Saturn's Rings To Shine As Never Before |
Saturn's Rings To Shine As Never Before |
Guest_Sunspot_* |
Sep 16 2006, 10:19 AM
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#1
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Guests |
http://saturn.jpl.nasa.gov/news/features/feature20060915.cfm
Ring scientists have been waiting for this. Finally, after more than two years orbiting Saturn, the Cassini spacecraft reaches one of the ultimate vantage points. The rings should shine with majesty worthy of the "Jewel of the Solar System." |
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Aug 14 2007, 05:33 PM
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#2
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Senior Member Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
I've been messing around with the Sep 15, 2006 backlit sequence from the PDS. While there are numerous wide-angle frames that are taken at half resolution, there's only one RGB set taken at full 1024x1024 resolution and that's of Saturn itself:
. Vertical charge bleed in the red channel was so big I had to cheat a bit to remove it and make it less ugly. Also, since the CICLOPS backlit mosaic image advisory states the color was generated from UV, clear and IR frames (there are no complete mosaic coverage RGB sets available, only the left ring ansa region and it's pretty overexposed), here's what actual RGB color gives, these were taken with 2x binning, it's a quick 4 footprint mosaic (incomplete, there's a bit of additional E ring coverage available I omitted): The bright dot is, of course, Earth. Finally, a colorized composite of 2 clear filter NAC shots of Enceladus, the upper one is a 1.2 second exposure, the lower one is a 18 second exposure. Views on the right are enhanced to bring out subtle plume structure. The overall hue is that of the E ring seen at this phase angle (178 degrees). Note Enceladus' shadow on the E ring in the lower composite. EDIT: And here's a merge of the two exposures in an attempt to maximize S/N ratio, again with (too?) heavy enhancing done: The two most prominent jets trace back to the south pole nicely, but there's a peculiar detached, slightly curved 'puff' or two to the left of the long jet that doesn't seem to trace back. It appears torn apart. Even more curious is another streak that appears to emanate above the northern latitudes. I don't think either is an artifact of the processing (similar to the brightening around shadow edge and the limb). Is Enceladus' gravity strong enough to perturb the jets that hard? -------------------- |
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