Dione Image Products |
Dione Image Products |
Oct 15 2005, 10:19 AM
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#16
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SewingMachine Group: Members Posts: 316 Joined: 27-September 05 From: Seattle Member No.: 510 |
-------------------- ...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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Jul 28 2006, 10:27 PM
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#17
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Member Group: Members Posts: 813 Joined: 29-December 05 From: NE Oh, USA Member No.: 627 |
Thanks for the comments MarcF, ugordon, and dilo....
Have to "kinda" agree. Wondered if the other image was taken at a slightly different exposure setting. The CHARM presentation says the mass loading at Dione is an order of magnitude below what is seen at Enceladus. So I picture that as, perhaps, diffuse shedding of internal gassy molecules. It may not show up as a distinct plume. It may be distributed along the fracture systems...... What was the geometry of the Dione 16 encounter? What longitudes did that cover at closest approach? Craig |
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Aug 3 2006, 09:13 AM
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#18
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Another couple of false color elaborations based on a sequence of increasing exposures, clear filter images:
First one associate an RGB channel to each image while in the second one I tried to highlight dimmest details. To highlight the small difference between position angle of subsolar point and the faint glow, which seems slightly rotated toward left (the difference is about 20 deg, measured from Dione center). Again, not enough to say if there is a weak plume or an artifact but seems interesting... -------------------- I always think before posting! - Marco -
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Aug 3 2006, 03:07 PM
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#19
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
Another couple of false color elaborations based on a sequence of increasing exposures, clear filter images: First one associate an RGB channel to each image while in the second one I tried to highlight dimmest details. To highlight the small difference between position angle of subsolar point and the faint glow, which seems slightly rotated toward left (the difference is about 20 deg, measured from Dione center). Again, not enough to say if there is a weak plume or an artifact but seems interesting... Just as a skeptical hypothesis, I wonder if this cometlike halo could be due to the summation of light coming from Dione plus some generalized light leak placed to the right. |
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Aug 21 2006, 11:16 AM
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#20
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Just as a skeptical hypothesis, I wonder if this cometlike halo could be due to the summation of light coming from Dione plus some generalized light leak placed to the right. That's probably about right. All Cassini images exhibit an ever-so-slight halo around bright objects. I don't know if it's an inherent "feature" of the narrow angle camera or residual haze traces or simply diffraction/PSF effects. Probably a bit of everything. In any case, if the Dionian hypothetical plumes are real and much weaker than Enceladean (as it's been suggested), about the only way to see them would be to occult the Sun so there's no illuminated crescent visible. No saturnshine would be a bonus, too. Even then, it's a question of the plumes themselves being in sunlight. That's a lot of geometry constraints. AFAIK, this is not going to happen since Cassini already executed its dedicated Dione flyby and is left with only a couple of distant flybys in the primary mission. The chance of the geometry being such that Dione will occult the sun is miniscule. We're likely stuck with only hints of activity from the magnetometer readings. -------------------- |
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Nov 23 2006, 03:20 AM
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#21
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
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