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3D shape, cartography, and geoid of Comet 67P C-G
stevesliva
post Aug 13 2015, 06:13 PM
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http://sci.esa.int/comet-viewer/?model=esa
http://sci.esa.int/comet-viewer/?model=malmer

Neat!
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Explorer1
post Aug 13 2015, 06:57 PM
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I second that; wow! Especially the observations viewing.

Imhotep is misspelled though...
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Habukaz
post Aug 13 2015, 07:24 PM
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Cool that malmer's work was used. I haven't had time to properly check out the feature yet.


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Bill Harris
post Aug 14 2015, 12:05 AM
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So the Philae touch-down point which was initially named Abydos is now named Wosret?

--Bill


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Malmer
post Sep 26 2015, 03:19 PM
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While playing around with map projections for my 67P shapemodel I started playing with different tools for making areapreserving "maplets". When seeing the various pieces they sortof resembled a sewing pattern. So I went ahead and looked for a set of good seam lines that would make as few pieces as possible.

Here is the result:

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PDP8E
post Oct 14 2015, 12:24 AM
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I didn't really know where to put this... but it is very cool... it is Comet 67PC-G compared to Los Angeles!

I ran across it on one of my peregrinations about the internet
It is by an obviously talented image-artist named Matt Wang.

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I find that images like this bring the sizes of objects into a sharp focus - a deeper understanding of what we are seeing

found it here:
http://mentalfloss.com/article/60082/roset...red-los-angeles

Thank you Matt Wang



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chuckclark
post Oct 14 2015, 10:50 AM
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Now THAT's nice!

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SteveM
post Aug 27 2016, 12:54 PM
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A question for the shape modelers: Are their detailed enough observations to detect possible changes in the comet's shape / topography between the period of approach to the Sun and the period of departure? The comet is big and the changes would be small, but are they detectable?

Since things were changing rapidly around perihelion (and Rosetta had to back off for navigation / safety reasons) it seems reasonable to ignore data near perihelion.

Steve M
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Gerald
post Aug 27 2016, 01:07 PM
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By shading and shadows, changes at the surface have been detectable even before perihelion.
But I'm unaware of a synopsis of all significant changes between pre and post perihelion.
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SteveM
post Aug 30 2016, 02:12 PM
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Thanks for the link; changes with "the rims of the features expanding by a few tens of centimetres per hour" should add up to something detectable after a year (even though the changes mentioned were only in daylight).

Maybe one of our experts (Malmer?) could develop a before and after model. Some of the earthquake displacement maps from Italy show what might be done to make such small changes visible over a large area.

Steve M
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JohnVV
post Aug 30 2016, 08:53 PM
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QUOTE
A question for the shape modelers: Are their detailed enough observations to detect possible changes in the comet's shape / topography between the period of approach to the Sun and the period of departure? The comet is big and the changes would be small, but are they detectable?

should be doable BUT i would guess that the changes might be close to the " error bars " and might have to be puled out of the "noise"

i have not tried using stereo pipeline on the released pds data , nor used bundler on the released data for "shape from motion"

so it is only a guess
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SteveM
post Sep 3 2016, 01:47 PM
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This video update from ESA indicates (starting about one minute into the report) that isolated changes on Comet 67P C-G have been measured on the order of several meters and that ESA plans to develop a revised shape model to detect further changes in the comet. It seems they think the project will reveal more widespread changes.

Steve M
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