Printable Version of Topic

Posted by: remcook Jun 29 2007, 08:54 AM

Images are up

also saw some Mimas images in which it looks like pacman

Posted by: CAP-Team Jun 29 2007, 09:50 AM

The images look a bit underexposed to me..
The Mimas images nicely fill a gap in the Mimas map!

Posted by: angel1801 Jun 29 2007, 10:25 AM

I have used the solar system simulator to see that the images of Mimas cover the longitudes 120W to 0W and from 0W to 300W, which have not been well imaged so far.

Posted by: ugordan Jun 29 2007, 10:40 AM

I'd say the raw histogram stretcher is acting up instead. The Mimas images show a very subtle band similar to the one found on Tethys' leading hemisphere.

Posted by: DEChengst Jun 29 2007, 04:54 PM

Just two quick stitches:

http://paranoid.dechengst.nl/saturn/Tethys-05%20frames-27-JUN-2007.jpg

http://paranoid.dechengst.nl/saturn/Tethys-11%20frames-27-JUN-2007.jpg

Posted by: alan Jun 29 2007, 05:28 PM

Are you seeing two dark dark bands or one bright band?

Posted by: ugordan Jun 29 2007, 06:41 PM

I'm seeing a slightly brighter band (better visible in UV filters) that seems to end at the right hand side limb. It's probably just a slight albedo variation similar to the one seen to the west of Herschel - see http://farm1.static.flickr.com/83/229244227_a76aab0d6e_o.jpg for an extreme enhancement of that west side (it appears bluish).

Posted by: Eric Hartwell Jun 29 2007, 08:31 PM

A most impressive crack on Tethys (contrast adjusted and cropped, rotated so sun is at upper left). Also at http://www.flickr.com/photos/ehartwell/663279037/

N00085211 - http://saturn.jpl.nasa.gov/multimedia/images/raw/raw-images-details.cfm?feiImageID=114769

Posted by: elakdawalla Jun 29 2007, 08:35 PM

That one caught my eye too. It's mysterious to me how it could have formed. It's like someone dragged a stick across Tethys.

And welcome to UMSF, Eric!

--Emily

Posted by: Exploitcorporations Jun 29 2007, 09:43 PM

I need a bucket and a mop for all these gallons of drool. Traveling this month, so sadly unable to be all over these marvelous images like flies on...yeah. All those bitty fractures and ice that really looks like ice at high phase angles. Everything north of the scene in the 9 March 2005 view of the Ithaca Chasma should really smooth out the map of this hemisphere...I wonder if the camera team planned it this way all along (never understood why they didn't take in the whole canyon back then when they had the opportunity). Telemachus looks incredible at this resolution too. Thanks for the stitches DEChengst, and second the warm welcome to Eric!

Posted by: djellison Jun 29 2007, 09:51 PM

Sweet stuff

Posted by: Bjorn Jonsson Jun 29 2007, 10:59 PM

That crack is weird. My first (and crazy) idea was if this could be a 'continuous crater chain' because there are some crater-like features along it. Anyway, lots of interesting images and Telemachus looks awesome at this resolution.

Posted by: Bjorn Jonsson Jun 30 2007, 12:01 AM

I usually don't like replying to myself but I just noticed that some nice images of Enceladus have appeared on the raw images page.

And WOW:
http://saturn.jpl.nasa.gov/multimedia/images/raw/raw-images-details.cfm?feiImageID=114825

Posted by: AlexBlackwell Jun 30 2007, 12:04 AM

Nicely spotted. Yes, that is a "WOW" image.

Posted by: elakdawalla Jun 30 2007, 12:37 AM

Whoa. Awesome! But why oh why did they take the green image so much later than the red and blue?

That one was apparently taken at 12:52 UT:

And that's Pandora lurking between Enceladus and Mimas.


I love the Saturn system.

--Emily

Posted by: ugordan Jun 30 2007, 11:17 AM

There's a blue image? I'm not seeing it
The filter combo is unusual, perhaps there are more frames that haven't been downlinked yet? This is just begging to be a Kodak moment.

Posted by: Bill Harris Jun 30 2007, 12:12 PM

Impressive but not unusual. I noticed many of these cracks on dechengst's two stitches. Their orientation does not appear to be related to the nearby grooved terrain. Odd world.

--Bill

Posted by: hendric Jun 30 2007, 04:47 PM

What I found interesting in DEChengst's stiches were the long arcing rilles, one in the middle of the first picture, one up and right from the crack noted earlier. To me, they resemble the cycloid cracks that we see on Europa.

Posted by: elakdawalla Jun 30 2007, 05:06 PM

Sorry. I saw the Green and the Red and assumed that the last of the three was a Blue, but it's an IR3. I sure hope there are more coming down! Yes, that's an odd combo of filters, so it seems very likely that more were taken, but I guess we'll just have to wait to be sure.

--Emily

Posted by: elakdawalla Jul 2 2007, 06:50 PM

I've heard through the grapevine that there's some glitch getting these images posted on the raw images page, and that there are in fact RED/GRN/BL1 available. Hopefully we'll see them later today or tomorrow. Keep your eyes peeled!

--Emily

Posted by: JRehling Jul 2 2007, 09:45 PM

My thought is that there are faults under the surface and they're just wide/narrow enough that the surface has collapsed in places, but not others. Check out this lava tube-derived feature that looks very similar on Ascraeus Mons on Mars:

http://marsprogram.jpl.nasa.gov/mgs/msss/camera/images/5_15_98_ascraeus_release/26705r.gif

Posted by: ugordan Jul 3 2007, 12:19 PM

While we're waiting for the complete raw sequence to be posted, here's something I don't normally do - a colorization.

The original image (N00085255) was lossy compressed so it's pretty blocky, I tried to remove blockiness while not killing all detail in the process.

Posted by: tedstryk Jul 3 2007, 01:30 PM

Looks great! One thing that helps with this set is that with the previous coverage of Enceladus and Saturn, as well as the filters we do have, it isn't too much of a stretch to guess how it would look with a blue image added.

Posted by: ugordan Jul 3 2007, 03:45 PM

Thanks. I actually did use an old composite of mine as color source for limb colors. The viewing geometry was pretty similar so I assumed they're a good match.

Posted by: scalbers Jul 3 2007, 07:18 PM

Good call CAP-Team. I have a map version now with a new image added.

http://laps.noaa.gov/albers/sos/sos.html#MIMAS

Posted by: Floyd Jul 3 2007, 11:05 PM

Scalbers, this may be a crazy idea, but here it is anyway. Different parts of the image have illumination from opposite angles--which makes viewing difficult--the mind puts mounds next to craters. What if you inverted some parts of the image so the illumination always seems to come from the top or right. Would anything get seriously messed up by mixing positive and negative images?

Posted by: Phil Stooke Jul 4 2007, 12:26 AM

I've done some of that - check out my Eros mosaic and see if you can spot the (very small) inverted section. But it's very hard to do successfully, especially messed up if there are any shadows, and of course albedo variations as well.

Phil

Posted by: scalbers Jul 4 2007, 01:37 PM

Well said Phil. I'm unable to find the inverted region in your Eros map, that's a good sign.

Many of the Mimas images have low sun angles so with all the cratering this seems to be more of an issue compared with the other satellites. One quick fix might be to scale back portions of the new image near the terminator, at least that would restore the rim of Herschel to make it whole again.

There may be a way to do the suggested inversion (using the new image) within the framework of my software - so I'll see if I get some time to try that out.

Posted by: um3k Jul 4 2007, 04:49 PM

Well heck, let's just fix it the old-fashioned way--anyone here good with an airbrush?

Posted by: Exploitcorporations Jul 11 2007, 07:50 AM

A few more mosiacs from 47:

Posted by: Exploitcorporations Jul 11 2007, 07:57 AM

The global view looking back. Just a suggestion for Steve...the press version of this if released might really level out the shading variations on your map on this hemisphere.

Posted by: scalbers Jul 11 2007, 07:01 PM

Glad to see EC's back with some interesting new mosaics. I've started with 3 of the individual raw images and I can see they may help with showing Ithaca Chasma better. There's always the tradeoff of good consistent lighting relative to resolution with the various images. EC's mosaic suggests there are more images that can be added to the 3 that I've tried. I suppose I can try either the individual images or a mosaic depending on availability.

Posted by: Littlebit Jul 11 2007, 09:13 PM

This is an inny with an outty in the middle that just looks like an outty with an inny in the middle?

Posted by: scalbers Jan 29 2008, 08:22 PM

Time to resurrect this thread as I've started to add some of the Rev 47 imagery to my map. I think I figured out which 4 images to use that represents what was shown in EC's global mosaic. So here's a first cut at adding them in, hopefully showing Ithaca Chasma and environs better.

The full size 4K version is at http://laps.noaa.gov/albers/sos/sos.html#TETHYS

Steve