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Topic: Amalthea

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In the News (Sun 21 Jul 19)

  Amalthea (mythology) - Wikipedia, the free encyclopedia
She is sometimes represented as the goat which suckled the infant-god in a cave in Crete, sometimes as a nymph of uncertain parentage (daughter of Oceanus, Haemonius, Olen, Melisseus), who brought him up on the milk of a goat.
Amalthea gave it to Achelous (her reputed brother), who exchanged it for his own horn which had been broken off in his contest with Heracles for the possession of Deianeira.
Speaking generally, it was regarded as the symbol of inexhaustible riches and plenty, and became the attribute of various divinities (Hades, Gaia, Demeter, Cybele, Hermes), and of rivers (the Nile) as fertilizers of the land.
en.wikipedia.org /wiki/Amalthea_(mythology)   (279 words)

 Amalthea (moon) - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-07)
Amalthea (am'-ul-thee'-a, 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.
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.
www.secaucus.us /project/wikipedia/index.php/Amalthea_(moon)   (892 words)

 Amalthea - Wikipedia, the free encyclopedia
Amalthea, in Greek mythology, is the foster-mother of Zeus.
Amalthea is the third of Jupiter's known moons.
Amalthea was the name of a ship harboring strikebreakers in Malmรถ, Sweden 1908.
en.wikipedia.org /wiki/Amalthea   (122 words)

 * Amalthea - (Astronomy): Definition   (Site not responding. Last check: 2007-11-07)
Amalthea was the nymph who nursed the infant Jupiter with goat's milk...
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...
Amalthea - This small moon, 118 miles in diameter, was a target of the Galileo spacecraft on it's final pass around Jupiter...
www.bestknows.com /astronomy/amalthea.html   (581 words)

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   (571 words)

 Amalthea Fact Sheet   (Site not responding. Last check: 2007-11-07)
Amalthea was discovered by the exceptionally keen eyesight of American astronomer Edward Barnard in 1892 using the 36 inch (91 cm) refractor telescope at Lick Observatory.
Amalthea is a dark object and reddish in color.
Being this close to Jupiter, Amalthea is exposed to the intense radiation field of Jupiter, and is exposed to high dosages of energetic ions, protons and electons in the Jovian magnetosphere.
www.bonus.com /contour/Project_galileo/http@@/www2.jpl.nasa.gov/galileo/amalthea   (352 words)

 Jupiter's Inner Moons
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.
It now appears that Amalthea's density is only about the same as water and since it is unlikely to be composed of ice it is most likely a loose "rubble pile" with a lot of empty spaces.
www.seds.org /nineplanets/nineplanets/amalthea.html   (543 words)

Amalthea is a satellite of the planet Jupiter.
Compared with the satellites of other planets of the solar system, Amalthea is a large Moon with a diameter of 262(X 146 X 134) km and a mass of 7.17E+18 kg kg.
Amalthea is an average distance of 181300 km from Jupiter and completes its rotation of Jupiter in 0.50 days.
www.absoluteastronomy.com /moons/amalthea.htm   (68 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 discovery is based on recent measurements of Amalthea's slight gravitational effect on the orbit of the Galileo probe.
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&type=printable   (494 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)

 NASA's Solar System Exploration: Planets: Jupiter: Moons: Amalthea
However, because they are so small (the largest, Amalthea having a diameter that is just 1/19th that of Io), they are relatively immune to the effects of tidal forces.
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.
sse.jpl.nasa.gov /planets/profile.cfm?Object=Jup_Amalthea   (402 words)

 NASA's Solar System Exploration: News & Events: 12.09.02: Jupiter's Amalthea Surprisingly Jumbled
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.
Galileo's flyby of Amalthea brought the spacecraft closest to Jupiter since it began orbiting the giant planet on Dec. 7, 1995.
solarsystem.nasa.gov /news/display.cfm?News_ID=3919   (688 words)

 Catalog Page for PIA01626   (Site not responding. Last check: 2007-11-07)
Amalthea is actually much darker than Io, but is displayed at a similar brightness for ease of viewing.
The shape of Amalthea is controlled largely by impact cratering and fragmentation.
The Amalthea composite combines data taken with the clear filter of the SSI system during orbit six, with lower resolution color images taken with the green, violet, and 1 micrometer filters during orbit 4.
photojournal.jpl.nasa.gov /cgi-bin/PIAGenCatalogPage.pl?PIA01626   (287 words)

 Catalog Page for PIA02532   (Site not responding. Last check: 2007-11-07)
Note that the north pole of Amalthea is missing in the right-hand image (it was cut off by the edge of the camera frame).
The bright streak, Ida, is on the side of the moon that faces permanently away from Jupiter, and the crater near the right-hand edge of the disk is in the center of Amalthea's leading side (the side of the moon that "leads" as Amalthea moves in its orbit around Jupiter).
The images are, from left to right: Amalthea taken on August 12, 1999 at a range of 446,000 kilometers (about 277,000 miles) and on November 26, 1999 at a range of 374,000 kilometers (about 232,000 miles).
photojournal.jpl.nasa.gov /cgi-bin/PIAGenCatalogPage.pl?PIA02532   (330 words)

 Amalthea Flyby: The Heat is On :: Astrobiology Magazine :: Search for Life in the Universe
A relatively close passage by Amalthea, one of Jupiter's innermost known satellites, is of scientific interest because so little is known accurately about the radiationally-intense area nearest Jupiter.
This density estimate is important because Amalthea may be a fragment of an object that formed closer to Jupiter than the Galilean satellites, where temperatures in the circumjovian nebula would have been higher.
Given that Amalthea's volume is currently known to an accuracy of about 10%, a mass accurate to even 20% may allow conclusions to be drawn about conditions in the jovian nebula and the satellite-formation processes, in general.
www.astrobio.net /news/modules.php?op=modload&name=News&file=article&sid=270&mode=thread&order=0&thold=0   (1149 words)

 Amalthea   (Site not responding. Last check: 2007-11-07)
Amalthea from the 26th orbit of the Galileo spacecraft.
It did not attempt to image Amalthea due to budgetary reasons and due to the likelyhood that a turn of the spacecraft would cause it to go into safe mode, costing the entire flyby.
It is a shame no better imaging was done, but it was perhaps a worthwhile gamble; the fascinting results of the flyby could have been lost had the spacecraft gone into safe mode before the flyby (which did happen fifteen minutes later, underscoring the risk).
pages.preferred.com /~tedstryk/amalthea.html   (418 words)

 BBC NEWS | Science/Nature | Jupiter moon 'full of holes'
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.
Scientists are surprised Amalthea's density estimate is so low that even the solid parts of Amalthea are apparently less dense than Io, a larger moon that orbits about twice as far from Jupiter.
news.bbc.co.uk /1/hi/sci/tech/2561569.stm   (487 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   (618 words)

 APOD: November 3, 1995 - Jupiter's Moon Amalthea   (Site not responding. Last check: 2007-11-07)
Amalthea is inside of these moons, and with its long axis always pointing toward Jupiter.
Amalthea is not massive enough for its internal gravity to make it spherical.
Amalthea was discovered in 1892 by Edward Barnard.
www.star.ucl.ac.uk /~apod/apod/ap951103.html   (99 words)

 Amalthea Mystery: How Did a Snowball Get So Close to Jupiter?   (Site not responding. Last check: 2007-11-07)
Not only is Amalthea not rocky, it is less dense even than water; according to the team's calculations, it is about 82% (plus or minus 9%) the density of the slightly dirty water ice typical of icy bodies in the Solar System.
The measurement of Amalthea's density was derived from painstaking analysis of the radio signals sent by Galileo to the Earth as the spacecraft flew by Amalthea on November 5, 2002.
And Amalthea's orbit is so close to Jupiter that the heat of the giant planet's formation would have vaporized any water so close to it, preventing it from condensing into a moon.
www.planetary.org /news/2005/amalthea_density_0610.html   (766 words)

 JPL.NASA.GOV: News Releases
Amalthea is one of four small moons closer to Jupiter than the four large moons -- Io, Europa, Ganymede and Callisto -- that Galileo has inspected during more than 30 encounters since late 1995.
By measuring the strength of Amalthea's gravity tugging at the spacecraft, researchers intend to determine the moon's mass, said JPL's Dr. Torrence Johnson, Galileo project scientist.
Likewise for Jupiter's four large moons: Io, the innermost, is mainly dense rock and iron, while Ganymede and Callisto, the two outermost, are mixtures of rock and ice, and Europa completes a gradient in between.
www.jpl.nasa.gov /news/news.cfm?release=2002-199   (893 words)

 NASA's Solar System Exploration: Galileo Legacy Site: News: 11.06.02: Galileo's Amalthea Flyby a 'Partial Success'
Amalthea orbits about halfway between Jupiter and Io, the innermost of the planet's four large moons.
Amalthea is an elongated body, about 270 kilometers (168 miles) long.
That's so there will be no risk of it drifting to an unwanted impact with the moon Europa, where Galileo discovered evidence of a subsurface ocean that is of interest as a possible habitat for extraterrestrial life.
galileo.jpl.nasa.gov /news/display.cfm?News_ID=3633   (495 words)

 News - Amalthea
Amalthea is the bright object in the lower left corner and Jupiter occupies the upper half of the image.
This suggests that Amalthea may have been one of the many small "micro-satellites" orbiting Jupiter that was sucked into an inner orbit when the Galilean moons formed.
However, the spectrum of Amalthea has similarities with asteroids orbiting the Sun, suggesting that is was a "micro-planet" that was pulled into Jupiter's orbit when Jupiter itself was forming.
www.astronomynow.com /news/041224_amalthea.shtml   (942 words)

 Jupiter's Moons Thebe, Amalthea, and Metis [Free Republic]
These pictures of Thebe, Amalthea, and Metis are shown to scale, and reveal details as small as three kilometers across.
Amalthea, by contrast, has a total length of about 200 kilometers.
Astronomers are uncertain of the origin of the unusual white gash at the bottom of Amalthea.
www.freerepublic.com /forum/a391657f020b9.htm   (345 words)

Of the 17 moons it is the 3rd closest to Jupiter, with a standoff distance of 181,300 km.
Amalthea is about the size of a county or small state, and is just 135 x 75 km (84 x 47 miles) in size.
As a small moon, the composition and surface features of Amalthea are unknown.
www.windows.ucar.edu /tour/link=/jupiter/moons/amalthea.html   (130 words)

Amalthea (Jupiter V) is the third of Jupiter's known satellites:
The reddish color of Amalthea's surface is apparently due to sulfur originating from Io.
Its size and irregular shape imply that Amalthea is a fairly strong, rigid body.
www.if.ufrj.br /teaching/astron/amalthea.html   (340 words)

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