IPB

Welcome Guest ( Log In | Register )

Enceladus-3 (March 12, 2008)
Guest_AlexBlackwell_*
post Feb 24 2006, 09:12 PM
Post #1





Guests






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.
Go to the top of the page
 
+Quote Post
 
Start new topic
Replies
Guest_Richard Trigaux_*
post Mar 9 2006, 11:05 PM
Post #2





Guests






Passing at 25 kms of Enceladus would be very interesting for measuring its gravitationnal field, allowing to detect its inner structure. Why 25kms and not 30 or 10? I think it is a matter of accuracy of navigation: not to take a risk to crash on Enceladus (a double catastrophe, if we contaminate a world where our bacterias can undoubtly live) but passing as close at possible to have a better gravitation measurement.


To take images? Wow fantastic images from such an altitude, not much more than an airliner... But probably motion blurred beyond recognition. Unless they develop a special imaging software coupled with a variable tilt of the ship...


To pass into the plume? Not necessary for gravitation measurement. But a bit difficult to avoid, as it takes much place.

Dangerous to pass into the plume? I don't know. Certainly it is not benign, that depends on the size of the snow particules, that we don't know. Measures could tell us that there are many micron-sized particules, but not show a minority of larger ones, for instance soil bits expelled by the vents. Only one snow flake, and it is the end of the mission... In any case, Cassini should pass through the plume antenna ahead, as during the insertion.

The ideal would be to pass just besides the plume, and take images of the vents...
Go to the top of the page
 
+Quote Post
DDAVIS
post Mar 9 2006, 11:38 PM
Post #3


Member
***

Group: Members
Posts: 194
Joined: 8-February 04
Member No.: 10



To take images? Wow fantastic images from such an altitude, not much more than an airliner... But probably motion blurred beyond recognition. Unless they develop a special imaging software coupled with a variable tilt of the ship...


I think they have pretty short shutter speeds available, and if they point the camera either forward or backwards along the spacecraft path the blurring would be minimized, and radial in character. The lighting would be probably better for photography looking one way rather than the other, and a rapid sequence including the closest approach would make a hellova animation.

Don
Go to the top of the page
 
+Quote Post

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   Isn’t landing on Enceladus an unnecessarily compli...   Mar 10 2006, 07:24 PM
|- - Richard Trigaux   QUOTE (tty @ Mar 10 2006, 08:24 PM) Isn’t...   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


Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 31st October 2024 - 11:29 PM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member.