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Unmanned Spaceflight.com > Outer Solar System > Saturn > Cassini Huygens > Cassini's ongoing mission and raw imagesDione Outgassing? |
 Mar 15 2007, 03:31 PM
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#1
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 Merciless Robot  Group: Admin Posts: 8791 Joined: 8-December 05 From: Los Angeles Member No.: 602  |
Very, very little in comparision to Enceladus, but there may be some small-scale current activity. Article here.
-------------------- 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.
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Mar 15 2007, 09:08 PM
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#2
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Member Group: Members Posts: 241 Joined: 16-May 06 From: Geneva, Switzerland Member No.: 773 |
So, they indeed were looking for a plume at Dione when they took images at high phase angles !!
Marc. |
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Mar 15 2007, 09:21 PM
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#3
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Junior Member Group: Members Posts: 61 Joined: 17-September 05 From: Sweden Member No.: 499 |
How can we be sure that it's just not ejecta from impacts? Sounds like very small amounts of materials leaving the moon.
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Mar 15 2007, 09:31 PM
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#4
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Member Group: Members Posts: 509 Joined: 2-July 05 From: Calgary, Alberta Member No.: 426 |
QUOTE (Adam @ Mar 15 2007, 03:21 PM)  How can we be sure that it's just not ejecta from impacts? By taking similar measurements for Tethys and Rhea. Dione and Enceladus are actually in an orbital resonance... I guess that what we are seeing here is the warmth at the other end of the hot poker, so to speak. |
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Mar 16 2007, 01:06 AM
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#5
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 Member Group: Members Posts: 813 Joined: 29-December 05 From: NE Oh, USA Member No.: 627 |
Enceladus and Dione are the densest of the icy Satrunian moons
Enceladus at 1.61 Dione at 1.44 See this CHARM presentation for predictions of Dione outgassing. http://saturn.jpl.nasa.gov/multimedia/prod...ARM_Krishan.pdf More AL26 in their early compositions? Craig |
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Mar 24 2007, 05:56 PM
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#6
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Solar System Cartographer Group: Members Posts: 10265 Joined: 5-April 05 From: Canada Member No.: 227 |
Nothing to do with outgassing, but here are the latest pics of Dione - I have merged the two and fiddled with the brightness of the terminator and saturnshine area.
Phil
-------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Mar 24 2007, 06:02 PM
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#7
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 Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
I don't know whether it may have something to do with this, or whether this phenomenon has been explained in some way, but I remember that the Voyagers discovered that radio emissions from Saturn are further modulated with a period matching that of Dione.
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Mar 24 2007, 06:02 PM
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#8
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Merciless Robot Group: Admin Posts: 8791 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
Nice, Phil!
Hate to say it, but I don't think there's any way in hell to visually spot "plumes" who's average output is about 6g per second. Hopefully we can get some targeted hi-res IR along the floors of some of those canyons... -------------------- 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.
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Mar 24 2007, 07:38 PM
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#9
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 Senior Member Group: Members Posts: 1688 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Phil - nice image, where might that basin be? The best candidate I can spot on my map would be near 210 E longitude and 50S.
-------------------- Steve [ my home page and planetary maps page ]
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Mar 24 2007, 09:02 PM
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#10
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Solar System Cartographer Group: Members Posts: 10265 Joined: 5-April 05 From: Canada Member No.: 227 |
It's the same one we have often seen before in these southern hemisphere views, Steve, just a bit west of the Voyager 1 area. There's only one near the South pole.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Apr 9 2007, 04:12 PM
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#11
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Solar System Cartographer Group: Members Posts: 10265 Joined: 5-April 05 From: Canada Member No.: 227 |
Yikes - here it is again. This new sequence has a very long exposure image... Carolyn had better get onto it before someone else starts publishing latin anagrams.
Phil
-------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Apr 9 2007, 05:26 PM
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#12
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 Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
I'm having trouble orienting myself here...would one of you image magicians be so kind as to post a polar projection of Dione's south pole?
--Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Apr 9 2007, 05:34 PM
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#13
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 Senior Member Group: Moderator Posts: 3242 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
This observation covers the southern leading hemisphere. The big crater at upper left is Dido, the fractures cutting from upper right to lower left across the middle of the image are the southern part of Palatine Linea, and the large crater to the left of the big basin is Sabinus.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Apr 9 2007, 05:37 PM
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#14
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Administrator Group: Admin Posts: 5172 Joined: 4-August 05 From: Pasadena, CA, USA, Earth Member No.: 454 |
Where is the south pole on this image? That's what I'm having trouble figuring out.
--Emily -------------------- My website - My Patreon - @elakdawalla on Twitter - Please support unmannedspaceflight.com by donating here.
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Apr 9 2007, 05:37 PM
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#15
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Merciless Robot Group: Admin Posts: 8791 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
QUOTE (Paolo @ Mar 24 2007, 11:02 AM) I remember that the Voyagers discovered that radio emissions from Saturn are further modulated with a period matching that of Dione. ...yeah, I remember that too! Does Dione have an associated torus of water & dissociate products like Enceladus, albeit much more attenuated? -------------------- 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.
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