[X] My Assistant

[SigurRosFan]

http://photojournal.jpl.nasa.gov/catalog/PIA07732

Informatively image release.

[edstrick]

Ooo.. Perfect time for a new thread... I was looking for a topic to attache the following to....

I ran my nifty-keano bandpass filtering enhancement on the mosaic today and got the attached results.

That previously discussed dark plume-like feature is still there. I will be most interested to know if it's changed in any way since the discovery images last winter or spring. The dark spot that seems to be it's source is featureless and lacks sharp edges at this resolution and signal-to-noise-ratio. The less well defined dark plume'ish feature at the top of the image also needs comparison with previous imagery. I will be even-more-than-most-interested to see of VIMS shows any spectral difference between these features and the normal dark materials seen at low lattitudes.

Also of interest, almost due south of the dark "plume" on the light-dark region boundary is about 2/3 of an almost perfect circle with a very slightly bright rim (I don't think artifact of the enhancement). The north edge and a bigger chunk of the south edge are disrupted by mostly light material. A smaller near perfect circle with some attached light "blobs" is visible to it's left, mostly surrounded by dark materials. Calderas? Eruptive Centers?... Impact Craters?.. They're quite different from the crater on the right side of the mosaic.

There really do seem to be low contrast streamers of lighter and darker albedo markings in the dark regions of the "H", but they're really at the S/N limits of the image.

Attached thumbnail(s)