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Rev 144 - Jan 20-Feb 10, 2011 - Enceladus and Helene, Epimetheus, Calypso, Mimas too
jasedm
post Jan 21 2011, 10:24 AM
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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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charborob
post Jan 24 2011, 01:13 PM
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Nice images a Rhea-Dione mutual event:
http://saturn.jpl.nasa.gov/photos/raw/?sta...storedQ=2315808
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pat
post Jan 25 2011, 12:44 AM
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QUOTE (jasedm @ Jan 21 2011, 11:24 AM) *
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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Frank Crary
post Jan 25 2011, 06:21 AM
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QUOTE (pat @ Jan 25 2011, 12:44 AM) *
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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jasedm
post Jan 25 2011, 07:03 PM
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Perhaps the technique may be used sparingly for high priority targets (e.g. Enceladus) in the coming years.
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ngunn
post Jan 31 2011, 12:47 PM
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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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eoincampbell
post Feb 1 2011, 02:21 AM
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QUOTE
Difficult to pick a winner...


Now THAT'S scientific, artistic splendor...Thanks for bringing it to light...(and shade) smile.gif


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ElkGroveDan
post Feb 1 2011, 05:41 AM
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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)
Attached thumbnail(s)
Attached Image
 


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Ian R
post Feb 1 2011, 03:27 PM
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Helene colour composite (IR-GRN-UV):

Attached Image


Stacked series of shots taken through polarizing and green filters:

Attached Image


The brown 'swirls' are very redolent of similar features seen on Calypso, I seem to recall.


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Ian R
post Feb 1 2011, 04:24 PM
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This enhanced IR-GRN-UV composite of Mimas clearly shows the bluish equatorial 'stain':

Attached Image


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john_s
post Feb 1 2011, 04:30 PM
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Another nice Mimas image showing Herschel in profile on the limb.

John

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ngunn
post Feb 1 2011, 05:01 PM
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Some nice Enceladus ones too: http://saturn.jpl.nasa.gov/multimedia/imag...6/N00167673.jpg

(Great time for a Cassini image feast. smile.gif )
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Ian R
post Feb 1 2011, 05:35 PM
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Enceladus in IR-GRN-UV colour, illuminated by both Sol-shine and Saturn-shine:

Attached Image


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volcanopele
post Feb 1 2011, 06:11 PM
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I'm so happy laugh.gif More pictures of my favorite, small solar system body!

Great work, Ian R.


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Ian R
post Feb 1 2011, 06:11 PM
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Mimas and the rings in IR-CLR-UV colour:

Attached Image


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