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Enceladus August 11, 2008 encounter, Close-up observations of plume vents
Floyd
post Aug 3 2008, 06:54 PM
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Just 8 days until the next Enceladus encounter.

CICLOPS Rev 80 Looking Ahead will appear here soon.

Cassini Enceladus 080EN Mission Description is here now.

We get to fly through the south polar jets again.

-Floyd

[edit] Soon = somtime before encounter rolleyes.gif


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ElkGroveDan
post Aug 3 2008, 07:28 PM
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Yikes they are really going to be diving trough those ice plumes. Makes me wonder if a post encounter view of Saturn might look something like this:


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jmknapp
post Aug 3 2008, 11:20 PM
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QUOTE (ElkGroveDan @ Aug 3 2008, 03:28 PM) *
Yikes they are really going to be diving trough those ice plumes.


I just made an animation of the encounter (60MB MPG file, right-click on image below to download):



It's from the point of view if the ISS narrow-angle camera, using pointing & position info from the SPICE kernels--pretty frenetic panning around at times! For a lot of the approach the camera looks to be pointing out into space--maybe towards where the plumes are located?


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nprev
post Aug 4 2008, 12:35 AM
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Let me be the first to say both "OOO!!!" and "AHHH!"....damn cool!!!!

Doug will probably dislike your chosen background music, but he'll get over it... tongue.gif Really beautiful work, man; absolutely inspiring. Thank you for sharing it with us!


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jasedm
post Aug 4 2008, 09:15 AM
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Joe that's an inspirational piece of work! - many thanks for sharing it with us.
Am I right in concluding that the sequence planners may have allowed for some saturnshine exposures on the outbound leg?
I think the camera pointing into space is a consequence of other instruments being 'prime' during the very closest approach, in order to get other data on the plumes themselves.
Can't wait for the results on this one.
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jmknapp
post Aug 4 2008, 11:16 AM
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QUOTE (jasedm @ Aug 4 2008, 04:15 AM) *
Joe that's an inspirational piece of work! - many thanks for sharing it with us.


My pleasure... and thanks to Cassini for timely updating of the SPICE navigation data, allowing such looks into the future.

QUOTE
Am I right in concluding that the sequence planners may have allowed for some saturnshine exposures on the outbound leg?
I think the camera pointing into space is a consequence of other instruments being 'prime' during the very closest approach, in order to get other data on the plumes themselves.
Can't wait for the results on this one.


Don't know about specific plans. The team does publish such info sometimes in their "science plan" SPICE files, but the current plan, S42, ends on August 11 (hours before the Enceladus flyby mad.gif) and the next plan, S43, hasn't been posted yet. Usually there's a several day gap between the end of one plan and the posting of the next.

Maybe the links Floyd gave in the first post will tell some more, when updated.


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ynyralmaen
post Aug 4 2008, 11:56 AM
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QUOTE (jasedm @ Aug 4 2008, 10:15 AM) *
I think the camera pointing into space is a consequence of other instruments being 'prime' ...


That may well be true, but I suspect it may also be related to the rapid motion of Enceladus across the sky as seen from Cassini during such a low altitude encounter... the spacecraft can't turn quickly enough to track the surface during the entire encounter, so before closest approach, the attitude is set ready to image the south pole, with the remote sensing instruments pointing north. The south pole is then in the field of view as soon as possible, yielding the highest resolution images.
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ilbasso
post Aug 4 2008, 12:27 PM
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I imagine they also want to avoid exposing the camera to a high-speed encounter with particles in the plumes.


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tallbear
post Aug 4 2008, 06:02 PM
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Enceladus is in eclipse from 224-21:42 to 225-00:08 --- T


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jmknapp
post Aug 5 2008, 01:36 PM
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QUOTE (tallbear @ Aug 4 2008, 01:02 PM) *
Enceladus is in eclipse from 224-21:42 to 225-00:08 --- T


Note to self: figure out how to model eclipses sometime. Saturn's oblateness makes it even harder than otherwise.


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Decepticon
post Aug 5 2008, 04:32 PM
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Is there any chance for Saturn Shine imaging during this encounter?
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volcanopele
post Aug 5 2008, 07:08 PM
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There is some chance. But keep in mind that the sub-solar point is pretty close to the sub-Saturn point during the encounter, so areas illuminated by Saturn would also be illuminated by the Sun.

During the eclipse, well, you'd be seeing the same areas we would be seeing immediately before the eclipse starts, at good resolution, in sunlight.


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Floyd
post Aug 6 2008, 12:00 AM
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Link to map of Enceladus encounters on Emily's What's up in the solar system for week of August 4


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jmknapp
post Aug 6 2008, 12:35 AM
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Looking at the planned ISS pointing during the encounter in more detail, it looks like there is a long dwell time on the Cairo tiger stripe, vent 'E':



Any particular reason to concentrate on that one? One interesting thing is that it's exactly on the day/night terminator at the time of the observation (the green square shows the NAC view):



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nprev
post Aug 6 2008, 01:07 AM
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QUOTE (jmknapp @ Aug 5 2008, 05:35 PM) *
Any particular reason to concentrate on that one?


Might've answered your own question in your post. Bet they're looking for some high-phase optical plume pics.


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