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Enceladus' "Hot Start"
nprev
post Mar 14 2007, 12:27 AM
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The Cassini website as well as the mass media is announcing a 'new' hypothesis on internal heating. The article also states that complex (presumably) organic molecules observed in the plumes imply an active heat source. Anybody have more details?

I still can't figure out exactly how Enceladus might have been particularly enriched in Al-26 with respect to the other icy moons, other than its proximity to Saturn during its formation... huh.gif


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volcanopele
post Mar 14 2007, 05:50 AM
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Actually, the idea that Enceladus maybe have enriched in Al-26 is based on the shape and surface age of Iapetus. That data suggests that the Saturnian satellite system formed fairly quickly, before the short-lived radionuclides like Al-26 had decayed. For a moon with a high rock fraction like Enceladus, this helped to heat the moon to the point that it could have a molten interior. Once Enceladus had a molten interior, the current amount of tidal heating would be enough to maintain the active interior.


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post Mar 14 2007, 03:56 PM
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Ah...thanks, VP, figured that the "jump start" scenario probably was something like you described. Do you happen to know if Enceladus has a significantly higher mean density than the other icy moons?

Hmm...come to that, maybe this concept is more widely applicable. (Possible OT alert, here.) After all, Earth is the densest terrestrial planet, undergoes significant tidal stress, and is undeniably tectonically active...did we just get a better initial jump-start than Venus & Mars?


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stevesliva
post Apr 19 2007, 07:19 PM
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I'll piggyback on this Enceladus origin thread to comment that the South Pole is mentioned here:
http://space.newscientist.com/article/dn11625
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alan
post Apr 20 2007, 06:10 PM
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CHARM -- Enceladus: Cassini Finds Another Active World
The next "Cassini-Huygens Analysis and Results of the Mission" (CHARM) teleconference is Tuesday, April 24, from 11:00 a.m. to 1:00 p.m. Pacific Time. Dr. John Spencer presents.

60 page 5.2 MB pdf of slides:
http://saturn.jpl.nasa.gov/multimedia/prod...ARM_Spencer.pdf
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elakdawalla
post Apr 20 2007, 06:28 PM
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That presentation is a really valuable chronological summary of the Enceladus story. And I love those diagrams showing how all the data acquired so far (and to be acquired) maps out in space with respect to Enceladus. But I think of all the pics in the presentation, my favorite is the "action shot" of Michelle Dougherty arguing for lowering the Rev 11 flyby. smile.gif

--Emily


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volcanopele
post Apr 20 2007, 07:12 PM
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It's sad. I'm only an undergrad and I've already been to enough of these meetings to tell who the other people in that image are just by looking at the back of their heads...


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elakdawalla
post Apr 20 2007, 07:47 PM
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It's Bonnie and Dennis, right? smile.gif

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volcanopele
post Apr 20 2007, 07:49 PM
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Yeah, I'm pretty sure that's the case.

Anyways, that is a nice presentation. Good info on the extended mission for those who haven't seen some of the details on the XM Enceladus encounters.


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Juramike
post Apr 20 2007, 08:29 PM
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21 km flyby? ohmy.gif

I didn't know Cassini was also a lander.


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ugordan
post Apr 20 2007, 10:17 PM
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Them navigation guys better not do any of them metric-imperial conversions!


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john_s
post Apr 20 2007, 10:52 PM
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QUOTE (elakdawalla @ Apr 20 2007, 07:47 PM) *
It's Bonnie and Dennis, right? smile.gif


Yup, Bonnie and Dennis.

Um- is it just me, or are a bunch of the graphics and backgrounds messed up in the posted version of the PDF?

John.
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volcanopele
post Apr 20 2007, 11:06 PM
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Using Adobe Acrobat Reader 8 on a Windows machine, the file looks just fine.


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stevesliva
post Apr 20 2007, 11:39 PM
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Looked fine to me as well. Nice presentation!
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nprev
post Apr 20 2007, 11:47 PM
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Looked great to me using XP & Acrobat 7 as well.

Loved the last bullet..."you ain't seen nothin' yet"...definitely gonna hold 'em to that! tongue.gif


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