Rings And Moons, A little picture Options

[dilo]

I believe that is the G ring, RedSky.

I think too. Herebelow an amazing animation of these super-exposed frames:
[img=http://img240.echo.cx/img240/5769/gring8pn.gif]
You can easily see Mimas and Janus (or Epimetheus) orbiting outside and inside it; in the last frames, also Prometheus is visible...

[DDAVIS]

A color study of the rings being refracted by the blue limb of Saturn from recent images:

http://www.donaldedavis.com/2005%20new/BENTRINGS.jpg

[dilo]

Great, it is a colorized image or a real multi-filter combination?

[DDAVIS]

[quote=dilo,Jun 16 2005, 02:01 AM]
Great, it is a colorized image or a real multi-filter combination?


It is an RGB image, although I had to artistically fill in parts of two of the channels as the images were offset somewhat.

Don

[dilo]

  It is an RGB image, although I had to artistically fill in parts of two of the channels as the images were offset somewhat.

Managed in order to obtain more realistic colors, hope you like!

[DDAVIS]

[quote=dilo,Jun 17 2005, 06:19 AM]
Managed in order to obtain more realistic colors, hope you like!

If you examine the original blue channel of my Saturn RGB try, located at:
http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=41651

you will find Saturn is brighter than the other color channel images of that view in the preceding frames. The rings provide a brownish gray reference so the colors I used might not be too far off, although the saturation and contrast need work before I would dare commit to calling it a try at a naked eye view. Numerous color images show a blue limb darkening on Saturn, and much of the planets northern hemisphere seems to appear fairly blue in between the ring shadows. This appears to be a narrow angle view showing the 'blue sky' of the upper atmosphere of Saturn along the limb.

Don

[djellison]

I found some interesting image sets recently - but had to make do with red green violet - the results are quite pleasing though.. This is a composite of two frames, for some reason they did it in three frames - but the middle one is totally redundant as far as I can tell.



http://www.unmannedspaceflight.com/doug_im.../sat_jun_05.jpg 64kb

Doug

[Bill Harris]

At first I suspected that the blue limb on Saturn was due to methane in the atmosphere, but now I'm thinking that it is due to aersol scattering in the clear upper atmosphere. I wonder if the blue area around the ring shadows is be due to cooling of the atmosphere and increased aerosols because the rings block whatever solar heating happens there?

--Bill

[dilo]

Last sequence of Cassini division show an intriguing variation in outer limit of A ring:
http://img76.echo.cx/img76/4820/cassinidivision5ly.gif

[volcanopele]

Rings are definitely NOT my speciality, but maybe the inner edge of the A ring is a eccentric, rather than circular?

[Guest_BruceMoomaw_*]

Voyager found at least 2 eccentric rings -- and I believe one of them WAS on the inner edge of the B Ring (which I think was what Dilo meant). I'll have to recheck this, though.

[Guest_BruceMoomaw_*]

Make that "the OUTER edge of the B Ring" -- that is, the inner edge of the Cassini Division.

[volcanopele]

See what I mean. I couldn't even tell if that was the inner edge of the A ring or the outer edge of the B ring... But still, eccentricity in the ring might be the cause

[dilo]

Yes, Jason, this should be the geometric explaination... (hey, we were both wrong about denomination! variation occour in the outer B ring edge! ).
But wath about mechanism originating eccentricity? The odd thing is that this variation do not appear in any other structure, even very close to this one...
Maybe explaination is the resonance 2:1 with Mimas, which exhibit some orbit eccentricity and can introduce this asymmetry. Or, more probably, is the combined resonance with Mimas + Tehys (4:1, more massive but circular orbit) which should introduce a mareal effect...
Who knows? (hey, should be funny to simulate this stuff!...)

[dilo]

Incredibly clear Saturn night side thanks to reverberated light from rings:
http://saturn.jpl.nasa.gov/multimedia/imag...2/W00008416.jpg
http://saturn.jpl.nasa.gov/multimedia/imag...2/W00008400.jpg