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Dawn's first orbit, including RC3, March 6, 2015- June 15, 2015
djellison
post Apr 17 2015, 06:01 PM
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QUOTE (mcgyver @ Apr 17 2015, 10:26 AM) *
I can't figure out if bright spot is visible in the animation.


It isn't.
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ZLD
post Apr 17 2015, 09:56 PM
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Im rather curious about these two spots that appear in frame 6 and frame 7. Not necessarily from spot 5 but in the same vicinity. They are somewhat dim and on the left lim.
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JohnVV
post Apr 17 2015, 10:04 PM
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ZLD - your map is upside down

That is the two side by side spots that are at 20 degrees NORTH and 240 degrees longitude and is visible in the added light 3d graphic I posted here of the two recreations that show where it WOULD be IF it was lite

http://www.unmannedspaceflight.com/index.p...st&p=219593


you can see in the first image ( added extra AMBIENT light ) to the 3d rendering
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Gladstoner
post Apr 17 2015, 10:39 PM
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JohnVV, thanks much for the simulations with the grids. They really help to put things into perspective.

Also, have you yet added the grid to the global cylindrical map?
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JohnVV
post Apr 17 2015, 10:51 PM
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the grid is dynamically added in the 3d program i am using .

Ceres's orbit is calculated using the JPL orbit data and Dawn's orbit is also calculated using it's orbital data the same data that the research scientists are using the naif kernels.

As to the map. The map posted is 0 long to 360 long ( 180 in the center ) a grid could be added ? but not really needed this very EARLY map is very low resolution 1024x512 pixels and the poles ARE MISSING.

In comparison the published Vesta map is 48 ppd ( 17,280 X 8,641 ) pixels .
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Habukaz
post Apr 20 2015, 01:59 PM
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Is the dimmest bright spot resolved in the OpNav 7 images? It looks distinctly elongated in all frames where it "glows":





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djellison
post Apr 20 2015, 02:18 PM
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QUOTE (Habukaz @ Apr 20 2015, 06:59 AM) *
Is the dimmest bright spot resolved...


The accompanying press release text clearly states

"The images show the brightest spot and its companion clearly standing out against their darker surroundings......"
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Habukaz
post Apr 20 2015, 03:15 PM
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I don't see how that implies that they are resolved.


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centsworth_II
post Apr 20 2015, 03:17 PM
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QUOTE (Habukaz @ Apr 20 2015, 09:59 AM) *
Is the dimmest bright spot resolved....
Are you asking if the impression that the elongated spot is split up into three parts can be trusted? Looks like it to me, but you know what my opinion's worth! laugh.gif
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Habukaz
post Apr 20 2015, 03:24 PM
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Just noting that it looks like it spans more than one pixel at this resolution (and also that it looks elongated from this vantage point). Looking a bit more closely at the images, it seems almost certain to me that it is resolved; but I haven't seen any relevant comments from the science team.


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JohnVV
post Apr 20 2015, 04:40 PM
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from the tiny gif that is PIA19064

it is looking like the one bright spot at 0 long.( 360 long.) and 42 North

is in fact ejecta from a crater ( i am GUESSING that the OTHER side by side bright spot at 240long and 20 North are ALSO ejecta)

4x enlargements from the 8 bit INDEXED gif
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StarryKnight
post Apr 20 2015, 04:50 PM
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The surface between the craters looks very smooth. The smooth areas between craters may only appear that way because of smaller craters can't be seen due to the low resolution of the current set of images. But, so far, there does not appear to be mountains or ridges between the craters.

Also, when I imagine a generic crater, say on the moon, I think of the surrounding of it sloping up fairly steeply then the surface dropping sharply as you go into the crater. But I don't see much of a rise on the outside edges of the craters. Are these craters really that smooth or does it look like that because the resolution or sun angle in these images? If they are really that slightly sloped on the outside, could it be because of what might be below the surface or



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JohnVV
post Apr 20 2015, 05:15 PM
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do to the fact that Ceres is very high in ices the craters have flat bottoms and are shallow

the one in the crops i posted looks to be on one of the ridges and came in at a very shallow angle

some of the "smoothness "is do to the 4x enlargement and that the original crop was only 128 px on a side ( rather small)

keep in mind that the spacecraft is NOT YET even in a near circular orbit YET
and this set of images is from April 14/15
-- LAST WEEK
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TheAnt
post Apr 20 2015, 06:02 PM
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QUOTE (Habukaz @ Apr 20 2015, 05:24 PM) *
Looking a bit more closely at the images, it seems almost certain to me that it is resolved; but I haven't seen any relevant comments from the science team.


Yes I tend to agree thinking its resolved or nearly so on the first image of the sequence, but on the subsequent images it seem to get saturated and float into adjacent pixel areas -and so larger than it actually is -again


Edit: It's not the first, but frames 8 and 9, the page loaded to slow so I missed the early part of the rotation sequence, but I did separate the images after the post to find out.
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Toma B
post Apr 20 2015, 06:06 PM
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Back and forth animation made using grabbed frames from 20 frame gif.

All 20 frames separated into .png images on Dropbox.


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The scientist does not study nature because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful.
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My "Astrophotos" gallery on flickr...
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