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|Aphelion||816.62 Gm (5.4588 AU)|
|Perihelion||740.52 Gm (4.9501 AU)|
|778.57 Gm (5.2044 AU)|
Average orbital speed
|13.07 km/s (8.12 mi/s)|
|21 January 2023|
|Known satellites||92 (as of 2023[update]) |
|69,911 km (43,441 mi)[b]
|1,326 kg/m3 (2,235 lb/cu yd)[c]|
|24.79 m/s2 (81.3 ft/s2)[b]|
|59.5 km/s (37.0 mi/s)[b]|
|9.9258 h (9 h 55 m 33 s)|
Sidereal rotation period
|9.925 hours (9 h 55 m 30 s)|
Equatorial rotation velocity
|12.6 km/s (7.8 mi/s; 45,000 km/h)|
|3.13° (to orbit)|
North pole right ascension
|268.057°; 17h 52m 14s|
North pole declination
|−2.94 to −1.66|
|29.8" to 50.1"|
|200–600 kPa (opaque cloud deck)|
|27 km (17 mi)|
|Composition by volume|
Jupiter is the largest planet in the Solar System.[d] It is the fifth planet from the Sun. Jupiter is a gas giant, because it is so large and made of gas. The other gas giants are Saturn, Uranus, and Neptune.
Jupiter's mass is 1.8986×1027 kg, or about 318 times the mass of Earth. This is more than twice the mass of all the other planets in the Solar System put together.
Jupiter can be seen even without using a telescope. The ancient Romans named the planet after their King of Gods, Jupiter (Latin: Iuppiter). Jupiter is the third brightest object in the night sky. Only the Earth's moon and Venus are brighter.
Jupiter has 92 moons. About 72 of them are very small—less than five kilometres wide. The four largest moons of Jupiter are Io, Europa, Ganymede, and Callisto. They are called the Galilean moons, because Galileo Galilei discovered them. Ganymede is the largest moon in the Solar System. Its diameter is larger than that of the planet Mercury.
The orbits of Jupiter and Saturn are further from the Sun that expected. This is discussed below under "Grand Tack hypothesis".
Name and symbol[change | change source]
Jupiter was named for the king of the gods. The Greeks called him Zeus. The Romans called him Jupiter. The symbol for Jupiter, , is from the Greek zeta. It has a horizontal stroke⟨Ƶ⟩. This stands as an abbreviation for Zeus.
Structure[change | change source]
Jupiter is the biggest planet in the Solar System. Its diameter is 142,984 km. This is eleven times larger than the diameter of the Earth.
Atmosphere[change | change source]
The atmosphere near the surface of Jupiter is about 88 to 92% hydrogen, 8 to 12% helium, and 1% other gases.
The lower atmosphere is so heated and the pressure so high that helium changes to liquid. It rains down onto the planet. Based on spectroscopy, Jupiter seems to be made of the same gases as Saturn. It is different from Neptune or Uranus. Those two planets have much less hydrogen and helium gas.
Core[change | change source]
The very high temperatures and pressures in Jupiter's core mean scientists cannot tell what materials are there. This cannot be found out, because it is not possible to create the same amount of pressure on Earth.
Above the unknown inner core is an outer core. The outer core of Jupiter is thick, liquid hydrogen. The pressure is high enough to make the hydrogen solid, but then it melts because of the heat.
The planet Jupiter is sometimes called a failed star because it is made of the same elements (hydrogen and helium) as is the Sun, but it is not large enough to have the internal pressure and temperature necessary to cause hydrogen to fuse to helium, the energy source that powers the sun and most other stars.
Mass[change | change source]
Jupiter is twice as massive as all the other planets in the Solar System put together. It gives off more heat than it gets from the Sun. Jupiter is 11 times the width of Earth and 318 times as massive. The volume of Jupiter is 1,317 times the volume of Earth. In other words, 1,317 Earth-sized objects could fit inside it.
Cloud layers[change | change source]
Jupiter has many bands of clouds going horizontally across its surface. The light parts are zones and the darker are belts. The zones and belts often interact with each other. This causes huge storms. Wind speeds of 360 kilometres per hour (km/h) are common on Jupiter. To show the difference the strongest tropical storms on Earth are about 100 km/h.
Most of the clouds on Jupiter are made of ammonia. There may also be clouds of water vapor like clouds on Earth. Spacecrafts such as Voyager 1 have seen lightning on the surface of the planet. Scientists think it was water vapor because lightning needs water vapor. These lightning bolts have been measured as up 1,000 times as powerful as those on Earth. The brown and orange colors are caused when sunlight passes through or refracts with the many gases in the atmosphere.
Great Red Spot[change | change source]
One of the biggest features in Jupiter's atmosphere is the Great Red Spot. It is a huge storm which is bigger than the entire Earth. It is on record since at least 1831, and as early as 1665. Images by the Hubble Space Telescope have shown as many as two smaller "red spots" next to the Great Red Spot. Storms can last for hours or as long as hundreds of years in the case of the Great Red Spot.
Magnetic field[change | change source]
Jupiter has a magnetic field like Earth's but 11 times stronger. It also has a magnetosphere much bigger and stronger than Earth's. The field traps radiation belts much stronger than Earth's Van Allen radiation belts, strong enough to endanger any spacecraft travelling near. The magnetic field is probably caused by the large amounts of liquid metallic hydrogen in the core of Jupiter. The four largest moons of Jupiter and many of the smaller ones orbit or go around the planet within the magnetic field. This protects them from the solar wind. Jupiter's magnetic field is so large, it reaches the orbit of Saturn 7.7 million miles (12 million km) away. The Earth's magnetosphere does not even cover its moon, less than a quarter of a million miles (400,000 km) away. Jupiter also experiences large aurorae, which happen when charged particles from the volcanic moon Io land in its atmosphere.
Ring system[change | change source]
Jupiter also has a thin planetary ring system. These rings are difficult to see and were not discovered until 1979 by NASA's Voyager 1 probe. There are four parts to Jupiter's rings. The closest ring to Jupiter is called the Halo Ring. The next ring is called the Main Ring. It is about 6,440 km (4,002 mi) wide and only 30 km (19 mi) thick. The Main and Halo rings of Jupiter are made of small, dark particles. The third and fourth rings, called the Gossamer Rings, are transparent (see through) and are made from microscopic debris and dust. This dust probably comes from small meteors striking the surface of Jupiter's moons. The third ring is called the Amalthea Gossamer Ring, named after moon Amalthea. The outer ring, the Thebe Gossamer Ring, is named after the moon Thebe. The outer edge of this ring is about 220,000 km (136,702 mi) from Jupiter.
Orbit[change | change source]
The orbit of a planet is the time and path it takes to go around the Sun. In the amount of time it takes for Jupiter to orbit the Sun one time, the Earth orbits the Sun 11.86 times. One year on Jupiter is equal to 11.86 years on Earth. The average distance between Jupiter and the Sun is 778 million kilometres. This is five times the distance between Earth and the Sun. Jupiter is not tilted on its axis as much as Earth or Mars. This causes it to have no seasons, for example summer or winter. Jupiter rotates, or spins around very quickly. This causes the planet to bulge in the middle. Jupiter is the fastest spinning planet in the Solar System. It completes one rotation or spin in 10 hours. Because of the bulge, the length of the equator of Jupiter is much longer than the length from pole to pole.
Grand tack hypothesis[change | change source]
The orbit of Jupiter is unusual among star systems. It is usual for giant planets to be much nearer to their stars. Because it is not, it suggests an unusual explanation is needed for the arrangement of the planets in the Solar System.
- "Over the eons, the giant planet roamed toward the center of the Solar System and back out again, at one point moving in about as close as Mars is now. The planet's travels profoundly influenced the Solar System, changing the nature of the asteroid belt and making Mars smaller than it should have been...
- "Like Jupiter, Saturn got drawn toward the Sun shortly after it formed, and the model holds that once the two massive planets came close enough to each other, their fates became permanently linked. Gradually, all the gas in between the two planets got expelled, bringing their Sun-bound death spiral to a halt and eventually reversing the direction of their motion. The two planets journeyed outward together until Jupiter reached its current position at 5.2 astronomical units and Saturn came to rest at about 7 astronomical units. Later, other forces pushed Saturn out to 9.5 astronomical units, where it is today".
These details are based on a new model of the early Solar System developed by an international team that includes NASA's Goddard Space Flight Center in Greenbelt, Md.
Research and exploration[change | change source]
From Earth[change | change source]
Jupiter is the third brightest object in the night sky, after the Moon and Venus. The first person known to really study the planet was Galileo Galilei in 1610. He was the first person to see Jupiter's moons Io, Europa, Ganymede and Callisto. This was because he used a telescope, unlike anyone before him.
No new moons were discovered for more than two hundred years. In 1892, astronomer E.E Barnard found a new moon using his observatory in California. He called the moon Amalthea. It was the last of Jupiter's 67 moons to be discovered by human observation through a telescope. In 1994, bits of the comet Shoemaker Levy-9 hit Jupiter. It was the first time people saw a collision between two Solar System objects.
From spacecraft[change | change source]
Seven spacecraft have flown past Jupiter since 1973. These were Pioneer 10 (1973), Pioneer 11 (1974), Voyagers 1 and 2 (1979), Ulysses (1992 and 2004), Cassini (2000) and New Horizons (2007). Two spacecraft have been brought into orbit around Jupiter. These were Galileo (1995) and Juno (2011).
The Pioneer missions were the first spacecraft to take close up pictures of Jupiter and its moons. Five years later, the two Voyager spacecraft discovered three new moons. They captured photo evidence of lightning on the night side of Jupiter.
The Ulysses probe was sent to study the Sun. It only went to Jupiter after it had finished its main mission. Ulysses had no cameras so it took no photographs. In 2006, the Cassini spacecraft, on its way to Saturn, took some very good, very clear pictures of the planet. Cassini also found a moon and took a picture of it but it was too far away to show the details.
The Galileo mission in 1995 was the first spacecraft to go into orbit around Jupiter. It flew around the planet for seven years and studied the four biggest moons. It launched a probe into the planet to get information about Jupiter's atmosphere. The probe travelled to a depth of about 150 km before it was crushed by the pressure of all the gas above it. The Galileo spacecraft was also crushed in 2003 when NASA steered the craft into the planet. They did this so that the craft could not crash into Europa, a moon which scientists think might have life.
NASA have sent another spacecraft to Jupiter called Juno. It was launched on August 5, 2011 and arrived at Jupiter on July 4, 2016. NASA published some results from the Juno mission in March 2018. Several other missions have been planned to send spacecraft to Jupiter's moons Europa and Callisto. One called JIMO (Jupiter Icy Moons Orbiter) was cancelled in 2006 because it cost too much money.
Moons[change | change source]
Jupiter has 92 known moons. The four largest were seen by Galileo with his primitive telescope, and nine more can be seen with modern telescopes. Three moons were identified by the Voyager spacecraft. All other moons were first seen on Earth, using modern telescopes and advanced photography methods. The rest of the moons have been identified by spacecraft. The smallest moons (S/2003 J 12) is only one kilometre across. The largest, Ganymede, has a diameter of 5,262 kilometres. It is bigger than the planet Mercury. The other three Galilean moons are Io, Europa and Callisto. Because of the way they orbit Jupiter, gravity affects three of these moons greatly. The friction caused by the gravity of Europa and Ganymede pulling on Io makes it the most volcanic object in the Solar System. It has over 400 volcanoes, more than three times as many as Earth.
Jupiter in the Solar System[change | change source]
The grand tack hypothesis is that Jupiter disturbed all the inner planets before moving out to its present position. The following account is about its present position.
Jupiter's large gravity has had an effect on the Solar System. Jupiter protects the inner planets from comets by pulling them towards itself. Because of this, Jupiter has the most comet impacts in the Solar System.
Two groups of asteroids, called Trojan asteroids, have settled into Jupiter's orbit round the Sun. One group is called the Trojans and the other group is called the Greeks. They go around the Sun at the same time as Jupiter.
Related pages[change | change source]
References[change | change source]
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It is now possible to trace the medieval symbols for at least four of the five planets to forms that occur in some of the latest papyrus horoscopes ([ P.Oxy. ] 4272, 4274, 4275 [...]). That for Jupiter is an obvious monogram derived from the initial letter of the Greek name.
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- ↑ Wright, Alison (August 1, 2011). "Planetary science: The Trojan is out there". Nature Physics. 7 (8): 592. Bibcode:2011NatPh...7..592W. doi:10.1038/nphys2061. Archived from the original on 2020-05-31. Retrieved 2011-08-12.
- ↑ Robutel P. & Souchay J. 2010. "An introduction to the dynamics of trojan asteroids", in Dvorak, Rudolf & Souchay, Jean Dynamics of small Solar System bodies and exoplanets. Lecture Notes in Physics, 790, Springer. p197 ISBN 3642044573
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