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Rev 121 - Nov 11-30, 2009 - Rhea
Juramike
post Nov 22 2009, 04:12 AM
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The rev 121 Enceladus flyby is discussed in a different thread - moderator

November 21 images RGB[IR1,GRN,UV3] + CL1CL2 as luminance layer (only 60% opacity).
Cassini raw images N0156887-90.jpg distance about 25,000 km.
Colors adjusted.

Attached Image


-Mike

Full res TIFF here (1 Mb): http://www.flickr.com/photos/31678681@N07/4123921310/


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Juramike
post Nov 22 2009, 04:51 AM
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Rhea lineaments (RGB[RED,GRN,BL1] + CL1 CL2 luminosity layer ):

Attached Image


Full res TIFF on Flickr (700 kb): http://www.flickr.com/photos/31678681@N07/4123997298/

-Mike





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ugordan
post Nov 22 2009, 11:22 AM
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Global view, color balanced according to this calibrated view which shows almost the same view.
Attached Image


The equatorial dark stains are faintly visible above. Here's a narrow-angle segment of the equatorial markings centered around the two craters near image center above, contrast-enhanced IR3/GRN/UV3 color:
Attached Image


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nprev
post Nov 22 2009, 11:30 AM
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Thanks for yet more wonders, Mike & Gordan. (Still overloaded, here!)

I never knew about Rhea's 'lineaments'; what the deuce? Are they analogous to Ganymedian "racetrack" features, albeit at a smaller scale? They're oddly straight.


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Juramike
post Nov 22 2009, 01:58 PM
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Putting Gordan's [IR3,GRN,UV3] image with the the lineament feature [RED,GRN,BL1] image above you get a nice mosaic of the equatorial stains:

Attached Image


(Equatorial stains indicated below:)
Attached Image



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Floyd
post Nov 22 2009, 02:52 PM
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QUOTE (nprev @ Nov 22 2009, 06:30 AM) *
Thanks for yet more wonders, Mike & Gordan. (Still overloaded, here!)
I never knew about Rhea's 'lineaments'; what the deuce? Are they analogous to Ganymedian "racetrack" features, albeit at a smaller scale? They're oddly straight.


There are two other threads that cover this information extensively Link Link

ugordan is the acknowledged discover of the equatorial markings on Rhea for which he received the prestigious award from UMSF Link


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ugordan
post Nov 22 2009, 08:13 PM
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A couple of Rhea cross-eye stereo views:




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nprev
post Nov 22 2009, 08:36 PM
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Ah--How did I forget that? Thanks, Floyd, and apologies, Gordan!

Was just rather taken aback by the appearance of the lineaments in Mike's image; they look like scratches on a dirty crystal ball!


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DrShank
post Nov 25 2009, 09:11 PM
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Yep, the rhea equatorial deposits were also discovered independently by two other teams, including myself. Its really only a matter of time before these things are found out. Ive been doing some high res mapping and am working on some new products showing these things in much better detail. It was the subject of my DPS presentation in october as well, and are the subject of a recent blog on stereomoons.blogspot.com. the alignment indicates they are fallout from Rhea's ring onto the surface. cool huh? stay tuned!
paul


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ngunn
post Nov 25 2009, 10:34 PM
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I've had a question right from almost the start of this thread, the same one I think that appears in post 2. The question was "What are the lineaments?" I thought I'd wait until the answer turned up but it hasn't. All the subsequent discussion has been about the equatorial dark marks - a great subject, I agree. I'm a big fan of rings around moons.

But what are the other lineaments in that image, the thin bright lines at many angles? Rays from impact craters? Scarps? They are very narrow but have an observable finite width in places.
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Phil Stooke
post Nov 26 2009, 12:00 AM
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Like the similar lines radiating from 'Cassandra' in the southern hemisphere of Dione, they are probably straight, narrow fractures exposing fresh ice along the faults. These on Rhea were already seen in Voyager images.

Phil


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Exploitcorporati...
post Nov 29 2009, 06:11 AM
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Hello all...I've clearly missed a lot recently! Incredible stuff.

Better late to the party than never, so here's a mosaic of the tectonized terrain crudely reprojected to the perspective shown in W00061506. I've left out the two disconnected southern frames and the stereo images.

Attached Image


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Hungry4info
post Nov 29 2009, 02:21 PM
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Stunning amount of detail! Great work! Thank-you! smile.gif


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titanicrivers
post Sep 25 2010, 09:40 PM
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Raw images from REV 121 of Titan and Rhea together taken on Nov 19th 2009 featured recently as Cassini browse image ‘Biggest Saturnian Moons’ http://photojournal.jpl.nasa.gov/catalog/PIA12724 provide a natural spectacle and opportunity for us fortunate photoshop users to work with.
Below shows the RGB of Titan. Motion occurred between shots so a cut and paste of Rhea from the browse image
was used. 3D image is one of those eye-crossers again!

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ugordan
post Sep 25 2010, 10:14 PM
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And coincidentally, just a few days before the real raw data for that hits PDS... wink.gif


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