Rosetta - Post Separation Ops at Comet 67P C-G, November 14, 2014 - |
Rosetta - Post Separation Ops at Comet 67P C-G, November 14, 2014 - |
Nov 24 2014, 07:00 PM
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#16
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Member Group: Members Posts: 241 Joined: 22-August 05 From: Stockholm Sweden Member No.: 468 |
The long wait for an OSIRIS color image may be over: https://agu.confex.com/agu/fm14/meetingapp.cgi#Paper/22395 The AGU abstracts are online and full of good stuff, and a very small number of them contain images, including this one. Phil That is one very strange image indeed... the mottling is confined to a broad stripe of the image starting abruptly about 20% in from left and ending about 10% in from the right. It almost looks a little bit like it was added in post. (Scientific DRM?) The "non mottled" areas look much nicer... |
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Nov 24 2014, 07:37 PM
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#17
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Senior Member Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 |
I notice that Rosetta/Philae topics get (so far) about 1500 posts and 300.000 views. Wondering if this beat Curiosity around landing time?
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Nov 24 2014, 08:21 PM
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#18
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Junior Member Group: Members Posts: 25 Joined: 14-March 08 Member No.: 4066 |
Newly published Navcam images of the region, 2.59 m/pixel: http://blogs.esa.int/rosetta/2014/11/24/co...ch-20-november/
ADMIN NOTE: Post moved from Philae topic to correct discussion. |
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Nov 24 2014, 11:09 PM
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#19
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Member Group: Members Posts: 819 Joined: 3-June 04 From: Brittany, France Member No.: 79 |
Very nice animation Mattias, as always
NavCam mosaic taken on 20 November: The shadow of the upper lobe is slightly visible on the coma. -------------------- |
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Nov 25 2014, 04:23 AM
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#20
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
the mottling is confined to a broad stripe of the image starting abruptly about 20% in from left and ending about 10% in from the right. Very obvious if you extract the saturation channel and stretch: Very sharp boundary between mottled area and unmottled to the right. The boundary's clearly unrelated to anything on the comet. |
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Nov 25 2014, 08:37 AM
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#21
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Member Group: Members Posts: 241 Joined: 22-August 05 From: Stockholm Sweden Member No.: 468 |
Yes. And the mottling seems very regular. Like a Perlin noice function...
The parts outside the area are quite nice. One could perhaps work a little on the registration of the images to get less fringing. But you can clearly see the colour of the surface change on the different terrain types. (Especially if you remove the overall red tint) |
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Nov 25 2014, 08:56 AM
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#22
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Member Group: Members Posts: 378 Joined: 21-April 05 From: Portugal Member No.: 347 |
Looks like noise / low resolution data. Perhaps some channels are of much lower resolution.
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Nov 25 2014, 09:03 AM
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#23
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Senior Member Group: Members Posts: 3648 Joined: 1-October 05 From: Croatia Member No.: 523 |
Thing is, looking at the rotational state in each of the rgb components, it's suggestive that the source frames cover the entire body, not a case of a colorized greyscale image at the center. Very odd.
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Nov 25 2014, 12:06 PM
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#24
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
A strongly hue and saturation stretched (hence false-color) version of the colored OSIRIS image:
My overall, somewhat subjective and qualitative impression is, that bluish spots are correlated to holes/depressions, and reddish spots to peaks/hills. I can't say, whether this also means some correlation of hue to activity. From the abstract of the paper I've some hope, that the OSIRIS team might have been able to quantify this presumption. |
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Nov 25 2014, 01:49 PM
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#25
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Member Group: Members Posts: 241 Joined: 22-August 05 From: Stockholm Sweden Member No.: 468 |
My bet is that the image has been intentionally degraded to make sure that it is not used by anyone to do any science.
It is just way to much low frequency noise in the individual channels and there seem to be almost no correlation between surface type and color. The images from OSIRIS we have seen so far are very very nice. there seem to be no noise pattern of any kind in those. If one instead looks at the areas outside the noise stripe one is treated to a much higher quality. |
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Nov 25 2014, 04:51 PM
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#26
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Member Group: Members Posts: 114 Joined: 6-November 05 From: So. Maryland, USA Member No.: 544 |
Is anyone interested in matching up the diagram of probable Philae landing zones with the recent Navcam images showing those parts of the comet?
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Nov 25 2014, 06:33 PM
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#27
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Member Group: Members Posts: 934 Joined: 4-September 06 From: Boston Member No.: 1102 |
The zones are just on the other side of the dark grey ridge. Our point of view is 180 degrees off from what we would need to spot Philae.
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Nov 25 2014, 11:22 PM
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#28
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Member Group: Members Posts: 241 Joined: 22-August 05 From: Stockholm Sweden Member No.: 468 |
Very nice animation Mattias, as always Thank you. I think it is a lot of fun to do. It makes the comet more like a physical object to see it like that. And I get to learn the surface very intimately. I have over 150 surface features that I match over the images. They each have a number. Its strange to have a private toponomy like that. I go: -ooh look there's a nice image of twelve. Now lets see if i cant find seventeen in this picture. nope. At least I can see 119. that's enough for the camera solve... |
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Nov 26 2014, 07:25 PM
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#29
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
The jets are really multiplying now! Also, I think this is the first time the dark side has been visible silhouetted against the background coma - we've seen it before with Halley and Hartley-2 but not here.
http://blogs.esa.int/rosetta/2014/11/26/co...ow-of-the-coma/ 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 26 2014, 09:35 PM
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#30
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Member Group: Members Posts: 267 Joined: 5-February 06 Member No.: 675 |
Just noticed -- actually just realized what I've been seeing for some time -- that the jets are primarily pointing toward the Sun, while a comet's dust and ion tails point away from the Sun. Can Rosetta observe the process by which the trajectory changes as they become tails, or is Rosetta too close to see that effect?
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