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Unmanned Spaceflight.com > Outer Solar System > Saturn > Cassini Huygens > Cassini's ongoing mission and raw imagesRev 139 - Oct 4-28, 2010, Titan, Mimas, Pallene, Dione and Rhea |
 Oct 5 2010, 09:36 PM
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 Senior Member  Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542  |
Images are flowing from Cassini again following conjunction. Here's the ususal handy guide for the next few weeks:
http://www.ciclops.org/view/6570/Rev139 |
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Oct 20 2010, 12:16 PM
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Senior Member Group: Members Posts: 1078 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
Nice shot of Titan and Tethys (?): http://saturn.jpl.nasa.gov/multimedia/imag...4/N00164575.jpg
Part of a sequence that would make a nice animation (hint, hint). Titan is darker than usual on this image. What would be the reason for that? |
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Oct 20 2010, 02:08 PM
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Junior Member Group: Members Posts: 76 Joined: 19-October 05 Member No.: 532 |
QUOTE (charborob @ Oct 20 2010, 12:16 PM)  Nice shot of Titan and Tethys (?): http://saturn.jpl.nasa.gov/multimedia/imag...4/N00164575.jpg Part of a sequence that would make a nice animation (hint, hint). Titan is darker than usual on this image. What would be the reason for that? The images are exposed for Tethys/Enceladus rather than Titan. As ugordon has said these are part of a "Scientist for a Day" observation, the main concern was to make sure Tethys/Enceladus didn't saturate. |
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Oct 20 2010, 03:20 PM
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Junior Member Group: Members Posts: 76 Joined: 19-October 05 Member No.: 532 |
QUOTE (pat @ Oct 20 2010, 03:08 PM) The images are exposed for Tethys/Enceladus rather than Titan. As ugordon has said these are part of a "Scientist for a Day" observation, the main concern was to make sure Tethys/Enceladus didn't saturate. Actually I've dug deeper and the "dark" Titan is mainly down to another cause. Its the automatic compression applied to the raw images again. While Titan is the only thing in the frame the image gets scaled using the brightest Titan pixel as the reference, as soon as Tethys enters the frame its the brightest Tethys pixel thats the top reference. Also this whole observation was done in 12 rather than 8-bit which makes the difference even more dramatic. So you start with an apparently bright Titan and then Titan is much darker as soon as Tethys enters the frame (Tethys being significantly brighter than Titan). |
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Oct 20 2010, 03:46 PM
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 Senior Member Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
QUOTE (pat @ Oct 20 2010, 05:20 PM) Also this whole observation was done in 12 rather than 8-bit which makes the difference even more dramatic. Ahh, so the entire observation (including the CB3 with the awesome cloud) is linear, no LUT encoding? Useful bit of info, thanks 
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Oct 20 2010, 04:58 PM
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Senior Member Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
Mid-transit composite. Titan's disc is actually from earlier on, when there was no Tethys in the frame so better s/n ratio in the jpegs was available.
No alien bases were harmed during production of this image. A ratio of CB3/BL1 frames:
I wonder how familiar a sight it would be to stand there on Titan's surface and look up at those clouds. -------------------- |
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ngunn Rev 139 - Oct 4-28, 2010 Oct 5 2010, 09:36 PM
jasedm Titan, Mimas, Pallene, Dione and Rhea imaging plus... Oct 5 2010, 09:53 PM volcanopele Keep in mind that you are basically looking down t... Oct 18 2010, 06:48 PM
ugordan Yeah, I was just thinking how we already had a som... Oct 18 2010, 06:51 PM jasedm I too am a tad disappointed by the Pallene coverag... Oct 18 2010, 07:40 PM ugordan QUOTE (jasedm @ Oct 18 2010, 09:40 PM) I ... Oct 18 2010, 07:57 PM Juramike HiPassLRGB(GRN polarization 0,60,120) image of Mim... Oct 19 2010, 12:01 AM antipode Hmmmm, what do people make of the curving ridge ru... Oct 19 2010, 06:04 AM ilbasso QUOTE (antipode @ Oct 19 2010, 02:04 AM) ... Oct 19 2010, 01:07 PM Astro0 Pretty spectacular display in the rings!
... Oct 19 2010, 10:11 AM ElkGroveDan QUOTE (Astro0 @ Oct 19 2010, 03:11 AM) Pr... Oct 19 2010, 02:23 PM Hungry4info Wow! Oct 20 2010, 07:24 AM ugordan It looks like a whole 'nuther moon! That s... Oct 20 2010, 07:47 AM remcook Holy cow! Oct 20 2010, 08:04 AM ugordan QUOTE (charborob @ Oct 20 2010, 02:16 PM)... Oct 20 2010, 12:22 PM pat QUOTE (ugordan @ Oct 20 2010, 01:22 PM) O... Oct 20 2010, 02:47 PM ugordan Well, 30-ish frames in 25 mins sounds about right.... Oct 20 2010, 03:01 PM Juramike HiPassLRGB image of Dione taken October 18, 2010. ... Oct 20 2010, 02:02 PM elakdawalla Gordan, when I look at the frames from earlier in ... Oct 20 2010, 05:31 PM ugordan Primarily because those raw images are contrast-en... Oct 20 2010, 05:50 PM ngunn QUOTE (ugordan @ Oct 20 2010, 06:50 PM) t... Oct 20 2010, 10:16 PM ugordan QUOTE (ngunn @ Oct 21 2010, 12:16 AM) Why... Oct 20 2010, 10:31 PM Phil Stooke The brightest horizontal stripe does appear to be ... Oct 20 2010, 05:40 PM elakdawalla Thanks for the explanation -- it's funny what ... Oct 20 2010, 06:23 PM ugordan Yes, the clouds are fairly inconspicuous even in t... Oct 20 2010, 06:25 PM titanicrivers Location of clouds over the anti-Saturn hemisphere... Oct 21 2010, 08:33 AM ugordan Woohoo! The rest of the Scientist for a Day ob... Oct 22 2010, 11:12 AM titanicrivers Neat animation Gordon
And here's a scene that ... Oct 23 2010, 10:02 AM titanicrivers Here's another look at the eastward cloud moti... Oct 24 2010, 07:52 AM |
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