Enceladus Plume Search, Nov. 27 |
Enceladus Plume Search, Nov. 27 |
Nov 24 2005, 04:01 PM
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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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Dec 6 2005, 07:24 PM
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Press Release: NASA's Cassini Images Reveal Spectacular Evidence of an Active Moon
http://ciclops.org/view.php?id=1714 4-frame movie showing plumes: http://ciclops.org/view.php?id=1702 -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Dec 7 2005, 11:02 AM
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
Exploring this ice sublimation theory some more...
If ice is subliming in sufficient quantities to create powerful jets sending water vapor and/or particles into space at hundreds of meters per second, it seem that the pressure at the vents must be very high, well over atmospheric pressure on Earth? Also, the temperature of the jets must be over 273K, no? That translates to a lot of heat, which would tend to melt the sides of the tiger stripes where the vents issue. The Cassini team has released a color image of the area: Dr. Esposito of the Cassini team referred to the bluish tinge of the tiger stripes in the above image: QUOTE The parallel stripes were unexpected from earlier images and show two things; they show that there’s been a recent, we don’t know exactly how recent, many millions and even billions of years, but a recent event which has covered up the southern region of Enceladus and that has stretched the surface so that it’s broken to form these fissures, which we see as tiger stripes. The color of those features is a bluish hue, and that bluish hue says that the ice that’s in the fissures, in those tiger stripes, that the ice there is relatively young and may be fresh, at least geologically fresh. So with this information, there is geologic evidence of recent resurfacing and splitting of the icy surface of Enceladus. Could the hot plumes of water vapor be melting the tiger stripes and entraining atomized water droplets in the stream? Moreover, the plumes would quickly cool and wouldn't that tend to make the water vapor and/or droplets condense as ice or even snow? Maybe the plumes act as enormous snow machines: Ski Enceladus! -------------------- |
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