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Rev 49 - Aug 9-Sep 14, 2007 - Iapetus I1, The only close flyby of Iapetus
elakdawalla
post Sep 7 2007, 05:46 PM
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[Moderator's note: This thread contains images from the Iapetus 2007-09-10 flyby and discussion of them. It was created by splitting this thread which contains pre-flyby discussion]


Another CL-UV3-GRN-IR1 set was posted today, though Iapetus seems to have been hiding from the green and IR filters...here's my best effort at making something from the CL and UV3 images. Lots of topography on the limb!

--Emily
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Guest_AlexBlackwell_*
post Sep 7 2007, 05:48 PM
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QUOTE (elakdawalla @ Sep 7 2007, 07:46 AM) *
...though Iapetus seems to have been hiding fromt he [sic] green and IR filters...

TED!!!!!! Should I or shouldn't I?? biggrin.gif
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ugordan
post Sep 7 2007, 05:48 PM
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I actually like the color in this one best. The stretched color views tend to oversaturate Cassini Regio.

Here's a quick collage of some of the lowest and some of the highest resolution color imagery we got of Iapetus in the past 3 years:


To think that in less than 4 days we'll have images with resolutions up to 1000 times better than the best shown here is exciting to say the least.


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volcanopele
post Sep 8 2007, 07:32 AM
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ISS_049IA_IAPETUS002_CIRS is now on the ground:

Clear Filter Frame: http://saturn.jpl.nasa.gov/multimedia/imag...iImageID=125907

This was supposed to include a true color filter set (BL1, GRN, and RED), but it looks like the shutter times were a tad off and the RED and IR2 images were taken after CIRS pointed away from Iapetus (it points away from its target at the start and end of observations for calibration purposes). However, there is a UV3-GRN-IR1 filter set available from some industrious individual. The auto stretch feature appears to be working now so you guys should be able to do something with this data set.

Some interesting topography is visible in the crescent seen here, including the impact basin in south-central Cassini Regio, a pair of ridges to the northwest of the impact basin in north-central Cassini Regio (these things need names!!), and the equatorial ridge.

You know what, that's it, I am instituting a system of nicknames for the impact basins on Iapetus. These are just nicknames. In keeping with the official naming scheme for Iapetus, characters and places from the Song of Roland, all the nicknames will be predominately French. Map upcoming.


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CAP-Team
post Sep 8 2007, 08:45 AM
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Here's an IR3/GRN/BLU combination image from 7 september:

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volcanopele
post Sep 8 2007, 09:13 AM
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Here is a map of official names (in green) and nicknames (in red):

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TritonAntares
post Sep 8 2007, 10:39 AM
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Frosty, Sam, Yukon, Cornellis - doesn't sound french at all... blink.gif
Anxious about calling the whole crater triplet Snowman - or say better in french:
bonhomme de neige... wink.gif

I think IAU will get in trouble creating names from 'The Song of Roland', simply because of a limited number of characters there!

Nomenclatura in french seems to be one solution.
I personally would prefer naming surface structures after their appearance, like the Snowman for instance.

Bye.
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scalbers
post Sep 8 2007, 02:05 PM
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Nice to have CAP-Team's image and VP's names for reference. I think I can see Lionel on the terminator of the 9/7 image and maybe Jeanne near the limb. The NNE edge of Henri may be a spot where the bellyband diminishes eastward (into a flat area) and we thus would be seeing a shadowed slope along the bellyband in the image. If we can make out as far as the SW edge of Henri that could fill in a blank sliver on the map.

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I'll go ahead and opine that we might eventually want a "Claudette" just to the east of "Claude" wink.gif


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CAP-Team
post Sep 8 2007, 04:00 PM
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this is a simulated view, using VP's map with nicknames in Xplanet:

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tasp
post Sep 8 2007, 04:52 PM
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May I propose refering to the large elongated crater S of Joan on the edge of Casini Regio as Papillion ??

thanx for the consideration
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volcanopele
post Sep 8 2007, 04:59 PM
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QUOTE (TritonAntares @ Sep 8 2007, 03:39 AM) *

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Frosty, Sam, Yukon, Cornellis - doesn't sound french at all... blink.gif
Anxious about calling the whole crater triplet Snowman - or say better in french:
bonhomme de neige... wink.gif

Nomenclatura in french seems to be one solution.
I personally would prefer naming surface structures after their appearance, like the Snowman for instance.
It's Frosty, Sam, and Yukon Cornelius, btw... All the names have a French theme, except those. They are named after famous (in the US) snowmen. Frosty is obviously from Frosty the Snowman, and Sam and Yukon Cornelius are from the annual TV holiday special, Rudolph, the Red-Nosed Reindeer.


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Decepticon
post Sep 8 2007, 07:03 PM
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ugordan Your image is amazing! I appreciate the effort to make that montage. smile.gif
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Decepticon
post Sep 9 2007, 04:43 AM
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Great News! New pics!
WOW! http://saturn1.jpl.nasa.gov/multimedia/ima...3/N00091644.jpg


My sad attempt at stacking. sad.gif
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elakdawalla
post Sep 9 2007, 05:24 AM
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Great stuff! Sadly the sole long-wavelength image seems to have missed, so I had to fudge for the red channel. The version below consists of clear for red, a stack of four green images for the green (clear plus 3 polarizers), and, for blue, the UV3 channel with cosmic ray hits erased or corrected for by copying bits from the polarized channels where cosmic rays hit the sunlit part of Iapetus. Then I converted to Lab, replaced the lightness with the clear image, and went back to RGB.
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That's some pretty rumply looking topography in the southern hemisphere basin! The "belly band" seems to look sorta segmented, with little north-south notches cut into it.

--Emily


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volcanopele
post Sep 9 2007, 05:58 AM
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The South-central Cassini Regio impact basin ("Henri") appears to have a central massif, which matches with the morphology of similar basins in north-central Cassini Regio ("Aimee") and northeastern Cassini Regio ("Joan").

Not sure what is up with the equatorial ridge.


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