More Moons Around Pluto? |
More Moons Around Pluto? |
Nov 3 2005, 07:09 PM
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#31
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
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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Nov 3 2005, 09:26 PM
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#32
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
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:
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf 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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Nov 3 2005, 09:30 PM
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#33
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
...and here's a mosaic of the entire visible hemisphere in azimuthal equidistant projection.
Phil 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. -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf 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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Nov 3 2005, 09:43 PM
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#34
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
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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Nov 3 2005, 10:34 PM
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#35
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
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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Nov 3 2005, 10:45 PM
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#36
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
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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Nov 3 2005, 11:15 PM
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#37
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
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 -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf 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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Nov 4 2005, 03:25 AM
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#38
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Member Group: Members Posts: 599 Joined: 26-August 05 Member No.: 476 |
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Nov 4 2005, 03:49 AM
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#39
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Interplanetary Dumpster Diver Group: Admin Posts: 4404 Joined: 17-February 04 From: Powell, TN Member No.: 33 |
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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Nov 4 2005, 04:28 AM
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#40
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
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) |
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Nov 4 2005, 08:26 AM
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#41
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
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 -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Nov 4 2005, 02:37 PM
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#42
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
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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Nov 4 2005, 03:04 PM
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#43
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
I'm posting more images in the historic images thread...
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf 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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Nov 4 2005, 04:05 PM
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#44
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Member Group: Members Posts: 509 Joined: 2-July 05 From: Calgary, Alberta Member No.: 426 |
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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Nov 4 2005, 06:59 PM
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#45
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Member Group: Members Posts: 688 Joined: 20-April 05 From: Sweden Member No.: 273 |
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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