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T58 (July 8, 2009 / Rev 114)
stevesliva
post Aug 5 2010, 07:11 AM
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Sweet! Nice deltas, and a neat volcanic-looking craterthing to the right of the lake.
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peter59
post Aug 5 2010, 08:02 AM
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T58 RADAR swath with Ontario Lacus and the surrounding area in higher resolution.
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sariondil
post Aug 6 2010, 08:59 AM
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Ontario Lacus @ 128 pixel per degree, or about 350 m/pix. Constructed from T57 and T58 SAR plus PIA13172 (a piece of T65 SAR).
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alan
post Aug 7 2010, 04:55 PM
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Interesting raised area with crater. Cryovolcanism? Pedestal crater?
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volcanopele
post Aug 7 2010, 05:46 PM
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Illumination is from below. So that is actually a depression, not a raised area. This feature is most likely a dried lakebed.


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JohnVV
post Aug 8 2010, 03:36 AM
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optical illusions ,fun,fun,fun
the ones i "see" all the time are the raised impact craters
blinking an inverted tone image helps
2 frame gif
[attachment=22243:1.gif]

ps that line better be a radar artifact
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Juramike
post Aug 9 2010, 01:58 PM
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QUOTE (volcanopele @ Aug 7 2010, 12:46 PM) *
This feature is most likely a dried lakebed.


...with steep sides around the edges. However, that central darker spot in the largest bright area *might* be a slight depression infilled with different RADAR-reflecting properties. Damp muds, for example.




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ugordan
post Oct 2 2010, 04:44 PM
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A four-frame VIMS animation showing the evolution of the lake specular point:
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Magnified 5x using nearest neighbor interpolation to show the actual specular point pixel size. It's only visible at 5 microns, the green (4.67 microns) and blue (3.26 microns) channels aren't in methane windows, they were chosen merely so they wouldn't be overexposed in the longer exposure cubes.


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scalbers
post Oct 2 2010, 06:30 PM
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Nice animation Gordan. Would the evolution of the glint depicted here tell us mostly about the lake extent, or also about expansion of the glint by wave action (or lack thereof)?


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ugordan
post Oct 2 2010, 07:16 PM
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Pretty much lake extent only AIUI. The latest understanding appears to be that the lakes are very flat i.e. not much wind-driven wave action.


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dilo
post Oct 2 2010, 07:32 PM
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Thanks for the movie, ugordan. This is an elaboration ot third frame, compared to original...

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Jason W Barnes
post Oct 9 2010, 03:10 AM
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QUOTE (scalbers @ Oct 2 2010, 11:30 AM) *
Nice animation Gordan. Would the evolution of the glint depicted here tell us mostly about the lake extent, or also about expansion of the glint by wave action (or lack thereof)?


The size is only telling you about the point-spread-function of the VIMS instrument, as it turns out -- not lake extent. The time evolution is telling you about the waves and whether the specular point is on land or liquid. My paper on this was just accepted, and I will post a version here as soon as it's up on the _Icarus_ website.

What the heck, here it is. It will be up on _Icarus_ in press soon.

- Jason
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volcanopele
post Oct 9 2010, 04:23 AM
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QUOTE (Jason W Barnes @ Oct 8 2010, 08:10 PM) *
What the heck, here it is. It will be up on _Icarus_ in press soon.

It is in press now, as of yesterday.


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Jason W Barnes
post Oct 9 2010, 04:40 AM
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QUOTE (volcanopele @ Oct 8 2010, 09:23 PM) *
It is in press now, as of yesterday.


I'm behind the times, evidently. Thanks ISS Jason!

- VIMS Jason
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ugordan
post Oct 9 2010, 09:39 AM
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Thanks for the paper, VIMS Jason. So, there's 14 speculars on T59 as well?

Must...animate...those...


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