Enceladus, the Europa of Saturn

chew_on_this · Mar 9, 2005

And finally a nice full view shot:

jmilsom · Mar 10, 2005

Hey vogon13, you refer to your earlier thread and say you found images. I am a little confused - are the last four posts from yourself and chew_on_this from the Enceladus-1 flyby or the Enceladus-2 flyby conducted yesterday. It is not clear to me from the website. <div class="Discussion_UserSignature"> </div>

vogon13 · Mar 10, 2005

The possibly 'uphill' running veiny thing picture was taken during the first good Cassini flyby. Don't know how to tell if second flyby photographed area again. If I had any computer skills, would snag picture from JPL Cassini website and crop it, enlarge it and post it here. (hint, hint). Image number is N00028183.jpg. Am going to attempt to 'link' to picture. Will probably crash the Internet in the attempt, but feel compelled to try. <div class="Discussion_UserSignature"> TPTB went to Dallas and all I got was Plucked !!So many people, so few recipes !!Let's clean up this stinkhole !! </div>

vogon13 · Mar 10, 2005

Ok, here goes http://saturn.jpl.nasa.gov/multimedia/images/raw/raw-images-details.cfm?feiImageID=32297 This will either not work in a benign fashion, erase everyones hard drive, send everyone to a lesbian midget nun goat wrestling porn site or work. My apologies in advance if I wind up destroying western civilization. <img src="/images/icons/laugh.gif" /> <div class="Discussion_UserSignature"> TPTB went to Dallas and all I got was Plucked !!So many people, so few recipes !!Let's clean up this stinkhole !! </div>

vogon13 · Mar 10, 2005

Bojemoi!!!! Worked on my computer! I pull up picture in full resolution, enlarge all the way, and move into lower right hand corner to see weird veiny things. <div class="Discussion_UserSignature"> TPTB went to Dallas and all I got was Plucked !!So many people, so few recipes !!Let's clean up this stinkhole !! </div>

yurkin · Mar 10, 2005

That’s an amazing picture. There’s a lot of weird stuff going on in it.

jmilsom · Mar 11, 2005

No worries with the link. Yeah a great picture. I guess those posted by chew_on_this are from the Enceladus-2 flyby. I thought the second flyby was to be the closest so was expecting some really amazing images. <div class="Discussion_UserSignature"> </div>

chew_on_this · Mar 11, 2005

there are more on: http://saturn.jpl.nasa.gov/home/index.cfm

astrophoto · Mar 11, 2005

There appear to be giant caves and/or holes in a few of the veins, expecially the thick one in the lower-right portion of the picture. Are those veins hollow??

jmilsom · Mar 11, 2005

Thanks! Excellent - all the raw images of the Mar 9 flyby are there. <img src="/images/icons/smile.gif" /> <div class="Discussion_UserSignature"> </div>

jmilsom · Mar 11, 2005

I'll take the liberty of extending retro555's link on the Missions and Launches forum to this thread. An absolutely excellent summary of all the Enceladus images and work so far. http://www.planetarysociety.org/news/2005/cassini_enceladus_0311.html <div class="Discussion_UserSignature"> </div>

vogon13 · Mar 11, 2005

That was the freaky part!! They look like lava tubes (I guess, I live in Iowa and have never seen one here) but one of them runs uphill. How can it be???? It's the weirdest thing. <div class="Discussion_UserSignature"> TPTB went to Dallas and all I got was Plucked !!So many people, so few recipes !!Let's clean up this stinkhole !! </div>

tom_hobbes · Mar 12, 2005

Yes, they are strange. This is the image I was refering to toward the top of the thread. I'd still like to hear some theories. If they are something like lava tubes they're pretty huge and they do seem to run across each other. http://www.planetarysociety.org/saturn/images/enceladus_cassini_050217_dist0010-8_cl_1024x1024.jpg <div class="Discussion_UserSignature"> I wish I could remember But my selective memory Won't let me - Mark Oliver Everett </div>

robnissen · Mar 12, 2005

Thx for the tremendous link. I especially liked how they put both passes in west to east order.

chew_on_this · Mar 16, 2005

More processed images at: http://ciclops.lpl.arizona.edu/view_event.php?id=17

chew_on_this · Mar 16, 2005

http://space.com/scienceastronomy/enceladus_atmosphere_050316.html Hmmm....atmosphere, geysers, cryovolcanism. Sounds like the sub-surface ocean is coming to light. I wonder if an atmosphere could also be present at Europa? Does anyone know if Galileo was close enough (or had the instrumentation) to detect it?

vogon13 · Mar 16, 2005

IIRC UV instument on Voyagers set pretty austere upper limits on possible Galilean moons atmospheres. You have sodium vapor and other nasties on Io, but the rest of the flock seemed pretty vacuumish. <div class="Discussion_UserSignature"> TPTB went to Dallas and all I got was Plucked !!So many people, so few recipes !!Let's clean up this stinkhole !! </div>

chew_on_this · Mar 17, 2005

Seems odd Voyaguer didn't detect the atmosphere at Enceladus.

vogon13 · Mar 17, 2005

Cassini flew thru it. Voyager watched from afar. Also, atmosphere probably quite variable over time, should show sensitivity to how fast whatever process is putting the ionized water vapor into skies above Enceladus. Maybe there wasn't an atmosphere when Voyager flew passed. To sense remotely would probably needed to use the UV experiment. If the appropriate observation wasn't made, or was scheduled during time spent troubleshooting the temporarily stuck scan platform, then it was just bad luck they missed it in early eighties. <div class="Discussion_UserSignature"> TPTB went to Dallas and all I got was Plucked !!So many people, so few recipes !!Let's clean up this stinkhole !! </div>

chew_on_this · Mar 17, 2005

So Voyaguer was just as likely to miss an atmosphere at Europa then?

centsworth_II · Mar 17, 2005

Gallileo must have taken a close look for an atmosphere on Europa during its long mission, no? <div class="Discussion_UserSignature"> </div>

chew_on_this · Mar 17, 2005

I guess I did specifically ask that question a number of posts back. I think vogon mistook my intent (Gallileo, Gallilean). I know Jupiter does have a tenuous ring system, so maybe Europa has been idle for a great while. Thus no atmosphere and diminishing rings. Isn't speculation fun?

yurkin · Mar 17, 2005

Galileo did detect a tenuous O2 atmosphere on Europa. This is brought about by radiation from Jupiter ionizing the water rock on Europa’s surface into gaseous oxygen. One could speculate that any water vapor released by Europan cryo-volcanism would be ionized in this same fashion. This would leave no trace of it to be detected by Galileo or anyone else.

CalliArcale · Mar 17, 2005

<blockquote>In reply to:<hr />I know Jupiter does have a tenuous ring system, so maybe Europa has been idle for a great while. Thus no atmosphere and diminishing rings.<hr /></blockquote> Actually, Europa doesn't have to replenish Jupiter's rings -- Io takes care of that! <img src="/images/icons/wink.gif" /> (Io is believed to be the primary contributor of material to Jupiter's most prominent rings.) <div class="Discussion_UserSignature"> "People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint it's more like a big ball of wibbly wobbly . . . timey wimey . . . stuff." -- The Tenth Doctor, "Blink" </div>

chew_on_this · Mar 17, 2005

Shucks, forgot about Io. Pesky little moon.

Enceladus, the Europa of Saturn

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