New Horizons at Europa |
New Horizons at Europa |
Guest_AlexBlackwell_* |
Feb 27 2007, 09:31 PM
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#1
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Guests |
Time to start a thread about a far more interesting jovian moon
Passing probe to study 'crop circles' on Europa 17:38 27 February 2007 NewScientist.com news service Kelly Young |
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Mar 4 2007, 10:11 AM
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#2
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Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
Surface escape speed at Enceladus ~ 239 m/sec.
Surface escape speed at Europa ~ 2026 m/sec. (Quick and dirty escape velocity calculations\spreadsheet here ) I don't believe that we have much in the way of accurate data on the velocity profile of the contents of the plumes at the moment but my understanding is that the observed density profile strongly suggests that the majority of the material is slower than the Enceladan (osian? usian? Yankee?) escape velocity (e.g the concusion from this paper - Understanding the escape of water from Enceladus by Burger et al) . |
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Mar 4 2007, 02:29 PM
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#3
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Member Group: Members Posts: 121 Joined: 26-September 05 From: Philadelphia Member No.: 507 |
I don't believe that we have much in the way of accurate data on the velocity profile of the contents of the plumes at the moment but my understanding is that the observed density profile strongly suggests that the majority of the material is slower than the Enceladan i'm confused… the way you wrote that sounds like you are comparing plumes on enceladus to those on europa. i would love someone to tell me that i somehow missed the discovery of emissions at europa -------------------- |
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Mar 4 2007, 07:24 PM
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#4
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Dublin Correspondent Group: Admin Posts: 1799 Joined: 28-March 05 From: Celbridge, Ireland Member No.: 220 |
i'm confused… the way you wrote that sounds like you are comparing plumes on enceladus to those on europa. i would love someone to tell me that i somehow missed the discovery of emissions at europa Apologies - I was just responding to Edstrick's question regarding escape velocities. No one has found any plumes on Europa as far as I'm aware. The thread started on the back of speculation that NH might be able to image a dust\gas\debris torus if one existed * - the escape velocity point indicates that the Enceladan mechanism would probably be incapable of achieving escape velocity for any material on Europa even in the (unlikely) event that it also existed there. this was all entirely speculative, at least from my POV. Edited to add: I see that vexgismo has pointed out that Cassini has already found just such a torus. Well explaining that is going to be fun. |
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