My Assistant
Enceladus' "Hot Start" |
Mar 14 2007, 12:27 AM
Post
#1
|
|
|
Merciless Robot ![]() ![]() ![]() ![]() Group: Admin Posts: 8791 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
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... -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
|
|
|
|
![]() |
Mar 14 2007, 05:50 AM
Post
#2
|
|
![]() Senior Member ![]() ![]() ![]() ![]() Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
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.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
|
|
|
Mar 14 2007, 03:56 PM
Post
#3
|
|
|
Merciless Robot ![]() ![]() ![]() ![]() Group: Admin Posts: 8791 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
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? -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
|
|
|
|
Apr 19 2007, 07:19 PM
Post
#4
|
|
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1599 Joined: 14-October 05 From: Vermont Member No.: 530 |
I'll piggyback on this Enceladus origin thread to comment that the South Pole is mentioned here:
http://space.newscientist.com/article/dn11625 |
|
|
|
Apr 20 2007, 06:10 PM
Post
#5
|
|
![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1887 Joined: 20-November 04 From: Iowa Member No.: 110 |
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 |
|
|
|
Apr 20 2007, 06:28 PM
Post
#6
|
|
![]() Administrator ![]() ![]() ![]() ![]() Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
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.
--Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
|
|
|
|
Apr 20 2007, 07:12 PM
Post
#7
|
|
![]() Senior Member ![]() ![]() ![]() ![]() Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
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...
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
|
|
|
Apr 20 2007, 07:47 PM
Post
#8
|
|
![]() Administrator ![]() ![]() ![]() ![]() Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
It's Bonnie and Dennis, right?
--Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
|
|
|
|
Apr 20 2007, 07:49 PM
Post
#9
|
|
![]() Senior Member ![]() ![]() ![]() ![]() Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
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. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
|
|
|
Apr 20 2007, 08:29 PM
Post
#10
|
|
![]() Senior Member ![]() ![]() ![]() ![]() Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
21 km flyby?
I didn't know Cassini was also a lander. -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
|
|
|
|
Apr 20 2007, 10:17 PM
Post
#11
|
|
![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
Them navigation guys better not do any of them metric-imperial conversions!
-------------------- |
|
|
|
Apr 20 2007, 10:52 PM
Post
#12
|
|
![]() Member ![]() ![]() ![]() Group: Members Posts: 722 Joined: 3-December 04 From: Boulder, Colorado, USA Member No.: 117 |
|
|
|
|
Apr 20 2007, 11:06 PM
Post
#13
|
|
![]() Senior Member ![]() ![]() ![]() ![]() Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Using Adobe Acrobat Reader 8 on a Windows machine, the file looks just fine.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
|
|
|
Apr 20 2007, 11:39 PM
Post
#14
|
|
|
Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1599 Joined: 14-October 05 From: Vermont Member No.: 530 |
Looked fine to me as well. Nice presentation!
|
|
|
|
Apr 20 2007, 11:47 PM
Post
#15
|
|
|
Merciless Robot ![]() ![]() ![]() ![]() Group: Admin Posts: 8791 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
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! -------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
|
|
|
|
![]() ![]() |
|
Lo-Fi Version | Time is now: 16th December 2024 - 04:58 AM |
|
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |
|