[cassini] Dione pictures

Evil Dr Ganymede · Post #21by **Evil Dr Ganymede** » 27.12.2004, 18:48

no, looks more like a fault line or a crater chain to me. Here's a crater chain on Ganymede (Enki Catena):
http://neo.jpl.nasa.gov/images/ganymede.html

And here's one on Callisto (Gipul Catena):
http://www.star.ucl.ac.uk/~idh/solar/ca ... llist3.htm

I dunno the scale of the Dione image though, if they are craters then they're probably much smaller than the ones on the Galileans. Or it's a tectonic fault (which can also be rather straight).

Matt McIrvin · Post #22by **Matt McIrvin** » 28.12.2004, 16:35

There's a huge argument about this going on over on the Bad Astronomy board; lots of people seem to think it can't be a tectonic fault because it's perpendicular to all the giant cliffs. But that sort of thing happens on Earth as well, doesn't it? At least, I have dim recollections of National Geographic maps of the ocean floor that have straight faults running perpendicular to the great ridges at the mid-ocean spreading zones. It's a completely different set of tectonic phenomena, of course...

danielj · Post #23by **danielj** » 28.12.2004, 16:40

Talking about this,why the catenas in Celestia are poorly seen.For example,the script zoom in to see the catena,but it is very subtle,it is almost invisible.This occurs evenm with the 8k versions of Ganymede and Callisto,for example

Evil Dr Ganymede wrote:no, looks more like a fault line or a crater chain to me. Here's a crater chain on Ganymede (Enki Catena):
http://neo.jpl.nasa.gov/images/ganymede.html

And here's one on Callisto (Gipul Catena):
http://www.star.ucl.ac.uk/~idh/solar/ca ... llist3.htm

I dunno the scale of the Dione image though, if they are craters then they're probably much smaller than the ones on the Galileans. Or it's a tectonic fault (which can also be rather straight).

Matt McIrvin · Post #24by **Matt McIrvin** » 28.12.2004, 20:25

hank wrote:From CARTOGRAPHY OF THE ICY SATURNIAN SATELLITES:
...

This very interesting report includes a map showing the coverage of Dione at various resolutions expected to be obtained by Cassini in 2004-7.

Thanks! That paper is fascinating. And now I'm thinking that the caption on that JPL map was completely wrong, and it was really based on Voyager pictures alone.