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Saturn's Rings To Shine As Never Before
Guest_Sunspot_*
post Sep 17 2006, 11:11 PM
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Why would they downsample all the images to 512x512 or less?

EDIT: OK I found one that I hoped would be full size:

http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=83290

http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=83288
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alan
post Sep 18 2006, 12:16 AM
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Tethys's shadow is visible in the E-ring blink.gif
Attached Image

Cropped and brightened for this image.
http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=83289
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Jeff7
post Sep 18 2006, 02:42 AM
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QUOTE (Ant103 @ Sep 17 2006, 05:25 PM) *
Vision of dream... ohmy.gif
Note : we see clearly the shadow of the secondary miror of the objective of the camera on the first pic.

This image is simply incredible.
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Ian R
post Sep 18 2006, 05:19 AM
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Is this a new (albeit very faint) ring between the F and G rings?


Attached Image


Could this become known as the H-ring?

http://saturn.jpl.nasa.gov/multimedia/imag...3/W00017882.jpg

Ian.


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dvandorn
post Sep 18 2006, 05:36 AM
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Wow!!!!!

It occurs to me that if we had gotten images from this vantage point early in the orbital phase of the mission, there would have been no doubt whatsoever that Enceladus is the source of the E ring. You can see the ring material flowing off of Enceladus and smoothing itself into the ring quite clearly.

Amazing, amazing images. As someone said nearly 40 years ago of a somewhat similar view of the Moon, it's worth the price of the trip.

-the other Doug


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ugordan
post Sep 18 2006, 06:50 AM
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QUOTE (Ant103 @ Sep 17 2006, 10:25 PM) *
Note : we see clearly the shadow of the secondary miror of the objective of the camera on the first pic.

Nope, that's a wide-angle camera frame. It's a refractor so it doesn't have mirrors. What we're seeing here is possibly the finest image of the calibration lamp and its three supporting rods in front of the optics.

Alan, that Tethys shadow image is awesome, nice catch!
Also, did you notice the complex pattern of the E ring just in the vicinity of Enceladus ("conveniently" caught just at the ring's ansa)? It looks very disturbed.

EDIT: On closer inspection, it's notable the disturbance in the E ring is similar to what Daphnis does. Cassini is above the ring plane (all the images are upside-down) so the orbital motion is counter-clockwise. This implies the ring particles in the inner side have advanced further along their orbit, after being perturbed by Enceladus. The outer edge perturbance is lagging behind the moon. Thus the "wave-like" appearance, though it's not nearly as orderly as with Daphnis, probably because the E ring isn't as confined and is also spread-out vertically. Enceladus is also much more massive than the ring-embedded moons.

This post has been edited by ugordan: Sep 18 2006, 12:35 PM


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djellison
post Sep 18 2006, 06:59 AM
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QUOTE (Sunspot @ Sep 18 2006, 12:11 AM) *
Why would they downsample all the images to 512x512 or less?


Well - they didn't do all of them - but the reason is storage capacity I believe.

Doug
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dilo
post Sep 18 2006, 11:11 AM
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QUOTE (alan @ Sep 18 2006, 12:16 AM) *
Tethys's shadow is visible in the E-ring blink.gif

Really a good catch, alan. Herebelow, a processed version of your cropped area within the original context image...
Attached thumbnail(s)
Attached Image
 


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TritonAntares
post Sep 18 2006, 12:33 PM
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Hi,
wow really impressive pics!!!

Does anybody know a link for a larger version of this overview...

...of the mosaik?

I'm just asking for indentification purposes of all these objects around Saturn - its moons and the visible 'inner planets'.

THX & Bye.
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dilo
post Sep 18 2006, 12:50 PM
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QUOTE (dilo @ Sep 18 2006, 11:11 AM) *
Really a good catch, alan. Herebelow, a processed version of your cropped area within the original context image...

...and this is the rgb composition of the same field (with lower exposure time); there isn't Thetys's shadow but show the amazing Enceladus envelope:
Attached Image
(original images: W0017910/911/912)

An alternative view of the E/G rings with "extended range" colors (ir3+clear+violet filters), suggesting a compositional difference between inner and outer E ring and respect to G ring:
Attached Image
(W00018033+enlarged W00018035/036)

Finally, this is a collection of "high dynamic range" images based on the combination of 3 clear filter pictures taken with different exposure time (red channel correspond to the weakest details):
Attached Image
Attached Image


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alan
post Sep 18 2006, 12:57 PM
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QUOTE (Ian R @ Sep 18 2006, 12:19 AM) *
Is this a new (albeit very faint) ring between the F and G rings?


Attached Image


Could this become known as the H-ring?

http://saturn.jpl.nasa.gov/multimedia/imag...3/W00017882.jpg

Ian.

Good eyes. The "H-ring" looks like its at the same distance as Janus and Epimeteus.
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ugordan
post Sep 18 2006, 01:17 PM
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QUOTE (dilo @ Sep 18 2006, 01:50 PM) *
An alternative view of the E/G rings with "extended range" colors (ir3+clear+violet filters), suggesting a compositional difference between inner and outer E ring and respect to G ring:

That's a nice view! I'm more inclined to say it doesn't mean compositional differences as much as variations in average ice particle size - the smaller the particles, the more shorter wavelengths are scattered and the ring appears bluish. Though, the result here will be less useful as we don't know the different exposures used and thus relative brigthnesses at different wavelengths.


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Ant103
post Sep 18 2006, 04:58 PM
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Two pictures to add into this spectacular Cassini gallery.

Sun eclipse by Saturn at different exposures :
Attached Image


And the "Pitch Black Like" scenery with three other images :
Attached Image


That's a little science fiction rendering.


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dilo
post Sep 18 2006, 06:02 PM
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QUOTE (ugordan @ Sep 18 2006, 01:17 PM) *
That's a nice view! I'm more inclined to say it doesn't mean compositional differences as much as variations in average ice particle size

Absolutely agree. In fact, I was speaking not only of chemical composition but also (and especially) dimensional composition. Such differences were already highlighted inside main rings, now are evident also here due to favorable illumination.
Note that the bluish color of internal E-ring is barely visible also in the rgb image. This suggests that finer particles populates this region (eventually spiraling toward Saturn)... any idea on the dynamic of this segregation?


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dilo
post Sep 18 2006, 06:09 PM
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Ant103, great work!
Is really a little science fiction rendering! ohmy.gif
If I'm not wrong, in the second (coulor) image I see some bright, long features inside the Enke division...
Do someone has any idea on their origin?


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