Exquisite Saturn Images |
Exquisite Saturn Images |
Jul 12 2006, 09:37 AM
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#1
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Member Group: Members Posts: 562 Joined: 29-March 05 Member No.: 221 |
There are some gorgeous crescent saturn images coming down in the raws at the moment.
You can really see how oblate saturn is. |
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Jul 12 2006, 03:12 PM
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#2
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Yep...some lucky tourists will pay the big bucks to see that in person around the year 2300 or so...
-------------------- 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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Jul 12 2006, 06:32 PM
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#3
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Junior Member Group: Members Posts: 29 Joined: 11-July 06 From: Springville, UT Member No.: 965 |
The oblation is what struck me, too.
What are we seeing in the images that alternate with with crescent shots? I assume it's the cloud tops, and the black band at the bottom is the shadow of the rings or the rings themselves. -------------------- |
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Jul 12 2006, 06:39 PM
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#4
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Junior Member Group: Members Posts: 29 Joined: 11-July 06 From: Springville, UT Member No.: 965 |
Yep...some lucky tourists will pay the big bucks to see that in person around the year 2300 or so... Definitely. Meanwhile, we'll have to be grateful for whoever at JPL takes the trouble to post the feeds. -------------------- |
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Jul 12 2006, 07:00 PM
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#5
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Junior Member Group: Members Posts: 73 Joined: 14-June 05 From: Cambridge, MA Member No.: 411 |
Yes, whoever does that is an unsung hero.
Notice the tiny black dot in the upper left of the crescent? In a similar image released last week Ciclops such a dot was identified as Epimetheus. I wonder if that's what it is here or perhaps another satellite? |
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Jul 12 2006, 09:38 PM
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#6
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
What is that little white dot at the bottom of the image?
-------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Jul 13 2006, 06:41 AM
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#7
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Notice the tiny black dot in the upper left of the crescent? If you turn the brightness up you can see that it's actually the rings intersecting the disc, not a moon. EDIT: A shot that does show a moon, Titan alonside Saturn's right limb. http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=79245 The bottom of the image was unfortunately clipped off on the spacecraft during readout. -------------------- |
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Jul 24 2006, 08:03 PM
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#8
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Member Group: Members Posts: 295 Joined: 2-March 04 From: Central California Member No.: 45 |
There are some gorgeous crescent saturn images coming down in the raws at the moment. You can really see how oblate saturn is. Exquisite image. It's interesting though how much 'noise' there is in the image, it appears they have barely 50% of the frame to work with...see attached image of W00016082 with the gamma correction turned way up. Do they use a mask of some sort to clean the lens smears and such? -------------------- Eric P / MizarKey
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Jul 24 2006, 08:06 PM
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#9
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
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Jul 27 2006, 08:36 AM
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#10
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Member Group: Members Posts: 562 Joined: 29-March 05 Member No.: 221 |
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Jul 27 2006, 09:26 AM
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#11
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
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Jul 27 2006, 09:46 AM
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#12
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Member Group: Members Posts: 562 Joined: 29-March 05 Member No.: 221 |
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Jul 27 2006, 09:52 AM
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#13
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
That would be a blue image on the left and a methane band ( I think ) filter on the right. I did try the methane band images, but they have been 2x2 downsampled
Doug |
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Jul 27 2006, 09:58 AM
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#14
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Member Group: Members Posts: 562 Joined: 29-March 05 Member No.: 221 |
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Jul 27 2006, 10:06 AM
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#15
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
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Jul 27 2006, 10:38 AM
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#16
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Member Group: Members Posts: 562 Joined: 29-March 05 Member No.: 221 |
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Jul 27 2006, 12:32 PM
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#17
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Member Group: Members Posts: 125 Joined: 18-July 05 Member No.: 438 |
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Aug 2 2006, 10:04 AM
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#18
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
-------------------- |
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Aug 2 2006, 11:53 AM
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#19
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Below my personal attempt to process the two wide-angle crescent images W00016128 and W00016686 (for the last one, in reality, i used RGB images W00016687/8/9 and I made also an enhanced color version):
-------------------- I always think before posting! - Marco -
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Aug 2 2006, 12:37 PM
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#20
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Founder Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 |
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Aug 2 2006, 08:27 PM
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#21
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Member Group: Members Posts: 249 Joined: 11-June 05 From: Finland (62°14′N 25°44′E) Member No.: 408 |
Here's the best I could do with the latest set of raws images from Cassini: Wonderful! Looks like a bad b&w scan of a Chesley Bonestell painting. -------------------- The universe is not only stranger than we imagine, it is stranger than we can imagine.
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Aug 14 2006, 02:15 PM
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#22
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Member Group: Members Posts: 562 Joined: 29-March 05 Member No.: 221 |
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Aug 14 2006, 05:24 PM
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#23
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Member Group: Members Posts: 809 Joined: 11-March 04 Member No.: 56 |
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Aug 16 2006, 04:17 PM
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#24
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
A dirty wide angle RGB mosaic from near the ring plane (groan, again!) with a moon I can't quite identify. Might be Rhea judging by the size, I dunno.
-------------------- |
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Aug 16 2006, 07:57 PM
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#25
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Senior Member Group: Moderator Posts: 3234 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Nice mosaic!
Even though we are in a more inclined orbit, we do cross the ring plane twice an orbit -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Aug 17 2006, 08:46 AM
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#26
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
there were some nice ring images taken last time I checked the raw images...
edit - some actual links: http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=80681 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=80448 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=80417 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=80425 also nice (there are multiple filters of these it seems! looking forward to seeing this in colour - wink wink nodge nodge ;-) ): http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=80722 |
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Aug 20 2006, 11:36 AM
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#27
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
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Sep 7 2006, 08:08 AM
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#28
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Oct 6 2006, 03:24 AM
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#29
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Here's the latest six-frame mosaic:
It really is a pity that the WAC doesn't seem to have an adequate enough sun shield. -------------------- |
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Oct 6 2006, 06:23 AM
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#30
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Beautiful images, Ian!
-------------------- I always think before posting! - Marco -
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Oct 13 2006, 07:40 AM
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#31
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Not exactly crescent images, but these raws are just... wow!
South pole vortex, appears oval: http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=85891 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=85879 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=85875 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=85874 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=85872 -------------------- |
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Oct 24 2006, 07:46 PM
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#32
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
...and now look at this:
http://saturn.jpl.nasa.gov/multimedia/imag...4/W00019111.jpg A true example of Cassini modern art...! -------------------- I always think before posting! - Marco -
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Oct 24 2006, 07:58 PM
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#33
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
...and now look at this: http://saturn.jpl.nasa.gov/multimedia/imag...4/W00019111.jpg A true example of Cassini modern art...! Jason must have been out late last night. I'm sure after a few cups of coffee the images will be back to normal. -------------------- If Occam had heard my theory, things would be very different now.
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Oct 24 2006, 08:05 PM
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#34
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Senior Member Group: Moderator Posts: 3234 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Jason must have been out late last night. I'm sure after a few cups of coffee the images will be back to normal. Saturn images are not my responsibility. I take no responsibility for any problems (or fantastic backlit mosaics) that might be associated with Saturn. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Oct 24 2006, 09:05 PM
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#35
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Junior Member Group: Members Posts: 48 Joined: 10-February 05 Member No.: 166 |
...and now look at this: http://saturn.jpl.nasa.gov/multimedia/imag...4/W00019111.jpg A true example of Cassini modern art...! Oh gosh! There's more cruft in the optics than I thought. |
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Oct 25 2006, 05:56 AM
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#36
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Member Group: Members Posts: 599 Joined: 26-August 05 Member No.: 476 |
South pole vortex, appears oval: http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=85891 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=85879 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=85875 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=85874 http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=85872 Aiiieee!!! The Shoggoths!!! |
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Oct 31 2006, 06:10 AM
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#37
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
New amazing Saturn/rings pictures obtained on Oct,30 with Blu and Violet filters...
Here an examples from wide cam: Narrow cam details: and atmosphere 3D structures with enhanced local contrast (CB3 filter): -------------------- I always think before posting! - Marco -
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Oct 31 2006, 06:03 PM
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#38
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Check out the terminator region on top of this image:
http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=87366 -------------------- |
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Oct 31 2006, 08:33 PM
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#39
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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Nov 1 2006, 01:16 AM
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#40
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Member Group: Members Posts: 809 Joined: 11-March 04 Member No.: 56 |
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Nov 1 2006, 07:26 AM
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#41
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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Nov 5 2006, 11:22 AM
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#42
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
-------------------- |
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Nov 5 2006, 11:33 AM
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#43
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
Are my eyes playing tricks on me, or do some of those clouds have discernible shadows, suggesting that they're projecting a considerable height above a lower cloud layer? Saturn has a very "deep" atmosphere. The cloud-level gravity is actually only slightly greater than Earth's, and at cloud depths, the temperature is comparable to that of Earth's cloud levels. But Saturn has the lowest molecular weight atmosphere of any in the solar system -- almost pure H2. Simply put, that gives Saturn about 7 times the scale height of Earth, so cloud phenomena get some tremendous vertical stretching. |
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Nov 12 2006, 12:13 PM
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#44
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
A rather colorful north polar area on Saturn is revealed in these WAC RGB composites. The unlit rings are too dim to be visible here without severe compression artifacts.
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Nov 12 2006, 07:28 PM
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#45
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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Dec 10 2006, 09:19 AM
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#46
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
A manual stitch from some clear filter images taken on Dec,06 (original picures W00020421/26/34/32):
Colorization is, in reality, a sort of false color coding from original B/W. (There are also nice G-ring pictures) -------------------- I always think before posting! - Marco -
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Jan 21 2007, 04:43 AM
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#47
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Jan 21 2007, 05:14 AM
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#48
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Yay! That's the Saturn shot I've been waiting for since I saw the plans for the tour and noticed the high inclination orbits. Too bad the raws are so saturated -- hope the actual data shows more subtlety in Saturn's disk.
--Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Jan 21 2007, 09:56 AM
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#49
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Emily - there's quite a bit of detail in the region of Saturn's terminator, especially near the North pole where there are several bands and lots of clouds visible.
So far so good... -------------------- |
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Jan 21 2007, 06:04 PM
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#50
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Member Group: Members Posts: 408 Joined: 3-August 05 Member No.: 453 |
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Jan 25 2007, 11:03 AM
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#51
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
After hours of hard work (don't forget that this is my first ever attempt at producing a colour mosaic on this kind of scale), here is Saturn in all its glory!
http://img442.imageshack.us/my.php?image=s...ianregan6jl.jpg There are still a few tweaks to be made, of course, and I hope to post the final version at the weekend. Enjoy! Ian. -------------------- |
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Jan 25 2007, 11:08 AM
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#52
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Wow! Extremely impressive work!
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Jan 25 2007, 11:18 AM
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#53
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IMG to PNG GOD Group: Moderator Posts: 2251 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
Looks great! One 'error' I noticed though is that the rings are brighter at upper right than in the lower left half of the image. The rings should be noticeably brighter in the lower left half than elsewhere due to Saturnshine - maybe one of the tweaks left to do.
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Jan 25 2007, 11:21 AM
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#54
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Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
That is totally awesome! Great work, hard to believe that's your first!
I wish I had time to play with Cassini images, but I see there is no need anyway with all the great stuff being done by you lot James -------------------- |
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Jan 25 2007, 11:25 AM
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#55
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Awesome! I didn't think the footprints would align well but you made it look seamless! Great work!
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Jan 25 2007, 11:41 AM
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#56
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Rover Driver Group: Members Posts: 1015 Joined: 4-March 04 Member No.: 47 |
cool!
in the top right, are those moving moonlets (a similar effect as the dust devils by Mars Express)? |
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Jan 25 2007, 11:45 AM
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#57
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Yep, looks like Prometheus and Pandora and either Janus or Epimetheus.
-------------------- |
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Jan 25 2007, 08:08 PM
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#58
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Bravissimo!
-------------------- I always think before posting! - Marco -
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Jan 25 2007, 09:12 PM
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#59
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
Too bad all I get is an Imageshack page with a link to host my own pictures, but no image...
-the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Jan 27 2007, 01:08 AM
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#60
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Junior Member Group: Members Posts: 29 Joined: 11-July 06 From: Springville, UT Member No.: 965 |
With his permission, I've featured Ian's work on the Riding with Robots site.
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Jan 27 2007, 07:53 AM
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#61
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Chief Assistant Group: Admin Posts: 1409 Joined: 5-January 05 From: Ierapetra, Greece Member No.: 136 |
BRAVO Ian, on a magical job, it's a very inspiring view you provided
Nico -------------------- photographer, space imagery enthusiast, proud father and partner, and geek.
http://500px.com/sacred-photons & |
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Jan 28 2007, 03:17 AM
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#62
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Member Group: Members Posts: 548 Joined: 19-March 05 From: Princeton, NJ, USA Member No.: 212 |
Ian, absolutely glorious !!!!
I'd like to use this for my Cassini talk at a Planetarium in 2 weeks (with credit to you, NASA etc), assuming thats OK. Cant wait to see your latest and greatest ken |
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Feb 1 2007, 12:36 PM
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#63
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Apparently, the raws page houses at least two nice global views from above. One is the one Emily mentioned in her blog and Ian superbly mosaicked, and the other is a higher phase view and looking down from a higher inclination. I ran across it on an Astronomy Blog, the author still seems to be working on it, but it promises to look equally impressive.
I can't wait till this stuff hits the PDS. -------------------- |
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Feb 1 2007, 07:18 PM
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#64
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Member Group: Members Posts: 548 Joined: 19-March 05 From: Princeton, NJ, USA Member No.: 212 |
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Feb 1 2007, 10:28 PM
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#65
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
I'd like to thank both Emily and Bill for kindly displaying the Saturn mosaic on the Planetary Society blog and the Riding With Robots website. It certainly makes all of the hours invested in the creation of the image worthwhile!
The wonderful repsonse from the UMSF stalwarts here is also greatly appreciated, and hopefully I will get around to implementing the suggestion that Bjorn made sometime soon. I am only an amateur at this game, with a minimal amount of knowlegde in the image processing field, so I welcome all constructive critiscism from the resident gurus and experts here. I did see the second mosaic in the Cassini raw directory, but decided against putting that version together since I was so burnt-out from doing the first one. I'm pleased to see that someone else is putting the necessary time and effort needed to make sure that this Saturn portrait gets properly reproduced too. Finally, Ken, of course you are welcome to use the composite in your lecture - thank you for being such a gentleman to ask permission in the first place. In general, I don't mind at all if people use my work without seeking my approval, but to go that one extra step is certainly a sign of pure class. Good luck with the lecture! Ian. -------------------- |
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Feb 1 2007, 11:36 PM
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#66
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 2 2007, 06:32 AM
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#67
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Great work Ian, one more time!
-------------------- I always think before posting! - Marco -
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Feb 2 2007, 07:32 PM
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#68
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Senior Member Group: Members Posts: 1585 Joined: 14-October 05 From: Vermont Member No.: 530 |
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Feb 2 2007, 08:07 PM
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#69
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Stunning work Ian, many congratulations!
Like Ken I'd like to ask your permission to show your image to others. I'm giving talks in 4 different junior schools next week, and also speaking to two community groups, and I'd love to show them your pic. Is that ok? -------------------- |
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Feb 3 2007, 12:06 AM
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#70
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Yes, of course Stu - go for it!
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Feb 3 2007, 12:46 AM
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#71
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 3 2007, 01:04 AM
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#72
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 3 2007, 01:58 AM
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#73
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I downloaded the frames for those in case I found the time to try to put them together -- but you beat me to it -- and did a much nicer job than I would have managed to! Keep it up!
Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Feb 3 2007, 06:29 PM
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#74
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Thanks Emily. I sure the colour balance isn't correct, and that Bjorn or ugordon could do a better job in that respect, but despite that, I'm quite pleased with the results so far.
My latest composite is a natural colour view of the south pole: Cheers! Ian. -------------------- |
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Feb 3 2007, 07:22 PM
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#75
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Poetry in space.... Ian, Bravo again!
Edit: removed the quoted section and added a enhanced version (not realistic, only in order to highlight atmospheric features and chromatic differences): -------------------- I always think before posting! - Marco -
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Feb 3 2007, 07:35 PM
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#76
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Ian, these are just stunning, really...incredible. It's the next best thing to being there, which probably none of us will ever get to do, so thank you very much!
-------------------- 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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Feb 4 2007, 08:50 PM
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#77
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 4 2007, 09:27 PM
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#78
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Ian, these are just stunning, really...incredible. It's the next best thing to being there, which probably none of us will ever get to do, so thank you very much! Thanks nprev - I'm really flattered by your very kind words! I'm having a great deal of fun with the Cassini imagery at the moment, as you can no doubt see. Ever since I first discovered this website, I have wondered and marvelled at the fantastic work done by the other members here - it's amazing to see so much talent in a single forum. It's very rewarding for me to finally be able to give a little bit back to the community that has provided me with so many truly great images over the past 18 months or so. -------------------- |
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Feb 5 2007, 01:34 AM
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#79
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Here's a short GIF animation showing Cassini approaching the ring plane from below. Note how several atmospheric features can be seen moving from West to East during the sequence:
Zooming in on the northern hemisphere: Ian. -------------------- |
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Feb 5 2007, 02:08 AM
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#80
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 5 2007, 02:23 AM
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#81
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Senior Member Group: Moderator Posts: 2262 Joined: 9-February 04 From: Melbourne - Oz Member No.: 16 |
More amazing stuff , thanks a lot Ian.
James -------------------- |
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Feb 5 2007, 02:36 AM
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#82
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 5 2007, 02:55 AM
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#83
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 5 2007, 04:01 AM
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#84
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
Ian this is great work. For some reason people have been somewhat shy of processing the Saturn images. I am glad you have stepped up to the plate and really taken on this task. Keep up the good work.
EDIT: My wife who isn't all that interested in my UMSF hobby, just glanced over my shoulder and declared "Oh, now that's nice." -------------------- If Occam had heard my theory, things would be very different now.
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Feb 5 2007, 11:36 AM
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#85
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
This is some fine work you're putting out Ian! The only comment I have is the output is a bit too blue-tinted. My goofing around with VIMS spectrometer data (check out the lower Saturn pic here, it's a similar viewpoint) to get more accurate colors basically suggests a "true color" appearance very similar to this CICLOPS view, though the saturation in that image might be a bit too high.
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Feb 5 2007, 07:40 PM
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#86
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 5 2007, 07:59 PM
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#87
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
This is some fine work you're putting out Ian! The only comment I have is the output is a bit too blue-tinted. My goofing around with VIMS spectrometer data (check out the lower Saturn pic here, it's a similar viewpoint) to get more accurate colors basically suggests a "true color" appearance very similar to this CICLOPS view, though the saturation in that image might be a bit too high. I do plan to go back and adjust the colour balance of these images at some point, so thanks for the pointer Gordon. Unfortunately, the stretching that is applied to these raw JPEGs means that two views that should have identical contrast, hue and saturation, end up all over the place. What do you suggest is the best way to correct the colour in these images? Should I manually adjust the brightness and contrast of the B&W raws, or should I simply change the Red/Green/Blue values of the resultant composite? Cheers, Ian. -------------------- |
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Feb 5 2007, 09:00 PM
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#88
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
When I do raw processing, I composite each footprint individually (aligning the 3 channels basically) and then paste them all into one image in Photoshop as different layers. Then comes the adjusting each footprint's color channel to match all others. Once they all match up (more or less), you can flatten the image and do brigthening/dimming of each channel to approximate the calibrated output. A calibrated output will have Saturn a dullish-yellow color, not fancy colors. You can then mix the three channels sensibly to produce a satisfactory result. Mixing will wash out saturation, but you can always increase that up later. Admittedly, it's a lot of work to work with raws and I personally kind of lost the interest to do it twice, first with raws and then do it the "proper" way once the data hits PDS.
BTW, that latest image is great! It's so Voyager-esque. In fact, you can use that moon that's visible to correct the colors a bit, make it turn white and you'll have colors closer to calibrated ones. Usually you can't rely on stuff like that, though. Did you use the violet or blue filter, this looks to me like it's violet? Cassini spent so much time on the night side that I lost track of just how south ring shadows have actually moved. I took the liberty of tweaking your image a bit, I hope you don't mind: It's just way cool -------------------- |
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Feb 5 2007, 09:37 PM
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#89
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
I taken some liberty too; still not perfectly matched with Gordan reccomandation, but a little more realistic.
Thanks again, Ian. -------------------- I always think before posting! - Marco -
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Feb 6 2007, 03:38 AM
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#90
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
Wow, great stuff!
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Feb 6 2007, 04:22 AM
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#91
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Member Group: Members Posts: 548 Joined: 19-March 05 From: Princeton, NJ, USA Member No.: 212 |
Here's a short GIF animation showing Cassini approaching the ring plane from below. Note how several atmospheric features can be seen moving from West to East during the sequence: [ Ian, everything in your latest posts is exquisite. Well thank you for the OK and I'd may like to use a few more like the gif too. Gee I have to revise the entire Saturn portion of my talk set for Feb 14 in Philadelphia! forum members welcome http://www.rittenhouseastronomicalsociety.org/meetings.htm Suggestion: can you slow down the gif somewhat please? I think it will help the audience appreciate and understand more easily. thanks ken |
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Feb 6 2007, 05:54 AM
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#92
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SewingMachine Group: Members Posts: 316 Joined: 27-September 05 From: Seattle Member No.: 510 |
Jaw-dropping, amazing work, everyone! I've been waiting for these perspectives for years. One question for ugordan specifically regarding the natural color views: Looking at the difference between your processed images of Saturn and JPL's, the pronounced blue tones in the northern hemisphere seem much more muted in yours. I know next to nothing of the characteristics of the filters or the technical aspects of combining them, but what would we actually see If we were there? I've had many questions from friends about that unearthly (and once-unsaturnly) blue, as it gives the place an unfamiliar look to them. I'm inclined to guess your processing is more accurate, especially as you've cranked out hordes of wonderful color products that JPL seems averse to releasing. Anyways, congrats to Ian, yourself, and others in this thread. I will certainly have a difficult time kicking you off of my desktop.
-------------------- ...if you don't like my melody, i'll sing it in a major key, i'll sing it very happily. heavens! everybody's all aboard? let's take it back to that minor chord...
Exploitcorporations on Flickr (in progress) : https://www.flickr.com/photos/135024395@N07/ |
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Feb 6 2007, 07:04 AM
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#93
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 6 2007, 08:29 AM
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#94
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Exploitcorporations, I can't really say my processing is all that more accurate than JPLs as there are a few things to consider here: The colors in my latest Saturn images in the gallery are based on my experiments with VIMS data and choosing channel mixes to resemble that as closely as possible. I've still to figure out the best mix, but I'm working toward it. If anything, the blue cranium might be a bit too subtle in some of my views. The other thing that might affect your perception is I have a lot of high phase Saturn composites there and I think the blue tones aren't in reality as pronounced in those views. I also tried to keep the saturation lower to match the softness of the VIMS views, especially when a proper 2.2 gamma is applied.
That said, I do believe CICLOPS went overboard with saturation on a few color composites, making other Saturn shots weirdly yellow and dull compared to those. For reference, here are two of my ISS views that closely resemble results using VIMS: Ring Shadows 1 and Saturn's North. Compare the second one with the Blue Cranium official release. Just for a quick reference, here are some of VIMS results with a slightly lower gamma and compare the intensity of the colors there. Also, a VIMS mosaic of the blue cranium from a low phase angle. -------------------- |
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Feb 6 2007, 10:12 AM
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#95
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Senior Member Group: Moderator Posts: 3234 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
If it is any consolation, ugordan, that's what I always get for my Saturns, a more grayish northern hemisphere than bluish.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Feb 6 2007, 10:25 AM
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#96
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
A simple RGB composite will tend to give you that, but you'd need to mix the channels in a right ratio to compensate for the effect of different bandpasses and the fact green channel overlaps quite a bit with the other two. It comes down to sensibly "fudging" to match what the scene actually looks like. Worse, different targets often require different mixes -- Jupiter would turn out quite weird with the same mix as used on Saturn, even with the same filter sets. The "correct" mixes might even vary with phase angle, but I might be wrong on that one.
Really, you loose a bit of "true" color information by using only three color snapshots (opposed to full visible spectra) and that's why I give more weight to VIMS produced colors as they are more "scientific", taking into consideration human eye specifics. Especially since they pass reality checks such as white Enceladus and gray Mimas. Neglecting weird bluish Venus colors and a brownish Moon here. But, yeah, I think some of you at CICLOPS might have gotten a bit carried away with a few composites. -------------------- |
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Feb 6 2007, 08:07 PM
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#97
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SewingMachine Group: Members Posts: 316 Joined: 27-September 05 From: Seattle Member No.: 510 |
Thanks ugordan for the insights. I missed your referenced VIMS post...very interesting stuff. I need to study up on gamma correction. As an aside, no offense intended toward CICLOPS, especially regarding the icy satellite mosaics. The only important colors there are the sickly green of envy (VP-that's your mosaic of Enceladus from the Feb. 2005 NT encounter? Mine still looked like a Hockney collage after two years of struggle!) and the cool auzere of the blue screen of death.
-------------------- ...if you don't like my melody, i'll sing it in a major key, i'll sing it very happily. heavens! everybody's all aboard? let's take it back to that minor chord...
Exploitcorporations on Flickr (in progress) : https://www.flickr.com/photos/135024395@N07/ |
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Feb 6 2007, 09:20 PM
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#98
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Waiting for another Ian stunning stitch, I played with the last pictures taken on Feb,6:
First one is an RGB combination, the latter is a pseudo-color image based on MT3, green and B3 filters. -------------------- I always think before posting! - Marco -
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Feb 7 2007, 05:27 AM
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#99
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Oooh, very pretty indeed dilo!
Here's my composite, with colour adjustment based on Gordan's earlier advice: -------------------- |
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Feb 7 2007, 05:40 AM
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#100
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
... BTW, that latest image is great! It's so Voyager-esque. In fact, you can use that moon that's visible to correct the colors a bit, make it turn white and you'll have colors closer to calibrated ones. Usually you can't rely on stuff like that, though. Did you use the violet or blue filter, this looks to me like it's violet? Cassini spent so much time on the night side that I lost track of just how south ring shadows have actually moved. I took the liberty of tweaking your image a bit, I hope you don't mind Gordan, Interesting indeed to read your account of assembling Cassini colour composites. With the mosaics that consist of two footprints only, my approach has always been to carefully align and join the Green raw images first, and then to use that as a geometric template for aligning the Red and Blue channels. All of these images use RGB - I haven't actually tried the Violet filter yet, and probably wouldn't anyway, unless the Blue image was missing or corrupt. In any case, the colour adjustments you and Dilo have applied to the mosaics look great! Cheers. -------------------- |
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