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Topic: Amalthea (moon)


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In the News (Tue 16 Jul 19)

  
  Jupiter's Inner Moons
Amalthea was the nymph who nursed the infant Jupiter with goat's milk.
Amalthea was the last moon to be discovered by direct visual observation (as opposed to photography).
Amalthea and Himalia are Jupiter's fifth and sixth largest moons; they are about the same size but only 1/15 the size of next larger one, Europa.
www.nineplanets.org /amalthea.html   (543 words)

  
  Amalthea (moon) - Wikipedia, the free encyclopedia
Amalthea was the last moon to be discovered by direct visual observation (as opposed to photographically), and was the first new moon of Jupiter to be discovered since Galileo Galilei discovered the Galilean moons in 1610.
Amalthea's irregular shape and large size led to conclusion that it is a fairly strong, rigid body; if it were composed of ices or other weak materials its own gravity would have pulled it into a more spherical shape.
The result [2] was surprising: Amalthea's overall density is close to the density of water ice, although the moon is almost certainly not a solid hunk of ice.
en.wikipedia.org /wiki/Amalthea_(moon)   (1125 words)

  
 Learn more about Amalthea (moon) in the online encyclopedia.   (Site not responding. Last check: 2007-11-02)
Amalthea was the last moon to be discovered by direct visual observation as opposed to photography, and the first since Galileo Galilei discovered the Galilean moons in 1610.
Amalthea is the reddest object in the solar system, even redder than the planet Mars.
Amalthea is irregularly shaped and heavily scarred by craters, some of which are extremely large relative to the size of the moon.
www.onlineencyclopedia.org /a/am/amalthea__moon_.html   (404 words)

  
 Encyclopedia: Amalthea (moon)
The Gaea Crater is a crater that appears on one of Jupiters smallest moons, Amalthea.
Mons Ida is a mountain on Amalthea, one of Jupiters smallest moons.
Amalthea, whose longest dimension is approximately 247 kilometers (154 miles) across, is tidally locked so that the same side of the satellite always points towards Jupiter, similar to how the near side of our own Moon always points toward Earth.
www.nationmaster.com /encyclopedia/Amalthea-(moon)   (3737 words)

  
 Jupiter's Moon Amalthea
Amalthea [am-al-THEE-uh] is one of Jupiter's smaller moons.
Because of Amalthea's close proximity to Jupiter, it is exposed to the intense Jovian radiation field.
Amalthea, whose longest dimension is approximately 247 kilometers (154 miles) across, is tidally locked so that the same side of the satellite always points towards Jupiter, similar to how the near side of our own Moon always points toward Earth.
www.solarviews.com /eng/amalthea.htm   (1323 words)

  
 Amalthea (moon) - Encyclopedia, History, Geography and Biography
Amalthea (am'-əl-thee'-ə, IPA: /ˌæməlˈθiə/, Greek Αμάλθεια) is the third moon of Jupiter (in order of distance from the planet), and the fifth in order of discovery, hence its Roman numeral designation of Jupiter V.It was discovered on September 9 1892 by Edward Emerson Barnard using the 36 inch (91 cm) refractor telescope at Lick Observatory.
The exact mass of Amalthea was measured and its density was found to be as low as 0.8 g/cm³—it must be either a relatively icy body or a very porous "rubble pile".
Jupiter would be an astonishing sight in Amalthea's night sky: 46 degrees across, it would appear roughly 92 times larger than than the full Moon.
www.arikah.net /encyclopedia/Amalthea_%28moon%29   (1155 words)

  
 Amalthea (moon)   (Site not responding. Last check: 2007-11-02)
Amalthea (pronounced "am al THEE a") is the third of Jupiter 's known moons.
Amalthea was the last moon to be discovered by direct visual observation as opposed tophotography, and the first new moon of Jupiter to be discovered since Galileo Galilei discovered the Galilean moons in 1610.
The combination of Amalthea's irregular shape and large size implies that Amalthea is a fairly strong, rigid body; if it werecomposed of ices or other weak materials its own gravity would have pulled it into a more spherical shape.
www.therfcc.org /amalthea-moon--31565.html   (353 words)

  
 Amalthea
Amalthea is also unusual in that it appears to give out more heat than it receives from the Sun.
Observations of Amalthea by the Galileo spacecraft, in late 2002, showed that the moon has a very low density, indicating that it may be a loosely packed pile of rubble.
Amalthea now seems more likely to be mostly rock with perhaps a little ice, rather than a denser mix of rock and iron.
www.daviddarling.info /encyclopedia/A/Amalthea.html   (575 words)

  
 BBC NEWS | Science/Nature | Jupiter moon 'full of holes'
The inner moons of Jupiter have undergone intense bombardment and break-up
Amalthea's overall density is close to the density of water ice, Dr Anderson says.
Amalthea's irregular shape and low density suggest the moon has broken into many pieces that now cling together due to their mutual gravity.
news.bbc.co.uk /1/hi/sci/tech/2561569.stm   (487 words)

  
 Galileo probe finds one of Jupiter's moons is full of holes   (Site not responding. Last check: 2007-11-02)
The Amalthea moon, which is shaped like a potato, "is apparently a loosely packed pile of rubble," said astronomer John Anderson, of NASA's Jet Propulsion Laboratory, which is based in Pasadena, California.
Amalthea's highly irregular shape suggests it is composed of several pieces which were drawn to each other by their respective gravities, leaving large holes where the pieces didn't fit, the NASA scientists said.
Amalthea was discovered in 1892 and was the first moon of Jupiter to be discovered since Galileo's four.
www.spacedaily.com /2002/021209223222.skekzfz9.html   (367 words)

  
 [No title]   (Site not responding. Last check: 2007-11-02)
Amalthea's overall density is close to the density of water ice, Anderson reports today at the fall meeting of the American Geophysical Union in San Francisco.
Amalthea's irregular shape and low density suggests the moon has been broken into many pieces that cling together from the pull of each other's gravity, mixed with empty spaces, where the pieces don't fit tightly together.
Amalthea may have formed originally as one piece, but then was busted to bits by collisions." Amalthea does not have quite enough mass to pull itself together into a consolidated, spherical body like Earth's moon or Jupiter's four largest moons.
quest.arc.nasa.gov /news/space/2002/12-09.txt   (625 words)

  
 Amalthea - Wikipedia, the free encyclopedia
Amalthea (mythology), in Greek mythology the foster-mother of Zeus.
Amalthea was the name of a ship harboring strikebreakers in Malmö, Sweden in 1908.
Lady Amalthea is the name of a character in the fantasy novel and animated movie The Last Unicorn.
en.wikipedia.org /wiki/Amalthea   (114 words)

  
 Jovian moon Amalthea just a bunch of rocks / Orbiting Galileo spacecraft measures the mass of potato-shaped satellite, ...
The potato-shaped Jovian moon Amalthea may be the wreckage of a once-solid world that was broken to bits by collisions with extraterrestrial debris, judging by observations from the Galileo space probe, said NASA astronomer John D. Anderson.
The moon's potato shape is explained by its low mass, which means it doesn't have enough gravity to collapse into a spherical shape like Earth, other planets and most of their natural satellites.
Amalthea was previously suspected to be a denser mix of rock and iron.
www.sfgate.com /cgi-bin/article.cgi?file=/c/a/2002/12/10/MN177318.DTL   (529 words)

  
 Solar System Exploration: Planets: Jupiter: Moons: Amalthea
Orbiting inside the orbit of Io, which is the innermost of the four largest moons of Jupiter (called the Galilean moons), are four smaller moons.
Amalthea is the reddest object in the solar system and it appears to give out more heat than it receives from the Sun.
Amalthea and Thebe rotate on their axes once for each orbit around Jupiter (which take around one-half an Earth day for Amalthea and two-thirds an Earth day for Thebe), always keeping the same side facing the planet.
solarsystem.nasa.gov /planets/profile.cfm?Object=Jup_Amalthea   (394 words)

  
 Universe Today - Amalthea is Just a Pile of Icy Rubble
Scientists expected moons closer to the planet to be rocky and not icy.
Another is that the moon formed farther from Jupiter, either beyond the orbit of Jupiter's moon Europa or in the solar nebula at or beyond Jupiter's position.
Amalthea is a small red-tinted moon that measures about 168 miles in length and half that in width.
www.universetoday.com /am/publish/amalthea_pile_rubble.html?162005   (659 words)

  
 Amalthea
During the Interplanetary Age, the Jovian League used this moon as an easy source of water, the individual boulders later being mined for silicon, aluminium, oxygen and titanium for construction purposes in situ, but were found to be relatively iron poor.
Due to its position in the Jovian magnetic field the moon was a net producer of electromagnetic energy, and became one of the richest self contained habitats in Jovian Space.
The symbol of the Amalthean Bernal Sphere was a goat, derived from the role of the mythical Amalthea as a milkmaid.
www.orionsarm.com /worlds/Amalthea.html   (251 words)

  
 JUPITER'S Moons - EnchantedLearning.com
The moons of Jupiter are (in order by their distance from Jupiter): Metis, Adrastea, Amalthea, Thebe, Io, Europa, Ganymede (the biggest), Callisto (the second biggest), Leda (the smallest), Himalia, Lysithea, Elara, Ananke, Carme, Pasiphae, Sinope, and many newly-discovered moons that haven't been named yet.
Amalthea is 145 x 91 x 83 miles (232 x146 x134 km) in diameter and orbits 112,700 miles (181,300 km) from Jupiter, within the faint Gossamer ring.
Callisto is a large, icy, dark-colored, low-density outer moon of Jupiter that is scarred with impact craters and ejecta.
www.enchantedlearning.com /subjects/astronomy/planets/jupiter/moons.shtml   (1408 words)

  
 Astronomy - Jovian moon Amalthea is a rubble pile - Robert Burnham
The team, led by John Anderson of the Jet Propulsion Laboratory in Pasadena, California, derived Amalthea's volume using images taken by Voyagers 1 and 2 in 1979 and by the Galileo spacecraft in 1996 and 1997 to model its shape.
While the exact proportions are unknown with Amalthea, say the scientists, the moon's porosity probably lies in the 30 to 55 percent range.
Amalthea's elongated shape — 157 by 91 by 80 miles (250 by 146 by 128 km) — shows that, whatever the actual mix of rock and ice, the pressures at its center are not great enough to overcome the strength of the material, otherwise the moon would be rounder.
www.astronomy.com /asy/default.aspx?c=a&id=3188   (493 words)

  
 Steven Caron; Amalthea from Coe   (Site not responding. Last check: 2007-11-02)
The moon appeared very, very, faint, and very, close to Jupiter, but it was definitely there using 380X.
Amalthea is also the reddest object in the solar system, no color was evident though.
In contrast, Amalthea would have been on the opposite side of the planet at 9:15 pm, according to the JPL ephemeris (western or preceeding side of Jupiter, position angle 257).
observers.org /reports/2000.11.04.8.html   (502 words)

  
 Spaceflight Now | Breaking News | Featherweight Jupiter moon is likely a jumble of pieces
Galileo's seven-year run continued with the discovery that Jupiter's potato-shaped inner moon, named Amalthea, appears to have a very low density, indicating it is full of holes.
The empty gaps between solid chunks likely take up more of the moon's total volume than the solid pieces, and even the chunks are probably material that is not dense enough to fit some theories about the origin of Jupiter's moons.
Amalthea does not have quite enough mass to pull itself together into a consolidated, spherical body like Earth's moon or Jupiter's four largest moons.
spaceflightnow.com /news/n0212/09amalthea   (963 words)

  
 Jupiter's icy moon intrigues scientists / Porous Amalthea most likely formed in colder region
Measurements of Amalthea's orbital speed and its size indicate that its density must be even less than water, a team of American and Australian scientists are reporting today in the journal Science.
The little moon was found in 1892 by UC Berkeley astronomy Professor Edward E. Barnard, and was the first of Jupiter's moons to be discovered since the astronomer Galileo's day.
It is one of Jupiter's smaller moons, only 170 miles long and less than 90 miles thick, and its red-tinged surface -- probably colored by sulfur erupted from one of the volcanoes on the nearby Jovian moon Io -- is pocked with ancient craters.
sfgate.com /cgi-bin/article.cgi?file=/c/a/2005/05/27/MNGNECVGQV1.DTL   (502 words)

  
 spacetoday.net: Jupiter moon Amalthea "full of holes"
Amalthea, a small inner moon of Jupiter, has an unusually low density which means that it is likely an agglomeration of smaller pieces, scientists said Monday.
Scientists believe that since the moon is not likely to be made mostly of ice, it is instead made of chunks of denser rock with large gaps between them; the empty space may make up more than half of the moon's volume.
Amalthea may have started out as a single solid body, scientists speculate, that was later broken up through collisions only to reform in its current state.
www.spacetoday.net /Summary/1352   (263 words)

  
 :: Discovery Channel CA ::
The story of the Galilean moons is well known, but even astronomers have a hard time remembering who discovered Jupiter's fifth moon.
Instead, tradition prevailed and the moon was given the mythological name "Amalthea", after the nymph who nursed the infant Jupiter.
But by measuring how Amalthea's gravity effects the motion of the spacecraft, scientists should be able to work out whether Jupiter's fifth moon is made of rock - like an asteroid, ice - like a comet, or something in between.
www.exn.ca /Stories/2002/11/01/52.asp?t=dp   (602 words)

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