupiter impact event , and 2010 Jupiter impact event Hubble image taken on July 23, 2009, showing a blemish of about 5,000 miles (8,000 km) long left by the 2009 Jupiter
Jupiter
impact .

Jupiter
Jupiter
has been called the Solar System's vacuum cleaner, 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. It was thought that the planet served to partially shield the inner system from cometary bombardment. However, recent computer simulations suggest that Jupiter
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. This topic remains controversial among scientists, as some think it draws comets towards Earth
Earth
from the Kuiper belt
Kuiper belt
while others think that Jupiter
Jupiter
protects Earth
Earth
from the alleged Oort cloud . Jupiter
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.

More recent discoveries include the following:

* A fireball was photographed by Voyager 1 during its Jupiter encounter in March 1979. * 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. * On July 19, 2009, an impact site was discovered at approximately 216 degrees longitude in System 2. This impact left behind a black spot in Jupiter's atmosphere, similar in size to Oval
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. * 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
Philippines
. * Yet another fireball was seen on August 20, 2010. * On September 10, 2012, another fireball was detected. * On March 17, 2016 an asteroid or comet struck and was filmed on video.

MYTHOLOGY

_ Jupiter, woodcut from a 1550 edition of Guido Bonatti 's Liber Astronomiae_

The planet Jupiter
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
Sun
is low. 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 .

The Romans named it after Jupiter
Jupiter
(Latin : _Iuppiter, Iūpiter_) (also called Jove), 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"). In turn, Jupiter
Jupiter
was the counterpart to the mythical Greek _ Zeus
Zeus
_ (Ζεύς), also referred to as _Dias_ (Δίας), the planetary name of which is retained in modern Greek .

The astronomical symbol for the planet, _ , 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 _zenographic_.

_Jovian_ is the adjectival form of Jupiter. The older adjectival form _jovial_, employed by astrologers in the Middle Ages
Middle Ages
, has come to mean "happy" or "merry", moods ascribed to Jupiter\'s astrological influence .

The Chinese, Koreans and Japanese called it the "wood star" (Chinese : 木星; pinyin : _mùxīng_), based on the Chinese Five Elements . Chinese Taoism personified it as the Fu star . The Greeks called it Φαέθων, _Phaethon_, "blazing". In Vedic astrology , Hindu astrologers named the planet after Brihaspati , the religious teacher of the gods, and often called it " Guru
Guru
", which literally means the "Heavy One".

In Germanic mythology , Jupiter
Jupiter
is equated to Thor
Thor
, whence the English name _Thursday_ for the Roman _dies Jovis_.

In the Central Asian-Turkic myths , Jupiter
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
Jupiter
as 11 years and 300 days. They believed that some social and natural events connected to Erentüz's movements on the sky.

SEE ALSO

* Jupiter
Jupiter
portal * Solar System
Solar System
portal

* Book: Jupiter
Jupiter
* Book: Solar System
Solar System

* Outline of Jupiter * HIP 11915 – A solar analog approximately 186 light-years from Earth, whose planetary system contains a Jupiter
Jupiter
analog, HIP 11915 b * Hot Jupiter * Jovian–Plutonian gravitational effect * Jovian (fiction) * Jupiter in fiction * Space exploration

NOTES

* ^ This image was taken by the Hubble Space Telescope
Telescope
, using the Wide Field Camera 3
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
Great Red Spot
, featured prominently in the lower right of the image, and the planet's recognizable banded appearance. * ^ _A_ _B_ _C_ _D_ _E_ _F_ _G_ Refers to the level of 1 bar atmospheric pressure * ^ Based on the volume within the level of 1 bar atmospheric pressure

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FURTHER READING

* Bagenal, F.; Dowling, T. E.; McKinnon, W. B., eds. (2004). _Jupiter: The planet, satellites, and magnetosphere_. Cambridge: Cambridge University
Cambridge University
Press. ISBN 0-521-81808-7 . * Beebe, Reta (1997). _Jupiter: The Giant Planet_ (Second ed.). Washington, D.C.: Smithsonian Institution Press. ISBN 1-56098-731-6 . * Gore, Rick (January 1980). "What Voyager Saw: Jupiter's Dazzling Realm". _National Geographic _. Vol. 157 no. 1. pp. 2–30. ISSN 0027-9358 . OCLC
OCLC
643483454 .

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