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More Moons Around Pluto?
tedstryk
post Nov 3 2005, 07:09 PM
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QUOTE (tasp @ Nov 3 2005, 04:11 PM)
Like in the Jupiter system, due to the resonance of Io, Europa, and Ganymede, certain configurations of the satellites never occur.  Like all three in a straight line on the same side of Jupiter. I was annoyed a little when the mission designers of Voyager II's Uranus flyby stated a particularly appealing configuration of the Uranian moons occured just a few days prior to the earliest possible flyby date that preserved the Neptune option.  Hence the fuzzy picture of Umbriel.

Should be easier for the analysts to examine ~77 days of moon configurations than potentially years worth.
*


Umbriel is an interesting world. But it wasn't worth the loss of Triton and Neptune. Also, no configuration of Uranus's moons in 1986 would be that good. Voyager was approaching like a dart headed straight at a dartboard, so rather than having closest approaches one by one, they were all at once. Also, had they been free of Neptune's constraints, Titania, not Miranda, would have received the close flyby - so they really lucked out!
Here are the best views we got of Umbriel.
Color:


Black and White:



Composite of Wunda (The bright feature at the top):



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Phil Stooke
post Nov 3 2005, 09:26 PM
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Ted's pics of Umbriel are, as ever, excellent. I processed the same images as well, using different methods for mainly cartographic purposes. These are the results:

Attached Image


Attached Image


Phil


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Phil Stooke
post Nov 3 2005, 09:30 PM
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...and here's a mosaic of the entire visible hemisphere in azimuthal equidistant projection.

Phil

Attached Image


Blast! I was just replying to Ted, I didn't notice what thread I was in. This should really be in the historic images thread... oops.


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JRehling
post Nov 3 2005, 09:43 PM
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QUOTE (tasp @ Nov 3 2005, 09:11 AM)
Like in the Jupiter system, due to the resonance of Io, Europa, and Ganymede, certain configurations of the satellites never occur.  Like all three in a straight line on the same side of Jupiter.

Should be easier for the analysts to examine ~77 days of moon configurations than potentially years worth.
*


Good point. A 1:4:6 resonance actually allows 12 configurations (not 4 * 6 = 24) if we assume that the Charon position were fixed (which I suppose it is, barring an exceptional reason for change). When the outermost moon has made 2 laps around Pluto (or the barycenter), the middle moon will have made 3 -- that defines a cycle in twelve Charon revolutions, equaling, yes, 77 days).
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tasp
post Nov 3 2005, 10:34 PM
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I very much appreciate the Umbriel pictures. Maybe we get the NH2 to update the Voyager portfolio. And maybe we don't. Sigh.

Rectified Wunda picture is new to me, interesting feature. Still not evident what happened there, though.
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tedstryk
post Nov 3 2005, 10:45 PM
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QUOTE (tasp @ Nov 3 2005, 10:34 PM)
I very much appreciate the Umbriel pictures.  Maybe we get the NH2 to update the Voyager portfolio.  And maybe we don't.  Sigh.

Rectified Wunda picture is new to me, interesting feature.  Still not evident what happened there, though.
*



It is almost certainly a bright crater rim...the question is WHY it is bright. There is also a bright central peak visible in another crater. I made the image by reprojecting the dataset used to make both images I posted to be from the same angle and at the same scale, and then stacked them. I used a color overlay from the posted image.

Here is a sequence of the best views of Umbriel. I am not at home right now, so I don't have a larger version. However, other than the images I already posted, the images aren't shrunken, so it will serve our purposes!



Phil: I also experimented with processing along the lines you did to bring out topography. The posted view focuses on a natural look. When I am home, I may try processing the same images in a similar way, and then merging the datasets to make a sharper image that brings out topography more.


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Phil Stooke
post Nov 3 2005, 11:15 PM
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Ted, my interests are really in the area of making the most easily interpreted map images, not so much the natural view we would see if we were there. So my stuff can look a bit odd! I'm starting to think about doing more of this stuff...

Phil


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mchan
post Nov 4 2005, 03:25 AM
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QUOTE (tasp @ Nov 3 2005, 03:34 PM)
I very much appreciate the Umbriel pictures.  Maybe we get the NH2 to update the Voyager portfolio.  And maybe we don't.  Sigh.

Rectified Wunda picture is new to me, interesting feature.  Still not evident what happened there, though.
*


NH2 did not get funding.
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tedstryk
post Nov 4 2005, 03:49 AM
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QUOTE (Phil Stooke @ Nov 3 2005, 11:15 PM)
Ted, my interests are really in the area of making the most easily interpreted map images, not so much the natural view we would see if we were there.  So my stuff can look a bit odd!  I'm starting to think about doing more of this stuff...

Phil
*



Here is the result of my attempt to merge the two types of processing.



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tasp
post Nov 4 2005, 04:28 AM
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More good pictures of mysterious Umbriel.

Does anyone have any idea where the pole is?

Or the equator?

When I look at the upper limb, from about 11 o'clock to Wunda, I see a 'ridgy' looking feature. Artifact of processing near the limb, or something more....interesting?

(enlarge picture to see it)

blink.gif
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dvandorn
post Nov 4 2005, 08:26 AM
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The "ridgy" feature becomes clear when you look at Phil's cartographic-purposed image. There is a large, very degraded crater (or, rather, a basin) located right in that area. The ridge-like structure (visible more as an albedo difference farther into Umbriel's disk) is a basin ring.

-the other Doug


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tasp
post Nov 4 2005, 02:37 PM
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QUOTE (dvandorn @ Nov 4 2005, 08:26 AM)
The "ridgy" feature becomes clear when you look at Phil's cartographic-purposed image.  There is a large, very degraded crater (or, rather, a basin) located right in that area.  The ridge-like structure (visible more as an albedo difference farther into Umbriel's disk) is a basin ring.

-the other Doug
*



Thanx, I do see that now. I thought it odd something like that would be unnoticed in this time frame.
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Phil Stooke
post Nov 4 2005, 03:04 PM
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I'm posting more images in the historic images thread...

Phil


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Rob Pinnegar
post Nov 4 2005, 04:05 PM
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QUOTE (Phil Stooke @ Nov 4 2005, 09:04 AM)
I'm posting more imagfes in the historic images thread...

Good idea Phil. We have got a bit off the Pluto topic here.
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tty
post Nov 4 2005, 06:59 PM
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QUOTE (tasp @ Nov 3 2005, 06:11 PM)
Like in the Jupiter system, due to the resonance of Io, Europa, and Ganymede, certain configurations of the satellites never occur.  Like all three in a straight line on the same side of Jupiter.


Hmm... I didn't know that and so apparently didn't Robert Heinlein. The big quake in "Farmer in the sky" happened when all 4 galileans lined up.

tty
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