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Instrument commissioning phase, Beginning final approach to the comet
elakdawalla
post Jun 25 2014, 06:57 PM
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I have high hopes that at least the NAVCAM data will be available on that timeline, and today's release shows it'll be fun to play with. The distant approach phase is much more fun for a comet than it is for an asteroid, for sure!


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elakdawalla
post Jun 26 2014, 03:52 PM
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They released all the frames from that animation as individual JPEGs (Zip file here). I spent a little while trying to make an animation where the background was black and star density nearer constant but couldn't produce anything I was happy with.


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dilo
post Jun 26 2014, 09:56 PM
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Emily, I tried too changing luminosity/contrast but resulting movie, reported below, isn't good... at least, it shows the increasing luminosity of approaching nucleus:
Attached Image

Note: I used only 11 frames and cropped field in order to have a small GIF to upload.


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Gerald
post Jun 27 2014, 01:54 AM
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That's the closest I could get within a few hours:


The gif is reduced to 660 pixels to fit into the 2 MB limit (I think) of imgur.
I've used the average brightness of the images as brightness calibration, after subtracting the minimum brightness (RGB channel-wise) over all images (removes vertical streaky artifacts).
Then I (actually a quick and dirty written piece of software) subtracted the minimum brightness (again each RGB channel) over the thus far processed first 21 images to partially clean the images from camera artifacts. This latter processing step probably reduced the brightness of CG a bit more than intended in the beginning of the sequence, but using all images instead has no noticible cleaning effect at all.
I guess, that the overall dark raw images at the end of the sequence cause the flickering, when using the calibration method sketched above; but I had no better easy-to-implement idea.
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dilo
post Jun 27 2014, 04:52 AM
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Great animation, Gerald! It would be nice to change frames duration in order to have a constant star speed...


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Gerald
post Jun 27 2014, 01:14 PM
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Good idea!
Here versions for roughly 5 ms and 2.5 ms per vertical pixel motion, hence no constant frame rate:

(The 2.5 ms-per-vertical-pixel version may be challenging for some computers.)

Looks like some frames would be missing; those gaps could be filled by interpolated frames, I didn't do so.
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xflare
post Jun 27 2014, 01:16 PM
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Did anyone watch the google hangout?

From here they talk about image release policy. http://youtu.be/Ey0UedaFaMs?t=38m25s

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Phil Stooke
post Jul 1 2014, 12:39 PM
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Getting closer!


Where is Rosetta? On 01 July 2014 Rosetta is 58,557 km from comet 67P/C-G and getting closer.



(ESA: http://sci.esa.int/home/ )

Phil


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Paolo
post Jul 3 2014, 02:30 PM
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first hints of a shape
http://blogs.esa.int/rosetta/2014/07/03/th...ixel-at-a-time/
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dilo
post Jul 3 2014, 03:50 PM
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QUOTE (Paolo @ Jul 3 2014, 02:30 PM) *
first hints of a shape

Processed versions of June, 27 image (de-pixelized through gaussian filter, then false-colors):
Attached Image Attached Image
If my figures are right, based on Osiris Narrow-angle spec (0.0186 mrad/pixel) and on the distance, image resolution is 1.6km/pixel, so the nucleus is probably over-exposed because its true image should measure a couple of pixel while it appears 3 times larger...


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xflare
post Jul 3 2014, 04:03 PM
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hmm based on the public comments here http://www.bbc.co.uk/news/science-environment-28146472 ESA might need to release more images. Although for people with a casual or little interest in the mission, an occasional image each week is probably sufficient. huh.gif
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Paolo
post Jul 3 2014, 04:14 PM
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from http://blogs.esa.int/rosetta/2014/06/25/co...igation-camera/

QUOTE
we plan to share more NAVCAM images with you as we get closer to the comet. Because NAVCAM and the OSIRIS wide-angle camera have comparable resolution, we have an agreement with the OSIRIS team to try and avoid publishing too much NAVCAM data immediately, as they could be used to yield science data similar to that coming from OSIRIS. All Rosetta science instrument data have a proprietary period of 6 months, after which they will be publicly available in our archives, and thus all NAVCAM data will also be available no later than that.


I have a bad feeling about this... I think we are going to see another wave of "why they don't share all their images in real time" like we last saw in December for Chang'e 3.
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Ron Hobbs
post Jul 8 2014, 04:24 PM
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This is neat image from the Rosetta folks. One of the things I like to do in my outreach talks is give a sense of scale. This is an informative graphic in that regard.

It really is a flying mountain of ice and dust.



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Bjorn Jonsson
post Jul 10 2014, 01:25 PM
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New images obtained on July 4:

http://blogs.esa.int/rosetta/2014/07/10/th...rosettas-comet/

The comet's shape is starting to become apparent. Not unexpectedly, it's at least a bit irregular. Referring to the end of the text in the above link, I get the impression that it is more round/lumpy than long/skinny but I'd really like to know the phase angle in these images.
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dilo
post Jul 10 2014, 02:01 PM
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Thanks Bjorn for highlight.
Here below my processed version with gaussian de-pixelization and false-color coding... to me, it appear a tri-lobate shape (vaguely recalling a water molecule!) but we need to go a little bit closer to be sure.
Attached Image


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