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New Horizons at Io
siravan
post Feb 27 2007, 06:07 PM
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Hi eveyone. This is my first post to UMSF. Here is my take on "plume finding" on Io.
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Exploitcorporati...
post Feb 27 2007, 06:07 PM
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I thought I saw one on the center limb. Didn't realize that the Tvashtar plume was clearly visible in your pic.


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john_s
post Feb 27 2007, 06:11 PM
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Good eyes, exploitcorporations! There is a very small plume on the center limb (around 9 o'clock)- that's Prometheus.

John.
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Bjorn Jonsson
post Feb 27 2007, 06:14 PM
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That's spectacular and one can even easily discern the plume's umbrella-like shape. This is not a surprise because with extreme contrast enhancement plumes are visible in some of the low-phase Voyager 1 clear filter images of Io (for example C1636826.IMQ) despite Voyager 1's more primitive camera.

Makes me wonder what the Voyager 1 Jupiter encounter would have been like had the Internet and powerful computers been common back then and if the image release policy was MER/Cassini/NH-like. One thing is certain: The plumes would have been discovered *before* the Io flyby.
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JRehling
post Feb 27 2007, 06:14 PM
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QUOTE (john_s @ Feb 27 2007, 10:11 AM) *
Good eyes, exploitcorporations! There is a very small plume on the center limb (around 9 o'clock)- that's Prometheus.

John.


I see the small one at 9 o'clock, the large hazy one at 11 o'clock, and two small features around 2 o'clock which are either big mountains peeking over the limb or smaller forelit plumes.
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Exploitcorporati...
post Feb 27 2007, 06:16 PM
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Are those a couple on the terminator, too?

Attached Image


edit...sorry, I keep getting out of sequence. kabooom.


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john_s
post Feb 27 2007, 06:17 PM
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Nope, those are mountains on the terminator
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Bjorn Jonsson
post Feb 27 2007, 06:19 PM
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Knowing the viewing and lighting geometry or the *exact* time the image was obtained would be lovely - then I could make a hi-res computer rendering to check what these features near the terminator are...

EDIT: Didn't see John's reply (these are mountains) before I wrote this.
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siravan
post Feb 27 2007, 06:20 PM
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Here is the plume image.
Attached thumbnail(s)
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volcanopele
post Feb 27 2007, 06:24 PM
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Note the double ring around Masubi!

GREAT IMAGES, john_s!!!! This is such a good day, for other spacecraft images as well...


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DEChengst
post Feb 27 2007, 06:25 PM
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Great pics, thanks for putting them up so quickly. Hoping for more the coming days wink.gif

Quick question for John about the lecture you'll be giving tomorrow:

Will it be recorded and put on the web ?


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Exploitcorporati...
post Feb 27 2007, 06:27 PM
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Those mountains look from the map like they might be part of the big complex to the east and northeast of Ukko Patera about 10W 40N.


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ugordan
post Feb 27 2007, 06:29 PM
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Great catch on the 9 c'clock plume, Exploitcorporations! I wrote it off as scattered light/topography, but a little sharpening brings out the nebulosity of the feature nicely.
Attached Image


Bjorn, we already know the time when the image was taken: 2007-02-26 08:40:04 UTC


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remcook
post Feb 27 2007, 06:33 PM
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sorry, but I have to add another wow! happy days smile.gif
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john_s
post Feb 27 2007, 06:38 PM
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QUOTE (DEChengst @ Feb 27 2007, 06:25 PM) *
Quick question for John about the lecture you'll be giving tomorrow:
Will it be recorded and put on the web ?


Apparently slooh.com will be trying to do something to broadcast it- they have a 7-day free trial membership.

And siravan's image was interesting, showing the plume in the short-exposure image- I hadn't noticed it in that frame, having concentrated on the long exposure frame. And ugordan's view of Prometheus is better than anything I'd come up with so far. Nice stuff!

John.
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