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Rev 123 - Dec 18, 2009-Jan 3, 2010 - Prometheus
Elias
post Jan 4 2010, 10:39 PM
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QUOTE
I'm still trying to deal with all these noise hits... darn you charged particles, why do you pain me so?


It could have been much worse... Actually, Cassini data indicate that Saturn's radiation belts are much weaker than any other in our solar system. The moons and the rings material do a very good job in removing lots of this noise source for the images :-)
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Phil Stooke
post Jan 4 2010, 11:35 PM
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I didn't notice anyone else commenting on this - but the Prometheus images show the side opposite the best Voyager view, and north is at the top in the raws.

Phil


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Juramike
post Jan 5 2010, 03:35 AM
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I just love abstract images like this....
Attached Image


I won't claim that these are anywhere close to true color.
Full res of this image on flickr here: http://www.flickr.com/photos/31678681@N07/4246131869/
Another in this sequence here: http://www.flickr.com/photos/31678681@N07/...57622089931268/
Two frame composite: http://www.flickr.com/photos/31678681@N07/4246158737/


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pat
post Jan 8 2010, 04:05 PM
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and we get a repeat performance on Jan 27th, the phase is a lot higher (80-125 deg) while the range is ~ 33-38,000 km.
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elakdawalla
post Jan 8 2010, 05:09 PM
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Sweet! Aren't there a passel of other moons being imaged on the 27th? JPL's space calendar has "Jan 27 - Cassini, Distant Flyby of Telesto, Methone, Pan, Prometheus, Aegaon & Dione"


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jasedm
post Jan 9 2010, 01:25 PM
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Going by information elsewhere on the forum, Cassini passes the following moons at reasonably close distances on 27th January. I have no information as to whether the moons are in eclipse at closest approach, whether imaging is planned, or whether other science activities/downlinks take preference at the time. Pixel values assume imaging bang-on closest approach. I would imagine Dione and Prometheus will be imaged, but smaller 'rocks' probably doubtful.

Pan: 95,233km - 54 pixels in the NAC at closest approach
Prometheus - 30,492km - 546 pixels
Aegaeon - 13,305km - 6 pixels
Methone - 74,527km - 7 pixels
Telesto - 95,643 - 42 pixels
Dione - 46,805km - more than 1 NAC frame

Jase
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ugordan
post Jan 9 2010, 03:01 PM
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QUOTE (jasedm @ Jan 9 2010, 02:25 PM) *
Pan: 95,233km - 54 pixels in the NAC at closest approach
Aegaeon - 13,305km - 6 pixels

These two sound like particularly nice opportunities.


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Antdoghalo
post Jan 10 2010, 08:42 PM
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Anyone wanna improve the Voyager map Phil made with these Cassini images.

And Prometheus has a seemingly smoother surface than its twin Pandora
maybe its because of its larger size causing it to interact more with the F ring.

being on the surface of Prometheus is probably like being in a hailstorm.


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Floyd
post Jan 11 2010, 01:45 AM
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Antdoghalo--Improving on Phil's maps is not a trivial challenge. While many here at UMSF have excellent image manipulation skills, the number with Phil's map making skill is vanishingly small. I would encourage you to work on your own challenge. Maybe after hundreds of hours of map making and manipulation, you can develop into a top flight map maker yourself.


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Phil Stooke
post Jan 11 2010, 01:52 AM
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Well, thanks! But the biggest obstacle is the lack of a proper 3D shape model. With this new data set and the new one in a few weeks, and any others Cassini might provide, we can hope to create a really good shape model in a few years. It would still be possible to play around with some sketch maps even now, though I'm too busy to do much with it.

Phil


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pat
post Jan 13 2010, 06:48 PM
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QUOTE (jasedm @ Jan 9 2010, 01:25 PM) *
Going by information elsewhere on the forum, Cassini passes the following moons at reasonably close distances on 27th January. I have no information as to whether the moons are in eclipse at closest approach, whether imaging is planned, or whether other science activities/downlinks take preference at the time. Pixel values assume imaging bang-on closest approach. I would imagine Dione and Prometheus will be imaged, but smaller 'rocks' probably doubtful.

Pan: 95,233km - 54 pixels in the NAC at closest approach
Prometheus - 30,492km - 546 pixels
Aegaeon - 13,305km - 6 pixels
Methone - 74,527km - 7 pixels
Telesto - 95,643 - 42 pixels
Dione - 46,805km - more than 1 NAC frame

Jase


The moons that will be imaged on Jan 27th are Prometheus and Aegaeon, as part of a single combined Prometheus-Aegaeon- G ring arc observation, and then two separate Dione obs later on in the day.
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volcanopele
post Jan 13 2010, 08:04 PM
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QUOTE (pat @ Jan 13 2010, 11:48 AM) *
The moons that will be imaged on Jan 27th are Prometheus and Aegaeon, as part of a single combined Prometheus-Aegaeon- G ring arc observation, and then two separate Dione obs later on in the day.

Actually there is a dedicated Aegaeon observation before that one, during the ring plane crossing (it's just named funny).


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jasedm
post Jan 13 2010, 10:06 PM
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Oooh! Lots of goodies coming up!! Thanks Pat and VP.
January 27th will be an interesting periapse.
Any Aegaeon obs. will be too distant relative to the tiny moon to reveal any surface details, but we should get an idea of its shape.
The Prometheus pictures should provide coverage which matches the best Pandora data, and the Dione encounter leads in from the moon's nightside- perhaps an opportunity to detect some minimal outgassing if present???

And if that wasn't spoiling us enough, we get a targeted encounter with Mimas on the following revolution approaching to less than 10,000km - a flyby where we finally get to have a good close look at Herschel....

Great times!!
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ugordan
post Jan 28 2010, 01:11 PM
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Wow:

http://saturn.jpl.nasa.gov/photos/raw/rawi...?imageID=211928
http://saturn.jpl.nasa.gov/photos/raw/rawi...?imageID=211933
http://saturn.jpl.nasa.gov/photos/raw/rawi...?imageID=211937

Is that F-ring's shadow draping across it?


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Phil Stooke
post Jan 28 2010, 02:50 PM
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Here's a hint of what's hiding in the shadows...

Phil

Attached Image


Attached Image


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NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain)
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