A little belatedly (to post here- the article's been up for a week or two), looking ahead for this revolution (now half complete) here
WAC enceladus from 185km - great detail!
Some shots of tethys too - some are very smeared - spacecraft slewing during shuttering perhaps??
Also some enceladan plumes
Great stuff!
Full Version: Rev 164: Apr 5-23, 2012 - Enceladus E18, Tethys
Unmanned Spaceflight.com > Outer Solar System > Saturn > Cassini Huygens > Cassini's ongoing mission and raw images
Worth posting that Enceladus image here. Image rotated and enhanced a little (wow!):
QUOTE (jasedm @ Apr 16 2012, 06:31 AM) 
Some shots of tethys too - some are very smeared - spacecraft slewing during shuttering perhaps??
Apparently all of the smeared images are UV2 images. UV2 requires a far longer exposure time than most filters. Still seems like a lot of smear though.
The WAC image taken from the same distance is a narrow crescent - so these images must be of the Saturn-lit side, hence the long exposure.
Phil
Phil
Thanks Bjorn - that would make sense re: the smearing.
Just in case anybody is not already blown away by the accuracy of the spacecraft sequences on this mission, below is that WAC shot compared to Jason Perry's 'looking ahead' simulated view (the red square). Accurate to within a few tens of metres! All from a spacecraft 1.3 billion kilometres away, travelling past the target at 7.5km/second. Sweet.
Incidentally the yellow square is the boresight for the narrow angle camera, and although a shot was taken (N00185750), unfortunately it fell completely in the shadows in the middle of the larger shot, and is almost completely black. I'm not sure it would have been too useful anyway though...
Just in case anybody is not already blown away by the accuracy of the spacecraft sequences on this mission, below is that WAC shot compared to Jason Perry's 'looking ahead' simulated view (the red square). Accurate to within a few tens of metres! All from a spacecraft 1.3 billion kilometres away, travelling past the target at 7.5km/second. Sweet.
Incidentally the yellow square is the boresight for the narrow angle camera, and although a shot was taken (N00185750), unfortunately it fell completely in the shadows in the middle of the larger shot, and is almost completely black. I'm not sure it would have been too useful anyway though...
... except that the shadows are not black, as my image above shows, so if it's not too smeared there should be plenty of detail in it.
Phil
Phil
The nac isn't completely black. You can make out stuff in the shadowed regions, and there are a few streaks from points that reach into the sunlight. Unfortunately, it is quite smeared and the low exposure time (5 ms) isn't the best for making out details in the shadows.
QUOTE (Phil Stooke @ Apr 16 2012, 05:13 PM)
... except that the shadows are not black, as my image above shows, so if it's not too smeared there should be plenty of detail in it.
Phil
Phil
Fair enough Phil, hope some detail can be teased out.
Incidentally, I expect to be widely lambasted here
, but could this be a hint of vented gases (see box below). Illumination is from the 'top' so one would expect that side of the canyon to be uniformly dark.
This is simple gif, which gives basic clue, what can be seen in raw file N00185750 and its "raw" jpg image reduced to 1/5 size.
I think that calibrated raw version will be useful, because it'll bring some more informations about terrain in this place, than WAC image (despite smearing).
I think that calibrated raw version will be useful, because it'll bring some more informations about terrain in this place, than WAC image (despite smearing).
Nice! Yes, more detail from the raw data, of course, when we get it.
Phil
Phil
Wow, what's the resolution of that NAC image?
Anyone notice the multiple linear, parallel grooves on Tethys? Has this been thought about in the context of this body?
Anyone notice the multiple linear, parallel grooves on Tethys? Has this been thought about in the context of this body?
If distance to the terrain in those images is really 185 km, then ~11 m/pix for WAC image and ~1.1 m/pix for NAC image. So theoretically smallest visible details could be only 2.2 meters wide, but realistically, after some processing and for raw file, my guess is, that details (with high contrast) with size about 6 to 12 meters could be recognizable (some boulders, I presume).
Which is not bad result, maybe it's even record for Enceladus. If my memory is right, then best image to date had resolution ~4 m/pix (and this image was smeared too, but not so badly), so details around 8 to 10 meters were recognizable.
Which is not bad result, maybe it's even record for Enceladus. If my memory is right, then best image to date had resolution ~4 m/pix (and this image was smeared too, but not so badly), so details around 8 to 10 meters were recognizable.
Hey, Hungry - wow, first time I've noticed those grooves. I wonder how far they extend.
Phil
Phil
This color shot of Odysseus is composed from Clear and UV frames, and a synthetic Red:
Click to view attachment
Click to view attachment
Fantastic work guys, that shot of Odysseus is a real cracker! 
Interesting. Not all of them are perfectly parallel.
Tethys gets more and more interesting - below, a crop from N00185759, showing interesting lobate flows? either side of one crater (on the left of the image) and slippage within another crater:
The internal fractures on the floor of Odysseus are fascinating, I'd always thought this was a boring icy moon...
P
P
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