Dione Image Products Options

[jasedm]

Very noticeable that the feature previously known as Cassandra (~245deg West 42 deg South) doesn't show up too well on the new map. It was exceptionally prominent in distant Voyager images because of the albedo differential (and was assumed to be a ray crater)
The name Cassandra has now been used for a nearby crater by the IAU as the 'rays' with Cassini's better vision appear to be a series of tectonic features radiating from a central source.

Great to be party to the mapping of new worlds

[tedstryk]

This is some very interesting work. The first, third, and fifth pages are the most interesting:

http://www.dlr.de/en/desktopdefault.aspx/t...ry-1/51_read-1/
http://www.dlr.de/en/desktopdefault.aspx/t...ry-1/51_read-2/
http://www.dlr.de/en/desktopdefault.aspx/t...ry-1/51_read-3/
http://www.dlr.de/en/desktopdefault.aspx/t...ry-1/51_read-4/
http://www.dlr.de/en/desktopdefault.aspx/t...ry-1/51_read-5/

[ugordan]

I've recently been playing around with the September 30th 2007 flyby PDS data. Here's the inbound 2-frame mosaic, IR1/GRN/UV3 stretched, low-res color overlaid on full frame clear images:



Here's one of the highest resolution footprints in enhanced (boosted saturation and UV channel) IR1/GRN/UV3 color, taken from 47 000 km:


Notice the small, yellowish craters. There's material for a high resolution color mosaic, but there might be several data dropouts. I didn't even attempt it due to substantial viewing geometry change. I did do the outbound global mosaic, 7 NAC frames also in IR1/GRN/UV3 color, about 90 000 km distance:




Lastly, here's a quick-n-dirty enhancement of the splat subtly visible in even more distant imagery:

[jasedm]

Fabulous work! - I particularly like the crescent view.

[tedstryk]

Lastly, here's a quick-n-dirty enhancement of the splat subtly visible in even more distant imagery:

Wow, that crater left quite a splat! Great work, Ugordan!

[ugordan]

Here's the raw image merge from this post using calibrated data for comparison:

[tedstryk]

By "raw" do you mean true raw images or the "raw" jpegs?

[dvandorn]

Wow, that crater left quite a splat! Great work, Ugordan!

Seconded! That splat is quite remarkable. Makes you wonder whether a darker, redder body impacted Dione, or an impactor exhumed a darker, redder layer out from under the bland icy crust.

Doesn't look like a deeper or fresher crater than others which left no splat, so I'm leaning towards the former.

-the other Doug

[Phil Stooke]

No, that's not the real color.

Phil

[ugordan]

By "raw" do you mean true raw images or the "raw" jpegs?

I was referring to the raw (as in JPEG) merge from that post, only done with PDS data this time.

[ugordan]

Makes you wonder whether a darker, redder body impacted Dione, or an impactor exhumed a darker, redder layer out from under the bland icy crust.

Phil is right, that's not the actual color, it's an enhancement to show the outlines of the splat. The ejecta blanket is subtly yellowish in stretched colors - similar to the high res shot showing a small crater inside. In natural color it's effectively unnoticeable.

[Decepticon]

Amazing work.

[scalbers]

Anything coming up for the non-targeted flyby on July 11? Looks about 87000km distance on dmuller's Cassini timeline.

[jasedm]

Hi Steve,
Having checked out the Ciclops 'looking ahead' article for the next revolution, it appears there are no plans to image Dione on this pass. A shame, as I think some N. polar territory which has been poorly imaged hitherto would have been in view at Voyager-class distances (see SSS simulation below).

Obviously equinox studies are rightly taking precedence for the next month or so at or around periapse.

Dione will have a handful of very good passes in the XXM (if approved) so that's yet another thing to look forward to on this mission.

Jase

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[jasedm]

I spoke too soon, and reckoned without the ingenuity of the image-sequencing people....
They nabbed an opnav-range image of Dione which reveals some more detail in the N. polar region.

Range 427,997 taken on 11th July, slightly enhanced and cropped and rotated to match the solar system simulator view alongside.

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