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Rev 127 - Feb 22-Mar 12, 2010 - Rhea R2 and Helene, Also distant Iapetus
volcanopele
post Mar 3 2010, 10:19 PM
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Well, the issue might have been not so much the pointing, but our understanding of the position of Helene... mean, we were pointed where we planned it, but Helene was not where we expected it to be. High resolution images such as these presumably will also be used to help refine our knowledge of the orbit of Helene.


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jasedm
post Mar 3 2010, 10:21 PM
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One of the better global raws, rotated so the large crater is at the top, and with a bit of shadow/highlight enhancement:
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AndyG
post Mar 3 2010, 10:23 PM
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QUOTE (volcanopele @ Mar 3 2010, 10:19 PM) *
...we were pointed where we planned it, but Helene was not where we expected it to be.


When was Newton taken off the wheel? rolleyes.gif

(Just kidding)

Andy
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volcanopele
post Mar 3 2010, 10:39 PM
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QUOTE (jasedm @ Mar 3 2010, 03:21 PM) *
One of the better global raws, rotated so the large crater is at the top, and with a bit of shadow/highlight enhancement:

North is to the lower right in your image there.


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jasedm
post Mar 3 2010, 10:45 PM
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Ah yes, you're right, I overlooked the rim of that (relatively) huge crater.
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ngunn
post Mar 3 2010, 10:52 PM
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QUOTE (AndyG @ Mar 3 2010, 10:23 PM) *
When was Newton taken off the wheel?


He was no good. As soon as there were more than two bodies his calculations went to pieces.
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NickF
post Mar 3 2010, 10:54 PM
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QUOTE (volcanopele @ Mar 3 2010, 10:19 PM) *
Well, the issue might have been not so much the pointing, but our understanding of the position of Helene... mean, we were pointed where we planned it, but Helene was not where we expected it to be.


Better this way than Cassini ending up as bugsplat on Helene's windshield laugh.gif


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machi
post Mar 4 2010, 10:57 AM
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Darkside of Helene.
Combination from five raw images.
Approximately 2× magnified.
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stevesliva
post Mar 4 2010, 05:25 PM
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Nice machi! You brought out some gullies/streaks in the lower left there.

They all remind me of that closeup of the crater in Stickney on Phobos.
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Frank Crary
post Mar 4 2010, 07:52 PM
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QUOTE (ngunn @ Mar 3 2010, 10:52 PM) *
QUOTE (AndyG @ Mar 3 2010, 10:23 PM) *
When was Newton taken off the wheel?

He was no good. As soon as there were more than two bodies his calculations went to pieces.


Actually, that's another reason the Helene images very interesting. Helene is a trojan moon of Dione. It turns out the three-body interaction makes Helene's orbit a sensitive measure of the Dione:Saturn mass ratio. I suspect someone can turn an off-center image of Helene into an improved determination of Dione's mass.
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ngunn
post Mar 4 2010, 09:59 PM
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Welcome to UMSF Frank.
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Ian R
post Mar 5 2010, 01:53 AM
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In this montage, the two views to the right are wide-angle shots of Helene which I presume were taken during the unsuccessful skeet-shoot sequence, while the left-most view is a NAC frame taken as Cassini was receding from the moon with Saturn providing a backdrop:

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machi
post Mar 7 2010, 03:58 PM
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Nice montage Ian R!

I send another two views of Helene.
First image is higher resolution combination of the darkside (from 4 images).
Second is highest resolution image of Helene (global image is WAC frame). Resolution of this image is aproximately 20 meters per pixel (my rough estimate).
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machi
post Mar 7 2010, 04:28 PM
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And third image.
It's a combination from 13 images.
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alan
post Mar 7 2010, 04:51 PM
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Lots of linear features on the crater rim, the results of landslides I assume. If a landslide was occurring while you were observing Helene, at ~0.001g, could you tell it was happening?
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