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 9 2005, 05:11 PM
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
So.... are they excluding the possibility that the magnetic effects are being caused by an Enceladan intrinsic magnetic field (caused by a hot metal core)? And if they are, is it because the magnetometer readings don't indicate an intrinsic field, or because they don't *expect* Enceladus to have a magnetic field, so they're just not thinking that we could be seeing one?
A lot of our perceptions are bounded by our expectations, after all. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Dec 9 2005, 07:29 PM
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Senior Member Group: Members Posts: 1465 Joined: 9-February 04 From: Columbus OH USA Member No.: 13 |
QUOTE (dvandorn @ Dec 9 2005, 01:11 PM) So.... are they excluding the possibility that the magnetic effects are being caused by an Enceladan intrinsic magnetic field (caused by a hot metal core)? And if they are, is it because the magnetometer readings don't indicate an intrinsic field, or because they don't *expect* Enceladus to have a magnetic field, so they're just not thinking that we could be seeing one? I don't know if they've addressed that publically anyway. Maybe Enceladus is way too small (diameter about the distance between Los Angeles and San Jose) to have such a core? On another matter regarding the plumes: may we assume that if the plumes are sometimes sending ice particles into space with escape velocity, the plumes also sometimes emit particles with less than escape velocity that will impact somewhere downrange on the moon? If so, then is there then effectively a rain of ice particles impacting the surface, resulting in accumulation and even erosion in the preferred impact spots? After all, the particles would impact with about the same velocity they left the plume with, up to 240 m/sec. Truly a "hard rain" falling. -------------------- |
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