... FLIES BY SATURN'S TORTURED MOON MIMASOn its recent close flyby of Mimas, the Cassini spacecraft found ... seen in the new images.The new Mimas images are available at http://ciclops.org, ... available ...
... and images of Saturn's icy moon Mimas obtained by NASA's Cassini spacecraft ... the spotlight, but it turns out Mimas is more bizarre than we thought ... infrared spectrometer, which mapped Mimas' ...
... affected by the gravity of the moon Mimas. This process is commonly believed ... Saturn's rings due to the moon Mimas. Resonances in Saturn's rings ... particles orbits. In the case of the Mimas ...
... gravity of the nearby larger moon Mimas disturbs their orbits. Gravitational ... in Saturn's magnificent rings. Mimas provides a regular gravitational ... orbits due to their resonance with Mimas, ...
... moons orbit between much larger Mimas and Enceladus.Moons surrounding ... Methone, is in such a resonance with Mimas and appears to have undergone ... 4 are dynamically locked with Mimas gives us a ...
Cassini's closest flyby of Mimas on August 2nd revealed it to be one of the most heavily cratered Saturnian moons, with variations in color across its surface but little if any evidence for internal activity.
It is so interesting to see how different the individual moons are within a particular system.
With Saturn's system, the difference between Titan & Mimas is most striking. Phoebe almost certainly is an interloper from the KBO, Hyperion is just odd, Enceladus, highly active, Dione also probably moderately active, Tethys, Rhea, & Mimas as dead as door nails.
Iapetus is extremely fascinating for other reasons.
I suspect the Uranian moons had more radiactive elements & it is interesting to see, how much denser Titania & Oberon are to Saturn's similarly sized moons Rhea & Iapetus.
Clearly the Saturn & Uranus systems have evolved very differently.
I like your comparison of the differences between Io & Callisto in the Jovian system. True, Jupiter's immensely gravity & tidal influences have much to do with this.
Even so, Io is poor in volatiles, but heavily differentiated & contains a large amout of heavy materials (Io has the highest density & surface gravity of the solar system's moons). Callisto appears to be a mixture of rock & ice, with a slight concentration of rock towards the centre, but not enough to form a core.
Probably much like Rhea, which appears to be much like a smaller Callisto.
I suspect in the case of Rhea, it is lighter less space weathered ice being deposited over older more space weathered ice.
Rhea appears to have had no internal geological activity, the entire surface appears to have been effected by impact events.
I use the word appears, as in the images I have & have seen, can see no evidence for anything else other than impacts.
Many of Saturn's moons appear to have had varying degrees of geological activity to varying degrees.
Enceladus & Titan: extensive.
Dione: moderate overall, extensive in a few locations.
Iapetus: Some, the giant equatorial ridge of the Voyager Mountains.
Tethys: Little, smoother equatorial regions, Ithaca Chasma, little else.
Rhea & Mimas: None as far as I can tell, only impact cratering.
Rhea appears to be a bit of an odd ball in this respect. Rhea is a large object that appears to have had little other than impacts happen to it.
Rhea is similar in size to the Uranus moons Titania & Oberon, as well as Iapetus.
In descending diameter size order below:
Titania: 1,578 KM. Largest moon of Uranus. Density: 1.70 Grammes cm/3
Comments: Giant canyons, smoother subdued craters in places, possibly previous cryovolcanism, possibly very tenuous atmosphere.
Rhea: 1,528 KM. Second largest moon of Saturn. Density: 1.33 Grammes cm/3.
Comments: Little has happened apart from impact cratering.
Oberon: 1,522 KM. Second largest moon of Uranus. Density: 1.64 Grammes cm/3.
Comments. Like Rhea has experienced extensive cratering. Unlike Rhea, has tall mountains & has had experienced cryovolcanism & like Titania possible limited tectonic activity. Possibly a very tenuous atmosphere. Note Oberon's average diameter is only 6 KM less than Rhea's, but is somewhat more massive due to higher density.
Iapetus: 1,436 KM. Third largest moon of Saturn. Density: 1.21 Grammes cm/3.
Comments. Odd ball moon. Dark leading, bright trailling hemispheres. Huge equatorial mountain range, some peaks almost as tall as those on Mars & Io.
I suspect Rhea's lesser density (greater ice to rock ratio) may explain lack of geological activity.
Once again, thank you very much Carolyn.
3488 is strange, I agree completely 100% with you. No secret I'm happy to explain. Due to my troubled youth with my condition (High Functioning Autistic), it was thought that I could never live outside of sheltered housing.
Well I proved them all wrong. Got my own flat & 3488 was my first ever PIN for my bank account, so that number has real significance.
Not only that it is easy to remember & as there is no other 3488 on any message board on the web, I am easy to find.
Back to Sector 6.
I like the idea of placing Cassini inside of the D Ring. A variant if possible, could Cassini be placed into a very close polar orbit around Saturn?
Twice each orbit the rings would be approached very closely, enabling high resolution imaging, both back & front, whilst global weather monitoring would be doable.
A bit like the JUNO mission to Jupiter & would be able to compare JUNO results directly with Saturn.
I still aim for the Northern Summer Solstice though with the mission carrying on as is. Hopefully we will still get many more Titan, Enceladus & Dione encounters in. Shame we cannot revisit Iapetus & Phoebe due to DeltaV issues (it would be scientifically very valuable to encounter ex KBO Phoebe again, but with the opposite side facing Cassini at closest approach).
Are we likely to get a very close encounter with Mimas & / or Janus, Prometheus, the Dione & Tethys co-orbitals?
It is great talking with you.
Nice image, as earlier ones that featured other moonlets near Saturn's limb and the warping caused on the rings by Saturn's atmosphere. It would be interesting to see something alike, but with a largue moon -Mimas, Enceladus...- near of the planet's limb; surely, the apparent warping of the moon would be spectacular.
GREETINGS THIS IS ANAKA HURAKAN, I HAVE HAD A PROBLEM IN MY RECENT ATTEMPTS TO LOG IN. HOPEFULLY THE PROBLEM HAS BEEN RESOLOVED,I SHALL NOT RELEASE RESTRICTED IMFORMATION.I AM ON MIMAS LETS PLAY GOLF!FOUR
What do you think about my 3-D anaglyphics rotating maps of a eleven Saturn's moons?
Moonsister... The impact that created Herschel Crater, shown here, came very close to smashing Mimas to bits. And that is one notion for how rings came to be: a pre-existing moon that was catastrophically disrupted into a ring of debris that, through collisions, eventually settled down into a thin, quiet disk of ring particles.