Rev 144 - Jan 20-Feb 10, 2011 - Enceladus and Helene, Epimetheus, Calypso, Mimas too |
Rev 144 - Jan 20-Feb 10, 2011 - Enceladus and Helene, Epimetheus, Calypso, Mimas too |
Jan 21 2011, 10:24 AM
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#1
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Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
The latest article is available Rev144 .
Lots to look forward to for icy moon/rocks fans (Mimas, Enceladus, Helene and Rhea) I notice that there's a planned search for Mimas Lagrangians too, with constraints on the size of any putative co-orbitals being <50 metres if nothing's spotted in the two observations. My intuition (nothing more) is that it's unlikely anything will be found - I'd like to be wrong though... I hope the Helene observations go as planned (closest-approach is ~28,000km) various reasons have conspired to cause the pointing to be a little off in two of the preceding obs. Helene gets another very close flyby in June this year at ~7000km. I wonder if they'll have another crack with the 'skeet-shooting' technique during that encounter? Jase |
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Jan 24 2011, 01:13 PM
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#2
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Senior Member Group: Members Posts: 1074 Joined: 21-September 07 From: Québec, Canada Member No.: 3908 |
Nice images a Rhea-Dione mutual event:
http://saturn.jpl.nasa.gov/photos/raw/?sta...storedQ=2315808 |
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Jan 25 2011, 12:44 AM
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#3
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Junior Member Group: Members Posts: 76 Joined: 19-October 05 Member No.: 532 |
The latest article is available Rev144 . Helene gets another very close flyby in June this year at ~7000km. I wonder if they'll have another crack with the 'skeet-shooting' technique during that encounter? The flyby is slow enough that Cassini wil be tracking Helene continuously on reaction wheels during approach, flyby and retreat -- no need to skeet shoot, which is just as well because we're not supposed to be doing it any more (too labour intensive) |
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Jan 25 2011, 06:21 AM
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#4
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Newbie Group: Members Posts: 17 Joined: 4-March 10 Member No.: 5240 |
The flyby is slow enough that Cassini wil be tracking Helene continuously on reaction wheels during approach, flyby and retreat -- no need to skeet shoot, which is just as well because we're not supposed to be doing it any more (too labour intensive) Strictly speaking. a skeet shoot isn't automatically labor intensive. This is one of several sorts of observations where the Cassini project has to make a hard choice. Doing a skeet shoot without adding too much work would add wear on the reaction wheels (which is a bad idea, if we want the mission to continue until the end of the Solstice mission in 2017.) Finding a way to do a skeet shoot without adding wear on the reaction wheels is possible, but it would take quite a bit of labor on the part of the spacecraft team, and the extended mission work force can't really support that. |
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Jan 25 2011, 07:03 PM
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#5
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Member Group: Members Posts: 655 Joined: 22-January 06 Member No.: 655 |
Perhaps the technique may be used sparingly for high priority targets (e.g. Enceladus) in the coming years.
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Jan 31 2011, 12:47 PM
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#6
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
Difficult to pick a winner from the latest dramatic sequence of Dione: http://saturn.jpl.nasa.gov/multimedia/imag...6/N00167591.jpg
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Feb 1 2011, 02:21 AM
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#7
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Member Group: Members Posts: 399 Joined: 28-August 07 From: San Francisco Member No.: 3511 |
QUOTE Difficult to pick a winner... Now THAT'S scientific, artistic splendor...Thanks for bringing it to light...(and shade) -------------------- 'She drove until the wheels fell off...'
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Feb 1 2011, 05:41 AM
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#8
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
Here's a rough animation gif using a bit of morphing as well as a couple of synthesized images for the three in the sequence of twelve that were missing.
I'll post a link to a better YouTube animation as soon as it is uploaded. (please bear with me as I get better at this software) -------------------- If Occam had heard my theory, things would be very different now.
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Feb 1 2011, 03:27 PM
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#9
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
Helene colour composite (IR-GRN-UV):
Stacked series of shots taken through polarizing and green filters: The brown 'swirls' are very redolent of similar features seen on Calypso, I seem to recall. -------------------- |
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Feb 1 2011, 04:24 PM
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#10
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 1 2011, 04:30 PM
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#11
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Member Group: Members Posts: 701 Joined: 3-December 04 From: Boulder, Colorado, USA Member No.: 117 |
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Feb 1 2011, 05:01 PM
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#12
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
Some nice Enceladus ones too: http://saturn.jpl.nasa.gov/multimedia/imag...6/N00167673.jpg
(Great time for a Cassini image feast. ) |
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Feb 1 2011, 05:35 PM
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#13
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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Feb 1 2011, 06:11 PM
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#14
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
I'm so happy More pictures of my favorite, small solar system body!
Great work, Ian R. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Feb 1 2011, 06:11 PM
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#15
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Lord Of The Uranian Rings Group: Members Posts: 798 Joined: 18-July 05 From: Plymouth, UK Member No.: 437 |
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