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Low-light-level Imaging: Rings, Nightsides, Etc., Low light observations: Saturn System
edstrick
post Nov 4 2005, 11:59 AM
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Ooooh!.

I was brousing the last 500 "raw" images and spotted an overexposed F-ring shot with a trace of G-ring, so I contrast-stretched it to see more.. there was something in the foreground...

Then I decided to contrast a badly auto-contrast stretched Saturn nightside image.
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edstrick
post Nov 5 2005, 10:51 AM
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Phil: Thanks. I didn't go back and check.

Here's 3 more from the F-ring "movie"
#42291 is also one of the inner "potatos" in front of the rings. In both of these shots, this and #42321, the part of the moon's nightside that is not illuminated by a crescent Saturn is darker then the background. There clearly is a "glow" behind these moons that is not scattered light from the F-Ring in the camera, but is an extended halo of the rings that I'm not sure has been this clearly seen before. (There was one crescent ?Thethys? series some months back that also had a bright background glow behind the moon.) Note you can also see the G-Ring.

#42273, 42269, and 42312 all have crescent moons behind the rings, with most of the nightsides illuminated by Saturn shine.

Finally, in a recent series of "E-Ring" wide angle images, W00012012 is maybe the best example, what I expect is Enceladus appears to have a bright fringe on the nightside silhoueted against the E-ring glow that I'm inclined to think is not jpg artifact. All the images in this sequence that are well enough exposed to show the brightness difference between the nightside and the E-ring without wiping out the nightside show it. It looks real, but the horrible compression artifacts in these 512 x 512 wide angle images leave me mentally flipping back and forth.
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