Dione Image Products Options

[belleraphon1]

All.... trying to do this from work and keep forgetting things I meant to add in the first note I posted...

Here is the presentation I was talking about ............

http://saturn.jpl.nasa.gov/multimedia/prod...ARM_Krishan.pdf

Dione ....... a scent of water/nitrogen perfume still wafting the Saturnian system????

[Bart]

Yeah, I pointed this out here http://www.unmannedspaceflight.com/index.p...ost&p=55911

I thought it was pretty cool too, but the response seemed to be deafening silence.

Bart

[tedstryk]

Fantastic work. Might I suggest changing your name to Exploitphotomosaics ?

[edstrick]

I did read that, but didn't get back to the thread...

"Curiouser and Curiouser, said Alice"

Dione has higher density than most of the small moons, doesn't it?.. more isotope heat..

It's the only moon other than the hot enchilada with relatively pristine fracture patterns.

It has flat areas largely lacking large impacts and they seem relatively textureless other than smaller impact crater populations... as though they'd been resurfaced.

Isn't Dione the sat in a resonance with Enceladas?

It'd be the only other candidate in the system for any internal heating driven outgassing, "fer sure". Tethys had activity and resurfacing but looks pretty thoroughally dead now.

[angel1801]

Just a heads-up for the rev after next...it looks as though Cassini will have an outstanding moderate-resolution view of pretty much the whole fracture system, as well as additional gap fill coverage to the north. This view of Dione on 24 July 2006 from Celestia's reference trajectory is from a distance of 260,000km, the field of view narrowed by a factor of two for visibility.

[attachment=5904:attachment]

The Dione images were successfully taken and transmitted to earth and the 11 images are available as raw images. Also there are some good images of Rhea's south pole area in a crescent position from about 170,000 km out too.

[MarcF]

After watching these pictures I'm still wondering about the reality of the Amata basin.
These pictures as well as most of the pictures of the same region taken with a lower resolution (Voyager 1 included) seem to show that it indeed exists. However, the high resolution pictures (which were all taken at low sun angle) do not show any trace of the basin. After the close flybys I was convinced about its non-existence, but now, I again have a doubt. So could it be a kind of palimpsest indicating a very old basin almost erased by the younger overlying tectonic patterns or is it just an optic illusion due to fortuitous placing of tectonic, impact and albedo features ?

[dilo]

I made this pseudo color (MT2+CL+UV filters) of last Dione view and only now I noticed the stright, narrow, bright features in the right/bottom region. Some of them clearly originate from a common point (impact?)...
Can someone explain these "channels"?
(normal version)
(enhanced version)

[Michael Capobian...]

They were originally thought to be crater rays and named Cassandra. Current theory says that they're a system of radial fractures and scarps.

Michael

[dilo]

Thanks Michael; this is amazing and recall me Europa, even if here channels aren't curved...

[Ian R]

Dilo,

Here's a couple of earlier Cassini pictures of Dione that show Cassandra to good effect:

http://saturn.jpl.nasa.gov/multimedia/imag...3/N00037561.jpg

http://saturn.jpl.nasa.gov/multimedia/imag...1/N00035168.jpg

And here's a PDF discussing the origin of the feature:

http://www.planetary.brown.edu/m42/m42_68.pdf

Cheers,

Ian.

[dilo]

Wow, this "wispy material" could be a surficial deposit associated with (cryo)volcanic exhalations along cracks!
Thanks, Ian.

[dvandorn]

Yeah, when you look at the lines in detail, it appears that there may have been upwelling along the thicker portions.

These do look more like cracks than rays, don't they? They are emplaced radially, and would seem to have been caused by some type of impact at the center of the radia. You'd think the surface would only do that if it were a fairly thin layer of ice floating on a liquid ocean, wouldn't you?

-the other Doug

[Phil Stooke]

I might have looked instead at diapir effects - let's say Cassandra marks a diapir that stalled, just producing a few radial cracks, while the main fracture system was produced by a major diapir-induced uplift, lots of basically radial fractures in broad lanes, plus a bit of central subsidence as the process ended, producing Amata. I think an impact would be more obvious.

Phil

[MarcF]

Is there any chance that Dione is still active ? I would not be so surprised.
I heard about rumors of plumes. Does anyone know more about that ?
Dione is for me the third most interesting moon of Saturn (after Titan and Enceladus of course), far more interesting than the curious but likely old and frozen Iapetus. The tectonic features appear to be really "fresh" (as it seems to be also the case for the giant basin near the south pole).

[belleraphon1]

Any one look at the current CASSINI RAWS.....

probably just my bad eye eight (or blurry glasses), but I think I see a hint of diffuse activity along Dione's
crescent in this image.........

http://saturn.jpl.nasa.gov/multimedia/imag...eiImageID=80462

Again..... see my earlier post to this thread regarding the CHARM presentation. Mass loading at Dione
was detected and the team suggests looking for plume activity...... wonder if this set of images is an attempt to do just that?????

Craig