mirrored file at http://SaturnianCosmology.Org/ For complete access to all the files of this collection see http://SaturnianCosmology.org/search.php ========================================================== [1][LINK] [2]Home [3]Table of Contents [4]What's New [5]Image Index [6]Copyright [7]Puzzles [8]Shopping [9]Search [10]Planet Jupiter _Jupiter_ _Then felt I like some watcher of the skies when a new planet swims into his ken. - John Keats_ Table of Contents Jupiter Introduction[11]Jupiter Statistics [12]Animations of Jupiter [13]Views of Jupiter [14]Rings of Jupiter [15]Jupiter's Moon Summary Satellites of Jupiter [16]Adrastea, [17]Amalthea, [18]Ananke, [19]Callisto, [20]Carme, [21]Elara, [22]Europa, [23]Ganymede, [24]Himalia, [25]Io, [26]Leda, [27]Lysithea, [28]Metis, [29]Pasiphae, [30]Sinope, [31]Thebe, Jupiter Science [32]Jupiter Exploration Chronology[33]Jupiter Science Summary[34]Galileo to Jupiter[35]Galilean Satellite Discovery[36]Jupiter Image/Animation Gallery[37]Planetary Icosahedrons[38]Comet Shoemaker-Levy 9 Background[39]Comet Shoemaker-Levy 9 Impact Galileo Press Releases [40]New Insites into Callisto and Europa - 23 May 1997[41]Ice Volcanoes Reshape Europa's Chaotic Surface - January 17, 1997[42]New Discoveries From Galileo - December 12, 1996[43]Jupiter's Europa Harbors Possible "Warm Ice" or Liquid Water[44]New Galileo Images Of Europa[45]Galileo Probe Suggests Planetary Science Reappraisal Other Resources [46]Jupiter's Ring System[47]Galileo Mission to Jupiter[48]Comet Shoemaker-Levy 9 Impact [49]The NASA Atlas of the Solar System, by Ronald Greeley, Geological Survey, $108.50 Hardcover - 1996 [50]The Great Comet Crash, by John R. Spencer, $25.95 Hardcover - 1995 [51]Impact Jupiter, by David Levy, $18.17 Hardcover - 1995 [52]Destination: Jupiter, by Seymour Jupiter Simon, $11.20 Hardcover - 1998 [53]Jupiter: The Giant Planet, by Reta Beebe, $29.95 Hardcover - 1997 [54][LINK] Jupiter is the fifth planet from the Sun and is the largest one in the solar system. If Jupiter were hollow, more than one thousand Earths could fit inside. It also contains more matter than all of the other planets combined. It has a mass of 1.9 x 1027 kg and is 142,800 kilometers (88,736 miles) across the equator. Jupiter possesses 28 know satellites, four of which - Callisto, Europa, Ganymede and Io - were observed by [55]Galileo as long ago as 1610. Another 12 satellites have been recently discovered and given provisional designators until they are officially confirmed and named. There is a ring system, but it is very faint and is totally invisible from the Earth. (The rings were discovered in 1979 by Voyager 1.) The atmosphere is very deep, perhaps comprising the whole planet, and is somewhat like the Sun. It is composed mainly of hydrogen and helium, with small amounts of methane, ammonia, water vapor and other compounds. At great depths within Jupiter, the pressure is so great that the hydrogen atoms are broken up and the electrons are freed so that the resulting atoms consist of bare protons. This produces a state in which the hydrogen becomes metallic. Colorful latitudinal bands, atmospheric clouds and storms illustrate Jupiter's dynamic weather systems. The cloud patterns change within hours or days. The [56]Great Red Spot is a complex storm moving in a counter-clockwise direction. At the outer edge, material appears to rotate in four to six days; near the center, motions are small and nearly random in direction. An array of other smaller storms and eddies can be found through out the banded clouds. [57]Auroral emissions, similar to Earth's [58]northern lights, were observed in the polar regions of Jupiter. The auroral emissions appear to be related to material from [59]Io that spirals along magnetic field lines to fall into Jupiter's atmosphere. Cloud-top lightning bolts, similar to superbolts in Earth's high atmosphere, were also observed. Jupiter's Ring Unlike Saturn's intricate and complex ring patterns, Jupiter has a simple ring system that is composed of an inner halo, a main ring and a Gossamer ring. To the Voyager spacecraft, the Gossamer ring appeared to be a single ring, but Galileo imagery provided the unexpected discovery that Gossamer is really two rings. One ring is embedded within the other. The rings are very tenuous and are composed of dust particles kicked up as interplanetary meteoroids smash into Jupiter's four small inner moons [60]Metis, [61]Adrastea, [62]Thebe, and [63]Amalthea. Many of the particles are microscopic in size. The innermost halo ring is toroidal in shape and extends radially from about 92,000 kilometers (57,000 miles) to about 122,500 kilometers (76,000 miles) from Jupiter's center. It is formed as fine particles of dust from the main ring's inner boundary 'bloom' outward as they fall toward the planet. The main and brightest ring extends from the halo boundary out to about 128,940 kilometers (80,000 miles) or just inside the orbit of Adrastea. Close to the orbit of Metis, the main ring's brightness decreases. The two faint Gossamer rings are fairly uniform in nature. The innermost Amalthea Gossamer ring extends from the orbit of Adrastea out to the orbit of Amalthea at 181,000 kilometers (112,000 miles) from Jupiter's center. The fainter Thebe Gossamer ring extends from Amalthea's orbit out to about Thebe's orbit at 221,000 kilometers (136,000 miles). Jupiter's rings and moons exist within an intense radiation belt of electrons and ions trapped in the planet's magnetic field. These particles and fields comprise the jovian [64]magnetosphere or magnetic environment, which extends 3 to 7 million kilometers (1.9 to 4.3 million miles) toward the Sun, and stretches in a windsock shape at least as far as Saturn's orbit - a distance of 750 million kilometers (466 million miles). Jupiter Statistics Mass (kg) 1.900e+27 Mass (Earth = 1) 3.1794e+02 Equatorial radius (km) 71,492 Equatorial radius (Earth = 1) 1.1209e+01 Mean density (gm/cm^3) 1.33 Mean distance from the Sun (km) 778,330,000 Mean distance from the Sun (Earth = 1) 5.2028 Rotational period (days) 0.41354 Orbital period (days) 4332.71 Mean orbital velocity (km/sec) 13.07 Orbital eccentricity 0.0483 Tilt of axis (degrees) 3.13 Orbital inclination (degrees) 1.308 Equatorial surface gravity (m/sec^2) 22.88 Equatorial escape velocity (km/sec) 59.56 Visual geometric albedo 0.52 Magnitude (Vo) -2.70 Mean cloud temperature -121°C Atmospheric pressure (bars) 0.7 Atmospheric composition Hydrogen Helium 90% 10% Animations of Jupiter * [65]Rotating Jupiter Movie. * [66]Io Fly Around. * [67]Rotating Jupiter and its Atmosphere. * [68]Jupiter's Atmosphere. * [69]Jupiter's Redspot. * [70]Magnetic Field of Jupiter. Views of Jupiter [71]Jupiter [72]Jupiter This image was taken by NASA's Hubble Space Telescope on February 13, 1995. The image provides a detailed look at a unique cluster of three white oval-shaped storms that lie southwest (below and to the left) of Jupiter's Great Red Spot. The appearance of the clouds, in this image, is considerably different from their appearance only seven months earlier. These features are moving closer together as the Great Red Spot is carried westward by the prevailing winds while the white ovals are swept eastward. The outer two of the white storms formed in the late 1930s. In the centers of these cloud systems the air is rising, carrying fresh ammonia gas upward. New, white ice crystals form when the upwelling gas freezes as it reaches the chilly cloud top level where temperatures are -130°C (-200°F). The intervening white storm center, the ropy structure to the left of the ovals, and the small brown spot have formed in low pressure cells. The white clouds sit above locations where gas is descending to lower, warmer regions. [73]The Interior of Jupiter [74]The Interior of Jupiter This picture illustrates the internal structure of Jupiter. The outer layer is primarily composed of molecular hydrogen. At greater depths the hydrogen starts resembling a liquid. At 10,000 kilometers below Jupiter's cloud top liquid hydrogen reaches a pressure of 1,000,000 bar with a temperature of 6,000° K. At this state hydrogen changes into a phase of liquid metallic hydrogen. In this state, the hydrogen atoms break down yeilding ionized protons and electrons similar to the Sun's interior. Below this is a layer dominated by ice where "ice" denotes a soupy liquid mixture of water, methane, and ammonia under high temperatures and pressures. Finally at the center is a rocky or rocky-ice core of up to 10 Earth masses. _(Copyright Calvin J. Hamilton)_ [75]Crescent Image of Jupiter [76]Thin Crescent Image of Jupiter This thin crescent picture of Jupiter was created from a photomosaic of images Galileo took on its C9 orbit. It is made from Near Infrared and Violet images, with an artificial green image produced from the other two. _(Courtesy of Ted Stryk)_ [77]Telescope Image of Jupiter [78]Nordic Optical Telescope This image of Jupiter was taken with the 2.6 meter [79]Nordic Optical Telescope, located at La Palma, Canary Islands. It is a good example of the best imagery that can be obtained from earth based telescopes. (c) Nordic Optical Telescope Scientific Association (NOTSA). [80]Jupiter, Io, & Europa [81]Jupiter with Satellites Io and Europa [82]Voyager 1 took this photo of Jupiter and two of its satellites ([83]Io, left, and [84]Europa, right) on Feb. 13, 1979. In this view, Io is about 350,000 kilometers (220,000 miles) above Jupiter's Great Red Spot, while Europa is about 600,000 kilometers (373,000 miles) above Jupiter's clouds. Jupiter is about 20 million kilometers (12.4 million miles) from the spacecraft at the time of this photo. There is evidence of circular motion in Jupiter's atmosphere. While the dominant large scale motions are west-to-east, small scale movement includes eddy like circulation within and between the bands. _(Courtesy NASA/JPL)_ [85]Jupiter Aurora [86]Satellite Footprints Seen in Jupiter Aurora In this Hubble Space Telescope picture, a curtain of glowing gas is wrapped around Jupiter's north pole like a lasso. This curtain of light, called an aurora, is produced when high-energy electrons race along the planet's magnetic field and into the upper atmosphere where they excite atmospheric gases, causing them to glow. The aurora resembles the same phenomenon that crowns Earth's polar regions. But this Hubble image, taken in ultraviolet light, also shows the glowing "footprints" of three of Jupiter's largest moons: Io, Ganymede, and Europa. _Courtesy of NASA/ESA, John Clarke (University of Michigan)_ [87]Jupiter's Magnetosphere [88]Jupiter's Magnetosphere This image taken by the ion and neutral mass spectrometer instrument on NASA's Cassini spacecraft makes the huge magnetosphere surrounding Jupiter visible in a way no instrument on any previous spacecraft has been able to do. The magnetosphere is a bubble of charged particles trapped within the magnetic environment of the planet. A magnetic field is sketched over the image to place the energetic neutral atom emissions in perspective. This sketch extends in the horizontal plane to a width 30 times the radius of Jupiter. Also shown for scale and location are the disk of Jupiter (black circle) and the approximate position (yellow circles) of the doughnut-shaped torus created from material spewed out by volcanoes on [89]Io. Some of the fast-moving ions within the magnetosphere pick up electrons to become neutral atoms, and once they become neutral, they can escape Jupiter's magnetic field, flying out from the magnetosphere at speeds of thousands of kilometers, or miles, per second. [90]Jupiter's Aurora [91]Jupiter's Auroras These HST images, reveal changes in Jupiter's auroral emissions and how small auroral spots just outside the emission rings are linked to the planet's volcanic moon, [92]Io. The top panel pinpoints the effects of emissions from Io. The image on the left, shows how Io and Jupiter are linked by an invisible electrical current of charged particles called a _flux tube._ The particles, ejected from Io by volcanic eruptions, flow along Jupiter's magnetic field lines, which thread through Io, to the planet's north and south magnetic poles. The top-right image shows Jupiter's auroral emissions at the north and south poles. Just outside these emissions are the auroral spots called "footprints." The spots are created when the particles in Io's "flux tube" reach Jupiter's upper atmosphere and interact with hydrogen gas, making it fluoresce. The two ultraviolet images at the bottom of the picture show how the auroral emissions change in brightness and structure as Jupiter rotates. These false-color images also reveal how the magnetic field is offset from Jupiter's spin axis by 10 to 15 degrees. In the right image, the north auroral emission is rising over the left limb; the south auroral oval is beginning to set. The image on the left, obtained on a different date, shows a full view of the north aurora, with a strong emission inside the main auroral oval. _Credits: John T. Clarke and Gilda E. Ballester (University of Michigan), John Trauger and Robin Evans (Jet Propulsion Laboratory), and NASA._ [93]The Great Red Spot [94]The Great Red Spot This dramatic view of Jupiter's Great Red Spot and its surroundings was obtained by Voyager 1 on Feb. 25, 1979, when the spacecraft was 9.2 million kilometers (5.7 million miles) from Jupiter. Cloud details as small as 160 kilometers (100 miles) across can be seen here. The colorful, wavy cloud pattern to the left of the Red Spot is a region of extraordinarily complex and variable wave motion. _(Courtesy NASA)_ [95]The Great Red Spot [96]False Color of Jupiter's Great Red Spot This image is a false color representation of Jupiter's Great Red Spot taken with Galileo's imaging system through three different near-infrared filters. This is a mosaic of eighteen images (6 in each filter) that were taken over a period of 6 minutes on June 26, 1996. The Great Red Spot appears pink and the surrounding region blue because of the particular color coding used in this representation. The red channel is the reflectance of Jupiter at a wavelength where methane strongly absorbs (889nm). Because of this absorption, only high clouds can reflect sunlight in this wavelength. The green channel is the reflectance in a wavelength where methane absorbs, but less strongly (727nm). Lower clouds can reflect sunlight in this wavelength. Finally, the blue channel is the reflectance in a wavelength where there are essentially no absorbers in the Jovian atmosphere (756nm) and one sees light reflected from the deepest clouds. Thus, the color of a cloud in this image indicates its height, with red or white being highest and blue or black being lowest. This image shows the Great Red Spot to be relatively high, as are some smaller clouds to the northeast and northwest that are surprisingly like towering thunderstorms found on earth. The deepest clouds are in the collar surrounding the Great Red Spot, and also just to the northwest of the high (bright) cloud in the northwest corner of the image. Preliminary modelling shows these cloud heights to range about 50km in altitude. _(Courtesy NASA/JPL)_ [97]Ring of Jupiter [98]Ring of Jupiter The ring of Jupiter was discovered by Voyager 1 in March of 1979. This image was taken by Voyager 2 and has been pseudo colored. The Jovian ring is about 6,500 kilometers (4,000 miles) wide and probably less than 10 kilometers (6.2 miles) thick. _(Copyright Calvin J. Hamilton)_ [99]The Jovian System [100]The Jovian System The best of the Jupiter system is pictured in this collage of images acquired by the Voyager and Galileo spacecraft. Jupiter is the largest planet in our solar system. The four largest moons of Jupiter are known as the Galilean moons and are named [101]Callisto, [102]Ganymede, [103]Europa, and [104]Io. Inside the orbits of the Galilean moons are [105]Thebe, [106]Amalthea, [107]Adrastea, and [108]Metis. At the lower right is shown the Valhalla region of Callisto. Ganymede is toward the bottom middle. Europa is a little above and to the right of Ganymede. Io is the top, left-most moon. Between Io and Jupiter are four little moons. The top-most little moon is Amalthea. Below and to the right of Amalthea are Metis and Adrastea. To the left of Adrastea is Thebe. _(Copyright Calvin J. Hamilton)_ [109]Moons of Jupiter [110]Moons of Jupiter This image shows to scale Jupiter's moons [111]Amalthea, [112]Io, [113]Europa, [114]Ganymede, and [115]Callisto. _(Copyright Calvin J. Hamilton)_ Rings of Jupiter Name Distance* Width Thickness Mass Albedo Halo 92,000 km 30,500 km 20,000 km ? 0.05 Main 122,500 km 6,440 km < 30 km 1 x 10^13 kg 0.05 Inner Gossamer 128,940 km 52,060 km ? ? 0.05 Outer Gossamer 181,000 km 40,000 km ? ? 0.05 *The distance is measured from the planet center to the start of the ring. Jupiter's Moon Summary Nearly four centuries ago Galileo Galilei turned his homemade telescope towards the heavens and discovered three points of light, which at first he thought to be stars, hugging the planet Jupiter. These stars were arranged in a straight line with Jupiter. Sparking his interest, Galileo observed the stars and found that they moved the wrong way. Four days later another star appeared. After observing the stars over the next few weeks, Galileo concluded that they were not stars but planetary bodies in orbit around Jupiter. These four stars have come to be know as the [116]Galilean satellites. Over the course of the following centuries another 12 moons were discovered bringing the total to 16. Another 12 satellites have been recently discovered and given provisional designators until they are officially confirmed and named. Finally in 1979, the strangeness of these frozen new worlds was brought to light by the Voyager spacecrafts as they swept past the Jovian system. Again in 1996, the exploration of these worlds took a large step forward as the Galileo spacecraft began its long term mission of observing Jupiter and its moons. Twelve of Jupiter's moons are relatively small and seem to have been more likely captured than to have been formed in orbit around Jupiter. The four large Galilean moons, [117]Io, [118]Europa, [119]Ganymede and [120]Callisto, are believed to have [121]accreted as part of the process by which Jupiter itself formed. The following table summarizes the radius, mass, distance from the planet center, discoverer and the date of discovery of each of the moons of Jupiter: Moon # Radius (km) Mass (kg) Distance (km) Discoverer Date [122]Metis XVI 20 9.56e+16 127,969 S. Synnott 1979 [123]Adrastea XV 12.5x10x7.5 1.91e+16 128,971 Jewitt-Danielson 1979 [124]Amalthea V 135x84x75 7.17e+18 181,300 [125]E. Barnard 1892 [126]Thebe XIV 55x45 7.77e+17 221,895 S. Synnott 1979 [127]Io I 1,815 8.94e+22 421,600 [128]Marius-[129]Galileo 1610 [130]Europa II 1,569 4.80e+22 670,900 Marius-Galileo 1610 [131]Ganymede III 2,631 1.48e+23 1,070,000 Marius-Galileo 1610 [132]Callisto IV 2,400 1.08e+23 1,883,000 Marius-Galileo 1610 S/1975 J1 S/2000 J1 4 ? 7,435,000 Sheppard et al 2000 [133]Leda XIII 8 5.68e+15 11,094,000 [134]C. Kowal 1974 [135]Himalia VI 93 9.56e+18 11,480,000 [136]C. Perrine 1904 [137]Lysithea X 18 7.77e+16 11,720,000 [138]S. Nicholson 1938 [139]Elara VII 38 7.77e+17 11,737,000 C. Perrine 1905 S/2000 J11 2 ? 12,654,000 Sheppard et al 2000 S/2000 J10 1.9 ? 20,375,000 Sheppard et al 2000 S/2000 J3 2.6 ? 20.733,000 Sheppard et al 2000 S/2000 J5 2.2 ? 21,019,000 Sheppard et al 2000 S/2000 J7 3.4 ? 21,162,000 Sheppard et al 2000 [140]Ananke XII 15 3.82e+16 21,200,000 S. Nicholson 1951 S/2000 J9 2.5 ? 21,734,000 Sheppard et al 2000 S/2000 J4 1.6 ? 21,948,000 Sheppard et al 2000 [141]Carme XI 20 9.56e+16 22,600,000 S. Nicholson 1938 S/2000 J6 1.9 ? 22,806,000 Sheppard et al 2000 [142]Pasiphae VIII 25 1.91e+17 23,500,000 P. Melotte 1908 S/2000 J8 2.7 ? 23,521,000 Sheppard et al 2000 [143]Sinope IX 18 7.77e+16 23,700,000 S. Nicholson 1914 S/2000 J2 2.6 ? 24,164,000 Sheppard et al 2000 S/1999 J1 1999 UX18 2.4 ? 24,296,,000 Spacewatch 1999 [144]HOME [145]Return to Mars [146]Voyage to Saturn _Copyright © 1997-2002 by [147]Calvin J. Hamilton. All rights reserved._ [148]Privacy Statement. 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http://www.solarviews.com/eng/terms.htm#accretion 122. http://www.solarviews.com/eng/metis.htm 123. http://www.solarviews.com/eng/adrastea.htm 124. http://www.solarviews.com/eng/amalthea.htm 125. http://www.solarviews.com/eng/people.htm#barnard 126. http://www.solarviews.com/eng/thebe.htm 127. http://www.solarviews.com/eng/io.htm 128. http://www.solarviews.com/eng/people.htm#marius 129. http://www.solarviews.com/eng/people.htm#galileo 130. http://www.solarviews.com/eng/europa.htm 131. http://www.solarviews.com/eng/ganymede.htm 132. http://www.solarviews.com/eng/callisto.htm 133. http://www.solarviews.com/eng/leda.htm 134. http://www.solarviews.com/eng/people.htm#kowal 135. http://www.solarviews.com/eng/himalia.htm 136. http://www.solarviews.com/eng/people.htm#perrine 137. http://www.solarviews.com/eng/lysithea.htm 138. http://www.solarviews.com/eng/people.htm#nicholson 139. http://www.solarviews.com/eng/elara.htm 140. http://www.solarviews.com/eng/ananke.htm 141. 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