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Enceladus-3 (March 12, 2008)
Guest_AlexBlackwell_*
post Feb 24 2006, 09:12 PM
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Excerpt from Cassini Significant Events for 02/16/06 - 02/22/06:

"As mentioned in previous weeks, the project has been working on adopting a new reference trajectory in order to raise the minimum Titan flyby altitude for various encounters. Today the project reached a decision to proceed with the 'optocc2' trajectory. Additional work is still to be performed before delivery of the final files. This will include minor tweaks that have been analyzed in other trajectories, adjusting orbit 68 timing, and capture of an Enceladus plume occultation on orbit 28."

For the record, the new reference trajectory will result in an even more spectacular Enceladus-3 flyby [61EN (t) E3] on March 12, 2008.
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volcanopele
post Mar 10 2006, 07:36 PM
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a few notes:

E3 Imaging: Don't expect super high res images. Cassini will be approaching Enceladus while the moon is in high phase and closest approach will occur over the night side. A good amount of the blur in the high res images from July were because we were tracking gamma Orionis, not a point on the surface. If we were targeting the surface and had 5 ms exposures, it's possible the smear would be less, though as Bruce mentioned, you also have to keep the spacecraft point so that the HGA is in the RAM direction to protect the spacecraft from E-ring particles. Unfortunately, to see anything in saturn-shine, as would be possible at closest approach, we would need significantly more than 5 ms exposures to see anything. And that's assuming we had prime pointing. Which as of right now, we don't (INMS does I think). Then, three minutes after C/A, Enceladus goes into eclipse. Plenty of time for CIRS to look for even higher temps, but not good for ISS imaging.

Composition of reservoir: INMS observations of the plume suggest that it isn't pure H2O. Their composition measurements suggest 91% H2O, 3% CO2, 3.3% N2 (though CO is possible), and 1.6% CH4.


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Guest_RGClark_*
post Mar 11 2006, 03:33 PM
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QUOTE (volcanopele @ Mar 10 2006, 07:36 PM) *
...
Composition of reservoir: INMS observations of the plume suggest that it isn't pure H2O. Their composition measurements suggest 91% H2O, 3% CO2, 3.3% N2 (though CO is possible), and 1.6% CH4.


Jason, does Cassini have the capability to do an isotopic measurement on that methane?


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JRehling
post Mar 11 2006, 06:58 PM
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One Enceladus mission I could see flying would be a sample return that flies through the plume (assuming it is "on" all the time -- what a horror if it weren't!) and brings the stuff back to Earth on a free return trajectory, or cruising there and back with NEP. Moreover, the same mission could grab some upper atmosphere stuff from Titan and/or the rings and/or Saturn (though surely not all four). Several add-ons could be imagined: an imaging impactor, etc.
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Posts in this topic
- AlexBlackwell   Enceladus-3 (March 12, 2008)   Feb 24 2006, 09:12 PM
- - BruceMoomaw   It was casually confirmed in one of the new EGU ab...   Feb 25 2006, 04:03 AM
- - volcanopele   Even though the encounter distance is closer, don...   Feb 25 2006, 04:12 AM
|- - AlexBlackwell   QUOTE (volcanopele @ Feb 25 2006, 04:12 A...   Feb 27 2006, 04:13 PM
|- - Holder of the Two Leashes   QUOTE (volcanopele @ Feb 24 2006, 10:12 P...   Feb 27 2006, 04:40 PM
|- - ljk4-1   Check this out: http://drudgereport.com/flash8na....   Mar 9 2006, 06:42 PM
|- - volcanopele   QUOTE (ljk4-1 @ Mar 9 2006, 11:42 AM...   Mar 9 2006, 07:37 PM
|- - AlexBlackwell   QUOTE (volcanopele @ Mar 9 2006, 07:37 PM...   Mar 9 2006, 07:43 PM
- - BruceMoomaw   TWENTY-FIVE KM?!! You guys are really taki...   Mar 9 2006, 09:36 PM
|- - ugordan   QUOTE (BruceMoomaw @ Mar 9 2006, 10:36 PM...   Mar 9 2006, 09:42 PM
|- - AlexBlackwell   QUOTE (BruceMoomaw @ Mar 9 2006, 09:36 PM...   Mar 9 2006, 09:47 PM
||- - volcanopele   Technically, that number is official (well, it isn...   Mar 9 2006, 10:12 PM
|||- - AlexBlackwell   QUOTE (volcanopele @ Mar 9 2006, 10:12 PM...   Mar 9 2006, 10:17 PM
|||- - EccentricAnomaly   QUOTE (volcanopele @ Mar 9 2006, 02:12 PM...   Mar 10 2006, 04:43 AM
|||- - AlexBlackwell   QUOTE (EccentricAnomaly @ Mar 10 2006, 04...   Mar 10 2006, 04:26 PM
|||- - JRehling   Various notes: However we might wring our hands o...   Mar 10 2006, 05:32 PM
|||- - AlexBlackwell   QUOTE (JRehling @ Mar 10 2006, 05:32 PM) ...   Mar 10 2006, 06:07 PM
|||- - RGClark   QUOTE (JRehling @ Mar 10 2006, 05:32 PM) ...   Mar 10 2006, 06:26 PM
||- - AlexBlackwell   QUOTE (AlexBlackwell @ Mar 9 2006, 09:47 ...   Mar 15 2006, 08:38 PM
|- - The Messenger   QUOTE (BruceMoomaw @ Mar 9 2006, 02:36 PM...   Mar 9 2006, 10:23 PM
|- - ugordan   QUOTE (The Messenger @ Mar 9 2006, 11:23 ...   Mar 9 2006, 10:34 PM
|- - The Messenger   QUOTE (ugordan @ Mar 9 2006, 03:34 PM) Yo...   Mar 10 2006, 06:37 AM
- - Richard Trigaux   Passing at 25 kms of Enceladus would be very inter...   Mar 9 2006, 11:05 PM
|- - DDAVIS   To take images? Wow fantastic images from such an ...   Mar 9 2006, 11:38 PM
- - Sunspot   I think this is the highest resolution image taken...   Mar 9 2006, 11:49 PM
|- - JRehling   QUOTE (Sunspot @ Mar 9 2006, 03:49 PM) I ...   Mar 10 2006, 12:04 AM
- - BruceMoomaw   Unfortunately, as Jason noted back on his own (sor...   Mar 10 2006, 05:01 AM
|- - Richard Trigaux   QUOTE (BruceMoomaw @ Mar 10 2006, 06:01 A...   Mar 10 2006, 08:44 AM
|- - AlexBlackwell   QUOTE (BruceMoomaw @ Mar 10 2006, 05:01 A...   Mar 10 2006, 03:52 PM
|- - EccentricAnomaly   QUOTE (BruceMoomaw @ Mar 9 2006, 09:01 PM...   Mar 10 2006, 05:57 PM
- - gpurcell   If the E-Ring is caused by the venting, why not tr...   Mar 10 2006, 07:13 PM
- - tty   Isnít landing on Enceladus an unnecessarily compli...   Mar 10 2006, 07:24 PM
|- - Richard Trigaux   QUOTE (tty @ Mar 10 2006, 08:24 PM) Isnít...   Mar 10 2006, 07:41 PM
- - BruceMoomaw   QUOTE (AlexBlackwell @ Mar 10 2006, 03:52...   Mar 10 2006, 07:24 PM
|- - AlexBlackwell   QUOTE (BruceMoomaw @ Mar 10 2006, 07:24 P...   Mar 10 2006, 07:44 PM
|- - JRehling   QUOTE (AlexBlackwell @ Mar 10 2006, 11:44...   Mar 10 2006, 08:12 PM
- - volcanopele   a few notes: E3 Imaging: Don't expect super h...   Mar 10 2006, 07:36 PM
|- - AlexBlackwell   QUOTE (volcanopele @ Mar 10 2006, 07:36 P...   Mar 10 2006, 09:34 PM
|- - RGClark   QUOTE (volcanopele @ Mar 10 2006, 07:36 P...   Mar 10 2006, 10:48 PM
|- - RGClark   QUOTE (volcanopele @ Mar 10 2006, 07:36 P...   Mar 11 2006, 03:33 PM
|- - JRehling   One Enceladus mission I could see flying would be ...   Mar 11 2006, 06:58 PM
- - BruceMoomaw   OK. All I can report is what I saw: before Ms. Cl...   Mar 10 2006, 09:16 PM
|- - AlexBlackwell   QUOTE (BruceMoomaw @ Mar 10 2006, 09:16 P...   Mar 10 2006, 10:15 PM
- - BruceMoomaw   QUOTE (AlexBlackwell @ Mar 10 2006, 10:15...   Mar 10 2006, 11:20 PM
|- - AlexBlackwell   QUOTE (BruceMoomaw @ Mar 10 2006, 11:20 P...   Mar 10 2006, 11:51 PM
|- - helvick   QUOTE (AlexBlackwell @ Mar 10 2006, 11:51...   Mar 11 2006, 01:54 AM
|- - AlexBlackwell   QUOTE (helvick @ Mar 11 2006, 01:54 AM) I...   Mar 11 2006, 02:00 AM
- - BruceMoomaw   Fine -- especially since the whole damn thing was ...   Mar 11 2006, 02:50 AM
- - BruceMoomaw   I found Jason's blog entry from almost a year ...   Mar 11 2006, 11:19 AM
|- - EccentricAnomaly   QUOTE (BruceMoomaw @ Mar 11 2006, 03:19 A...   Mar 11 2006, 06:01 PM
- - BruceMoomaw   The NEP idea -- which would orbit Saturn and fly t...   Mar 11 2006, 10:53 PM
- - BruceMoomaw   QUOTE (EccentricAnomaly @ Mar 11 2006, 06...   Mar 12 2006, 11:30 PM
|- - volcanopele   QUOTE (BruceMoomaw @ Mar 12 2006, 04:30 P...   Mar 13 2006, 02:46 AM
|- - ugordan   QUOTE (BruceMoomaw @ Mar 13 2006, 12:30 A...   Mar 13 2006, 08:38 AM
- - volcanopele   The planetary society Cassini tour page now has th...   Mar 15 2006, 10:06 PM
|- - AlexBlackwell   QUOTE (volcanopele @ Mar 15 2006, 10:06 P...   Mar 15 2006, 10:19 PM
- - AlexBlackwell   I just read the materials in the 060323 Reference ...   Mar 28 2006, 09:26 PM
- - BruceMoomaw   Can you tell us anything more about just what they...   Mar 29 2006, 01:11 AM
- - AlexBlackwell   QUOTE (BruceMoomaw @ Mar 29 2006, 01:11 A...   Mar 29 2006, 06:10 PM


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