Enceladus Plume Search, Nov. 27 |
Enceladus Plume Search, Nov. 27 |
Nov 24 2005, 04:01 PM
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#1
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
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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Nov 28 2005, 03:21 PM
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#2
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Senior Member Group: Members Posts: 3009 Joined: 30-October 04 Member No.: 105 |
Whew.
I'm not as up on the entire archive of Enceladus images as I should be, but do we have a set of earlier images of the south polar region? --Bill -------------------- |
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Nov 28 2005, 03:27 PM
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#3
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
Too bad there isn't plume evidence on the dark limb though, rather than just where one might expect a "diamond ring" effect?
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Nov 28 2005, 03:32 PM
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#4
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Senior Member Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
QUOTE (jmknapp @ Nov 28 2005, 05:27 PM) Too bad there isn't plume evidence on the dark limb though, rather than just where one might expect a "diamond ring" effect? Well, if you consider the plume is not hot silicate lava but rather water wapor, I'd be in fact surprised to see it glow in the dark! -------------------- |
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Nov 28 2005, 03:44 PM
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#5
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
QUOTE (ugordan @ Nov 28 2005, 11:32 AM) Well, if you consider the plume is not hot silicate lava but rather water wapor, I'd be in fact surprised to see it glow in the dark! But any vapor on the dark-limb side might only have to gain a little altitude before it was in sunlight? -------------------- |
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Nov 28 2005, 03:51 PM
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#6
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Senior Member Group: Members Posts: 3652 Joined: 1-October 05 From: Croatia Member No.: 523 |
QUOTE (jmknapp @ Nov 28 2005, 05:44 PM) But any vapor on the dark-limb side might only have to gain a little altitude before it was in sunlight? Why do you insist on the plumes originating from the dark side? There isn't much evidence to support this. In any case, if it were on the dark side, when it rose to get into sunlight, it would probably appear to be practically in front of the sunlit crescent, due to the very high phase angle. In the light of the recent discovery, I think we'll need to re-analyze the Feb 17 high phase, outbound observations. There was one suspicious cloud-looking thing above the south pole also present back then, but it was attributed to scattered light/overexposure. -------------------- |
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Nov 28 2005, 03:59 PM
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#7
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
QUOTE (ugordan @ Nov 28 2005, 11:51 AM) Not insisting, I just said that it's too bad there isn't evidence elsewhere too, rather than just in the center of the crescent. QUOTE (ugordan @ Nov 28 2005, 11:51 AM) In the light of the recent discovery, I think we'll need to re-analyze the Feb 17 high phase, outbound observations. There was one suspicious cloud-looking thing above the south pole also present back then, but it was attributed to scattered light/overexposure. Sure enough, and lo and behold that suspicious cloud-looking thing was very near the south pole too as you say, and not in the center of the crescent! In that image north is oriented up. Dismissed at the time as an artifact? Well, well! -------------------- |
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Nov 28 2005, 04:49 PM
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#8
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Interplanetary Dumpster Diver Group: Admin Posts: 4405 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
QUOTE (jmknapp @ Nov 28 2005, 03:59 PM) Not insisting, I just said that it's too bad there isn't evidence elsewhere too, rather than just in the center of the crescent. Sure enough, and lo and behold that suspicious cloud-looking thing was very near the south pole too as you say, and not in the center of the crescent! In that image north is oriented up. Dismissed at the time as an artifact? Well, well! I think that there was always suspicion, but they wanted to avoid the humiliation of announcing a great discovery and then having to retract it. -------------------- |
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Nov 28 2005, 05:56 PM
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#9
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
Here's a map of the south polar region, based on Steve Alber's latest cylindrical projection (click for larger image):
This is an orthonormal projection, so the limb is the equator and the south pole ("tiger scratch" feature) is at the center of the image. -------------------- |
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