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Enceladus Plume Search, Nov. 27
jmknapp
post Nov 24 2005, 04:01 PM
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Interesting item in the science plan kernel (S16) just released to the NAIF website:

OBSERVATION_ID: S1629

SEQUENCE: S16

OBSERVATION_TITLE: Plume Search

SCIENCE_OBJECTIVE: Hope to detect/observe plumes, whether from volcanic activity or geysers.

OBS_DESCRIPTION: Point and stare.

SUBSYSTEM: ISS

PRIMARY_POINTING: ISS_NAC to Enceladus (0.0,5.0,0.0 deg. offset)

REQUEST_ID: ISS_018EN_PLUMES001_PRIME

REQUEST_TITLE: ENCELADUS Geyser/Plume Search

REQ_DESCRIPTION: 1;ENCELADUS Geyser/Plume Search 1x1xNPp -- 3 different exposures

BEGIN_TIME: 2005 NOV 27 19:00:00 UTC

END_TIME: 2005 NOV 27 20:00:00 UTC


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scalbers
post Nov 29 2005, 08:44 PM
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My guess is that the rays are actual streamers of material instead of sun rays. This somewhat reminds me of cometary jets. Are cometary jets presumed to be liquid or vapor generally? I suppose a geyser on earth can also emit either vapor (condensing into steam) or liquid water. Would a determination of ice particle size help constrain whether it was likely to be steam or water?


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JRehling
post Nov 29 2005, 09:21 PM
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QUOTE (scalbers @ Nov 29 2005, 12:44 PM)
My guess is that the rays are actual streamers of material instead of sun rays. This somewhat reminds me of cometary jets. Are cometary jets presumed to be liquid or vapor generally? I suppose a geyser on earth can also emit either vapor (condensing into steam) or liquid water. Would a determination of ice particle size help constrain whether it was likely to be steam or water?
*


There is clearly some anisotropy going on here, and I think we can rule out the solar illumination and the camera as possible sources... It appears as though these fountains have a considerable non-vertical component in their initial emission, which means that this isn't just a mist rising lazily up from warm ice -- these are geysers.

We see more than three fountains (more like eight or nine, plus possibly more minor ones), so I agree that the tiger stripes are probably active in selective locations, and not everywhere along a stripe once.

As for the dynamics, we surely have some sort of pressure below. The crust may be moving, although in what way, I don't claim to know. Surely if the volume of emission falls below a certain rate at any location, rapid freezing will overwhelm the process and pinch a fault (locally) closed.

I think that each tiger stripe overlies a warm area about as wide as the area *between* the stripes, with the stripe being the place where emission can take place. This activity probably shifts over time, although it may be going on all the time *somewhere*. For example, maybe there are sixty or so places where fountains can spray out, but at any given time, only ten or so are actually spewing. And, yes, I pulled those numbers out of thin air.

I'm not sure what kind of mission would target Enceladus next. An orbiter might face a mechanical hazard from the plumes. The question is if a stable orbit could fly above the plumes. If the plumes are all highly localized, one solution would be an inclined orbit that misses the full blast of the spray. A lander is always an option, and seismology would be interesting. Another possible followup would be a Saturn orbiter -- perhaps one that observes both Enceladus and the rings without sacrificing too much in design to the dual needs? It seems less likely that a focused Enceladus+Titan mission could do much beyond what Cassini already provides. Other than quaint images of opportunity, it seems like a mission dedicated to one of those high-priority moons would not offer much in terms of performing science at the other. An incremental improvement on Cassini would fit the bill, but I think any Titan followup will be a quantum leap from Cassini to the next thing (eg, aerobot).
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tedstryk
post Nov 29 2005, 11:44 PM
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This makes me wonder about Europa, where high phase coverage is extremely limited. Also, a volcano of equal force would have a smaller plume at Europa, since there would be much stronger gravity.


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Posts in this topic
- jmknapp   Enceladus Plume Search, Nov. 27   Nov 24 2005, 04:01 PM
- - jmknapp   Here's the view of Enceladus during the plume ...   Nov 26 2005, 11:02 PM
|- - ElkGroveDan   QUOTE (jmknapp @ Nov 26 2005, 11:02 PM)Here...   Nov 27 2005, 12:15 AM
||- - David   QUOTE (ElkGroveDan @ Nov 27 2005, 12:15 AM)Lo...   Nov 28 2005, 11:54 PM
|- - dilo   Thanks for all these informations, jmknapp (also i...   Nov 27 2005, 08:04 AM
|- - jmknapp   QUOTE (dilo @ Nov 27 2005, 04:04 AM)Really ho...   Nov 27 2005, 02:13 PM
|- - mgrodzki   that is a nice image… not color right? and i assum...   Nov 27 2005, 06:24 PM
|- - dilo   QUOTE (mgrodzki @ Nov 27 2005, 06:24 PM)that ...   Nov 28 2005, 06:41 AM
- - Decepticon   Images Up. http://saturn1.jpl.nasa.gov/multimed...   Nov 28 2005, 01:10 PM
|- - SFJCody   http://saturn1.jpl.nasa.gov/multimedia/ima...6/N00...   Nov 28 2005, 01:29 PM
- - alan   Possible plume? Doesn't look like a lens flare...   Nov 28 2005, 01:31 PM
|- - ugordan   QUOTE (alan @ Nov 28 2005, 03:31 PM)Possible ...   Nov 28 2005, 01:38 PM
|- - Bjorn Jonsson   This is the first time I see something like this t...   Nov 28 2005, 01:49 PM
|- - tedstryk   I am at work, or I would do this myself, but someo...   Nov 28 2005, 02:12 PM
|- - Bjorn Jonsson   QUOTE (tedstryk @ Nov 28 2005, 02:12 PM)I am ...   Nov 28 2005, 02:18 PM
- - Decepticon   Is there enough pics for a animation?   Nov 28 2005, 02:14 PM
- - Mariner9   ohmygod!!!!!!!!...   Nov 28 2005, 03:10 PM
- - Bill Harris   Whew. I'm not as up on the entire archive of ...   Nov 28 2005, 03:21 PM
|- - jmknapp   Too bad there isn't plume evidence on the dark...   Nov 28 2005, 03:27 PM
|- - ugordan   QUOTE (jmknapp @ Nov 28 2005, 05:27 PM)Too ba...   Nov 28 2005, 03:32 PM
||- - jmknapp   QUOTE (ugordan @ Nov 28 2005, 11:32 AM)Well, ...   Nov 28 2005, 03:44 PM
||- - ugordan   QUOTE (jmknapp @ Nov 28 2005, 05:44 PM)But an...   Nov 28 2005, 03:51 PM
||- - jmknapp   QUOTE (ugordan @ Nov 28 2005, 11:51 AM)Why do...   Nov 28 2005, 03:59 PM
||- - tedstryk   QUOTE (jmknapp @ Nov 28 2005, 03:59 PM)Not in...   Nov 28 2005, 04:49 PM
||- - jmknapp   Here's a map of the south polar region, based ...   Nov 28 2005, 05:56 PM
|||- - jmknapp   Found this image of the south polar region (approx...   Nov 28 2005, 06:41 PM
|||- - The Messenger   QUOTE (jmknapp @ Nov 28 2005, 10:56 AM)Here...   Nov 28 2005, 08:44 PM
||- - scalbers   QUOTE (tedstryk @ Nov 28 2005, 04:49 PM)I thi...   Nov 28 2005, 08:17 PM
||- - dilo   QUOTE (tedstryk @ Nov 28 2005, 04:49 PM)I thi...   Nov 28 2005, 09:03 PM
|- - JRehling   QUOTE (jmknapp @ Nov 28 2005, 07:27 AM)Too ba...   Nov 28 2005, 03:35 PM
- - tasp   What is the power source for this? {Wild speculat...   Nov 28 2005, 03:51 PM
- - Orlin Denkov   In the title of this thread isn't it Enceladus...   Nov 28 2005, 03:55 PM
- - volcanopele   ^^ Fixed   Nov 28 2005, 03:56 PM
|- - The Messenger   The source of the heat is truly perplexing. I hope...   Nov 28 2005, 04:48 PM
- - tasp   Maybe I am 'seeing' too much into your map...   Nov 28 2005, 06:29 PM
- - canis_minor   The features seen in these images are located at t...   Nov 28 2005, 07:21 PM
- - Bill Harris   The ridges and wrinkles in that region are a stron...   Nov 28 2005, 07:37 PM
|- - Bjorn Jonsson   I'm attaching a rendering I did showing the vi...   Nov 28 2005, 08:47 PM
|- - jmknapp   QUOTE (Bjorn Jonsson @ Nov 28 2005, 04:47 PM)...   Nov 28 2005, 10:01 PM
|- - mars loon   This news just released by CICLOPS website ...   Nov 28 2005, 10:31 PM
- - volcanopele   Special release for the Enceladus plume: http://c...   Nov 28 2005, 09:59 PM
|- - ugordan   QUOTE (volcanopele @ Nov 28 2005, 11:59 PM)Fo...   Nov 29 2005, 08:07 AM
- - Sunspot   What's also striking is how obvious the plumes...   Nov 28 2005, 10:48 PM
|- - mars loon   QUOTE (Sunspot @ Nov 28 2005, 10:48 PM)What...   Nov 28 2005, 11:29 PM
- - akuo   Looking at the raws I noticed that the whole backg...   Nov 28 2005, 11:29 PM
|- - EccentricAnomaly   The E-Ring is just such a donut of material around...   Nov 29 2005, 12:44 AM
- - edstrick   Regarding the plume images: Feb 20, I posted: htt...   Nov 29 2005, 07:50 AM
|- - volcanopele   QUOTE (edstrick @ Nov 29 2005, 12:50 AM)NOW.....   Nov 29 2005, 07:30 PM
|- - jmknapp   One thing that strikes me in the CICLOPS press rel...   Nov 29 2005, 08:08 PM
- - BruceMoomaw   Crowing about one's foresight is bad manners, ...   Nov 29 2005, 08:23 AM
- - edstrick   (grins a bit toothily at Bruce Moomaw, canary feat...   Nov 29 2005, 08:39 AM
- - Gsnorgathon   Good for you, Ed! Crow all you like! (Actu...   Nov 29 2005, 10:52 AM
- - edstrick   I doubt there's enough parallax during the hig...   Nov 29 2005, 11:55 AM
|- - ugordan   Regarding the possibility of more intense Enceladu...   Nov 29 2005, 12:16 PM
|- - jmknapp   We're set for a Christmas rerun: The above ...   Nov 29 2005, 02:18 PM
||- - ugordan   QUOTE (jmknapp @ Nov 29 2005, 03:18 PM)The ab...   Nov 29 2005, 02:33 PM
||- - jmknapp   QUOTE (ugordan @ Nov 29 2005, 10:33 AM)That...   Nov 29 2005, 03:40 PM
|- - The Messenger   QUOTE (ugordan @ Nov 29 2005, 05:16 AM)Option...   Nov 29 2005, 05:18 PM
|- - jmknapp   QUOTE (ugordan @ Nov 29 2005, 08:16 AM)Regard...   Nov 30 2005, 01:59 AM
- - Omega   Regarding possible artifact-- QUOTE Images of oth...   Nov 29 2005, 05:53 PM
- - scalbers   My guess is that the rays are actual streamers of ...   Nov 29 2005, 08:44 PM
|- - Rob Pinnegar   QUOTE (scalbers @ Nov 29 2005, 02:44 PM)My gu...   Nov 29 2005, 09:20 PM
|- - Marz   QUOTE (scalbers @ Nov 29 2005, 02:44 PM)Would...   Nov 29 2005, 09:20 PM
|- - JRehling   QUOTE (scalbers @ Nov 29 2005, 12:44 PM)My gu...   Nov 29 2005, 09:21 PM
|- - tedstryk   This makes me wonder about Europa, where high phas...   Nov 29 2005, 11:44 PM
- - BruceMoomaw   QUOTE (jmknapp @ Nov 29 2005, 08:08 PM)If it ...   Nov 30 2005, 03:00 AM
|- - tedstryk   Galileo came up cold, but Europa is much bigger, a...   Nov 30 2005, 03:54 AM
|- - The Messenger   QUOTE (BruceMoomaw @ Nov 29 2005, 08:00 PM).....   Nov 30 2005, 04:34 AM
- - edstrick   Various comments and responses: Looking at jmknap...   Nov 30 2005, 06:24 AM
|- - jmknapp   QUOTE (edstrick @ Nov 30 2005, 02:24 AM)Vario...   Nov 30 2005, 01:24 PM
||- - ugordan   QUOTE (jmknapp @ Nov 30 2005, 02:24 PM)Intere...   Nov 30 2005, 01:38 PM
||- - jmknapp   QUOTE (ugordan @ Nov 30 2005, 09:38 AM)Of cou...   Nov 30 2005, 04:48 PM
|- - The Messenger   QUOTE (edstrick @ Nov 29 2005, 11:24 PM)What ...   Dec 1 2005, 03:17 AM
- - edstrick   And, Oh... from the Utter Loonacy Department. M...   Nov 30 2005, 06:29 AM
- - Webscientist   Astonishing news, I'm really surprised to see ...   Nov 30 2005, 09:36 AM
- - Bill Harris   > from the Utter Loonacy Department... Aye, Ca...   Nov 30 2005, 10:42 AM
- - BruceMoomaw   That last quote was actually a misinterpretation b...   Dec 1 2005, 12:33 AM
|- - mars loon   QUOTE (BruceMoomaw @ Dec 1 2005, 12:33 AM)Wha...   Dec 1 2005, 12:48 AM
|- - ugordan   QUOTE (BruceMoomaw @ Dec 1 2005, 01:33 AM)Wha...   Dec 1 2005, 08:39 AM
|- - jmknapp   QUOTE (BruceMoomaw @ Nov 30 2005, 08:33 PM)Th...   Dec 1 2005, 12:23 PM
|- - jmknapp   Closeups of the tiger stripes are intriguing but a...   Dec 1 2005, 01:08 PM
- - deglr6328   There is a second derivative of two ammonia absorp...   Dec 1 2005, 09:14 AM
- - edstrick   Ugordan: "....but haven't there been some...   Dec 1 2005, 11:28 AM
- - dvandorn   Based on the shadows, the sun is on the *right*......   Dec 1 2005, 01:14 PM
|- - jmknapp   QUOTE (dvandorn @ Dec 1 2005, 09:14 AM)Based ...   Dec 1 2005, 01:22 PM
|- - ugordan   QUOTE (jmknapp @ Dec 1 2005, 02:22 PM)So the ...   Dec 1 2005, 02:04 PM
- - dvandorn   In the context image, your point is clear... but g...   Dec 1 2005, 02:18 PM
|- - jmknapp   QUOTE (dvandorn @ Dec 1 2005, 10:18 AM)In the...   Dec 1 2005, 02:40 PM
- - David   Enceladus is the "shiniest" moon in the ...   Dec 1 2005, 02:47 PM
|- - ugordan   QUOTE (David @ Dec 1 2005, 03:47 PM)Enceladus...   Dec 1 2005, 02:55 PM
- - Bill Harris   QUOTE (jmknapp @ Dec 1 2005, 08:40 AM)It...   Dec 1 2005, 04:09 PM
- - tasp   How fast are these plumes turning Enceladus inside...   Dec 1 2005, 05:01 PM
|- - ugordan   QUOTE (tasp @ Dec 1 2005, 06:01 PM)Any chance...   Dec 2 2005, 08:10 AM
- - dvandorn   The question that comes to my mind is: If "w...   Dec 2 2005, 08:14 AM
- - jmknapp   Interesting comments from Dr. Carolyn Porco: ...   Dec 2 2005, 11:18 AM
- - ugordan   QUOTE (jmknapp @ Dec 2 2005, 12:18 PM)Interes...   Dec 2 2005, 11:50 AM
- - jmknapp   QUOTE (ugordan @ Dec 2 2005, 07:50 AM)So they...   Dec 2 2005, 11:57 AM
- - ugordan   Regarding the source of the heat, there is a relat...   Dec 2 2005, 12:15 PM
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