Exquisite Saturn Images |
Exquisite Saturn Images |
Jun 21 2009, 06:26 PM
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#331
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Member Group: Members Posts: 910 Joined: 4-September 06 From: Boston Member No.: 1102 |
Here is a nice image. Note how the rings at the bottom of the image are lit by Saturn, then fade to illumination from the Sun. Some of the rings change from light to dark and other dark to light. As a plus, we even get a moon shadow. Carolyn, special request: Take a set of color images next time--even better, take a color mosaic with the NAC.
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Jun 29 2009, 10:35 AM
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#332
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
I've gone back to the Cassini solar eclipse sequence of Sep 15th, 2006 and did a couple of color shots I haven't seen reproduced elsewhere. First off, for context, is a wide-angle, full resolution RGB shot of Saturn that I posted already, but I've since cleaned up and sanitized the charge bleed flare a bit:
If you click on the above image, you'll be taken to the description page and then if you hover your mouse over the image several inset boxes will appear. Clicking on the text below them will bring you to a narrow-angle color zoom of the limb location. Click "all sizes" to see the wide-angle frame in full resolution. It's twice the resolution of the disc in the official eclipse mosaic and uses actual RGB data, while the official mosaic is based on infrared and UV data. Compare the respective colors each approach gives. Here are direct links to the limb shots (the ones that weren't overexposed badly): They aren't much to look at, but as I said - we don't often get to see Saturn's sunsets like this. The sky around the north pole is a noticeably clearer blue color. Particularly interesting to me is the rightmost one here where a nicely defined, detached haze layer can be seen running around a narrow band across the planet's equator (the terminator itself is overexposed white and has two charge bleeds I attempted to clean up so don't over-analyze any kinks/structure in it). I've seen the haze layer before in some shots, but not in others and this I guess explains why. If you look at the first two images in a dark environment, you can get a hint of the E ring beyond the planet. Brightness settings are individual for each footprint as I wanted maximum brightness without saturation so they are not cross-comparable. -------------------- |
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Jun 29 2009, 12:34 PM
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#333
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Merciless Robot Group: Admin Posts: 8783 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Absolutely stunning, Gordan; thanks!!!
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Jun 29 2009, 02:54 PM
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#334
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Junior Member Group: Members Posts: 57 Joined: 22-March 09 From: West Hartford, Connecicut Member No.: 4691 |
Excellent work on the images, thank you.
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Jul 19 2009, 01:03 PM
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#335
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
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Jul 19 2009, 07:47 PM
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#336
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Senior Member Group: Members Posts: 1582 Joined: 14-October 05 From: Vermont Member No.: 530 |
That photo is beautiful... the framing/cropping is perfect. I know a photo's dramatic when I start humming Also sprach Zarathustra.
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Jul 19 2009, 11:16 PM
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#337
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Not bad ugordan. keep in mind that we are looking over the north polar region at the time, the unlit side of the rings. So north was "up" in the original frames.
This image set certainly makes a great desktop background. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Jul 20 2009, 11:10 AM
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#338
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
That's the north hemisphere? Geez, look away for a few weeks and the blue color vanishes completely. Oh well... Though that would explain why the rings turned out darker than I expected.
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Jul 20 2009, 04:41 PM
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#339
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Yeah, the image was taken while we are above the ring plane.
The blue color is there to an extent. We can definitely see bluish haze over the NP region (actually, it more green, I guess that's what you get when you combine blue haze and yellow atmosphere). Fainter haze can be seen further south, but you are right, it isn't as distinct. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Jul 25 2009, 08:12 PM
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#340
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Senior Member Group: Members Posts: 1630 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Very nice images ugordan. It seems like the blue layer even at the NP is slightly detached, so it isn't simply Rayleigh scattering in a clear atmosphere making the blue as I would have anticipated seeing.
-------------------- Steve [ my home page and planetary maps page ]
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Jul 25 2009, 10:24 PM
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#341
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
That's an instrument artifact, Steve (talking about the image above, not the narrow-angle eclipse frames). Wide-angle blue frames are always more fuzzy than red/green, even when looking at solid objects. These shorter wavelength images also appear to me to have a slight geometric distortion (chromatic aberration?) and one would need to slightly resize them to register with other filters better. I didn't do that above, hence the blue fringe.
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Aug 11 2009, 01:40 AM
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#342
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Junior Member Group: Members Posts: 95 Joined: 11-January 07 From: Amsterdam Member No.: 1584 |
Out of interest I remapped a timelapse sequence of Prometheus moving along the F ring so that it would reveal the gravitational effect over a longer distance.
Please note that the shape of the ring doesn't represent it's actual path. I hope you like it. -------------------- |
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Aug 11 2009, 02:40 PM
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#343
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
You did a beautiful work, phase4!
-------------------- I always think before posting! - Marco -
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Aug 15 2009, 02:45 PM
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#344
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Senior Member Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 |
Very very very hard working on the "raws" of the 12th july mosaic. A lot of shifting between frames because of the move of Cassini during the taken.
See the working space in Gimp : And the final result : There is aways shiftings and exposure adjustment is perfectible, but this is the best I can do now. I think that Gordan will produce a better picture than mine . -------------------- |
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Aug 15 2009, 03:26 PM
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#345
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Member Group: Members Posts: 808 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
ant,
holy guacamole! that is very cool -------------------- CLA CLL
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