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#1
August 15th 04, 04:43 AM
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leading edge of moons?
"Astronomers have known about this dichotomy ever since Italian-French
astronomer Jean Dominique Cassini discovered Iapetus in 1672. He correctly surmised that the moon's trailing hemisphere as it moves around Saturn is composed of highly reflective material but that the leading hemisphere is apparently without the glitter. That's in contrast to the other 30 known moons of Saturn, as well as the moons of Jupiter, all of which tend to be brighter on their leading edges." - from the article, "Cassini eyes Iapetus": Science News, July 31, 2004; Vol. 156, No. 5, p. 77 Do all of the moons of Saturn and Jupiter present the same face toward their planets? I had assumed (perhaps erroneously) that Earth's moon was an oddity. Is this the standard behavior for moons in the Solar system? heron -- unDO email address ___ Nature, heron stone to be commanded, must be obeyed. http://home.comcast.net/~heronstone/ 
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#2
August 15th 04, 04:45 AM
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"heron stone" wrote in message ...
"Astronomers have known about this dichotomy ever since Italian-French astronomer Jean Dominique Cassini discovered Iapetus in 1672. He correctly surmised that the moon's trailing hemisphere as it moves around Saturn is composed of highly reflective material but that the leading hemisphere is apparently without the glitter. That's in contrast to the other 30 known moons of Saturn, as well as the moons of Jupiter, all of which tend to be brighter on their leading edges." - from the article, "Cassini eyes Iapetus": Science News, July 31, 2004; Vol. 156, No. 5, p. 77 Do all of the moons of Saturn and Jupiter present the same face toward their planets? I had assumed (perhaps erroneously) that Earth's moon was an oddity. Is this the standard behavior for moons in the Solar system? No and Yes. Rick
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#3
August 15th 04, 05:12 AM
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Rick wrote: "heron stone" wrote in message ... "Astronomers have known about this dichotomy ever since Italian-French astronomer Jean Dominique Cassini discovered Iapetus in 1672. He correctly surmised that the moon's trailing hemisphere as it moves around Saturn is composed of highly reflective material but that the leading hemisphere is apparently without the glitter. That's in contrast to the other 30 known moons of Saturn, as well as the moons of Jupiter, all of which tend to be brighter on their leading edges." - from the article, "Cassini eyes Iapetus": Science News, July 31, 2004; Vol. 156, No. 5, p. 77 Do all of the moons of Saturn and Jupiter present the same face toward their planets? I had assumed (perhaps erroneously) that Earth's moon was an oddity. Is this the standard behavior for moons in the Solar system? No and Yes. Rick Some moons are in fact planet really, but just captured by much larger planets themselves. Opinions anyone?
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#4
August 15th 04, 05:51 AM
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"Rick" wrote in :
"heron stone" wrote in message ... "Astronomers have known about this dichotomy ever since Italian-French astronomer Jean Dominique Cassini discovered Iapetus in 1672. He correctly surmised that the moon's trailing hemisphere as it moves around Saturn is composed of highly reflective material but that the leading hemisphere is apparently without the glitter. That's in contrast to the other 30 known moons of Saturn, as well as the moons of Jupiter, all of which tend to be brighter on their leading edges." - from the article, "Cassini eyes Iapetus": Science News, July 31, 2004; Vol. 156, No. 5, p. 77 Do all of the moons of Saturn and Jupiter present the same face toward their planets? I had assumed (perhaps erroneously) that Earth's moon was an oddity. Is this the standard behavior for moons in the Solar system? No and Yes. Really? Which satellites (moons) in our solar system are not tidally locked to their planets?
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#5
August 15th 04, 08:14 AM
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"Paul Lawler" wrote in message . 125.202... Really? Which satellites (moons) in our solar system are not tidally locked to their planets? Hyperion + Saturn
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#6
August 15th 04, 10:28 AM
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"A.Gent" wrote in message u...
"Paul Lawler" wrote in message . 125.202... Really? Which satellites (moons) in our solar system are not tidally locked to their planets? Hyperion + Saturn Correct. Hyperion is locked in a 3:4 orbital resonance with Titan. Rick
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#7
August 15th 04, 10:44 AM
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In message , Rick writes
"A.Gent" wrote in message . au... "Paul Lawler" wrote in message . 125.202... Really? Which satellites (moons) in our solar system are not tidally locked to their planets? Hyperion + Saturn Correct. Hyperion is locked in a 3:4 orbital resonance with Titan. More to the point, it's got a 13 day rotation period and a 79 day orbit. Actually, that's a Voyager result and Hyperion is known to have a chaotic rotation. Is the period the same now? Phoebe isn't locked either, it's got a rotation period of about 9 hours. -- What have they got to hide? Release the full Beagle 2 report. Remove spam and invalid from address to reply.
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#8
August 15th 04, 10:57 AM
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"Rick" wrote in :
"A.Gent" wrote in message u... "Paul Lawler" wrote in message . 125.202... Really? Which satellites (moons) in our solar system are not tidally locked to their planets? Hyperion + Saturn Correct. Hyperion is locked in a 3:4 orbital resonance with Titan. Wow... see what happens when you keep your eyes open... you learn things! Thanks, guys!
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#9
August 15th 04, 12:05 PM
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In message . 201, Paul
Lawler writes "Rick" wrote in : "A.Gent" wrote in message u... "Paul Lawler" wrote in message . 125.202... Really? Which satellites (moons) in our solar system are not tidally locked to their planets? Hyperion + Saturn Correct. Hyperion is locked in a 3:4 orbital resonance with Titan. Wow... see what happens when you keep your eyes open... you learn things! The day I stop learning things I'll be dead (which recalls the uncomfortable CM Kornbluth line). Does anyone even know if the outer moons of Jupiter and Uranus are tidally locked? The Jovian moons are in retrograde orbits and are supposed to be captured asteroids like Phobe, which isn't locked, for instance. Neptune's moon Nereid isn't locked, either.
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#10
August 15th 04, 12:35 PM
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Jonathan Silverlight wrote
Paul Lawler writes "Rick" wrote in : "A.Gent" wrote in message "Paul Lawler" wrote in message Really? Which satellites (moons) in our solar system are not tidally locked to their planets? Hyperion + Saturn Correct. Hyperion is locked in a 3:4 orbital resonance with Titan. Wow... see what happens when you keep your eyes open... you learn things! The day I stop learning things I'll be dead (which recalls the uncomfortable CM Kornbluth line). Does anyone even know if the outer moons of Jupiter and Uranus are tidally locked? The Jovian moons are in retrograde orbits and are supposed to be captured asteroids like Phobe, which isn't locked, for instance. Neptune's moon Nereid isn't locked, either. Okay, now I'm confused. After much Googling, I was under the impression that Hyperion was the only satellite (moon) in our solar system that is not tidally locked.
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