Dawn's first orbit, including RC3, March 6, 2015- June 15, 2015 |
Dawn's first orbit, including RC3, March 6, 2015- June 15, 2015 |
Apr 17 2015, 06:01 PM
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#31
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
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Apr 17 2015, 09:56 PM
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#32
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Member Group: Members Posts: 555 Joined: 27-September 10 Member No.: 5458 |
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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Apr 17 2015, 10:04 PM
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#33
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
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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Apr 17 2015, 10:39 PM
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#34
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Member Group: Members Posts: 716 Joined: 3-January 08 Member No.: 3995 |
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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Apr 17 2015, 10:51 PM
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#35
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
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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Apr 20 2015, 01:59 PM
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#36
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Member Group: Members Posts: 423 Joined: 13-November 14 From: Norway Member No.: 7310 |
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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Apr 20 2015, 02:18 PM
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#37
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Founder Group: Chairman Posts: 14434 Joined: 8-February 04 Member No.: 1 |
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Apr 20 2015, 03:15 PM
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#38
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Member Group: Members Posts: 423 Joined: 13-November 14 From: Norway Member No.: 7310 |
I don't see how that implies that they are resolved.
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Apr 20 2015, 03:17 PM
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#39
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
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Apr 20 2015, 03:24 PM
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#40
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Member Group: Members Posts: 423 Joined: 13-November 14 From: Norway Member No.: 7310 |
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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Apr 20 2015, 04:40 PM
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#41
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
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Apr 20 2015, 04:50 PM
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#42
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Newbie Group: Members Posts: 2 Joined: 11-March 15 Member No.: 7412 |
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 -------------------- In satellite operations, schedules are governed by the laws of physics and bounded by the limits of technology.
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Apr 20 2015, 05:15 PM
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#43
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
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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Apr 20 2015, 06:02 PM
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#44
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Member Group: Members Posts: 495 Joined: 12-February 12 Member No.: 6336 |
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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Apr 20 2015, 06:06 PM
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#45
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Member Group: Members Posts: 648 Joined: 9-May 05 From: Subotica Member No.: 384 |
Back and forth animation made using grabbed frames from 20 frame gif.
All 20 frames separated into .png images on Dropbox. -------------------- 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.
Jules H. Poincare My "Astrophotos" gallery on flickr... |
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