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Dawn approaches Vesta, Approach phase, 3 May to 16 July 2011
Greg Hullender
post Jun 24 2011, 04:18 AM
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QUOTE (elakdawalla @ Jun 23 2011, 11:07 AM) *
The Dawn FC's angular resolution is 94 microradians. So if the most recent pictures were taken from 189000 km, then they should have about 18 km resolution, or about 30 pixels north to south on Vesta. Vesta actually measures about 160 pixels in these images, so it's been enlarged substantially, by a factor of 5 or 6.

(Someone please check my arithmetic.)

From the FC Web Site the camera is 5.5 degrees square and 1024 pixels square, so I also get 94 microradians/pixel.

Using 579 km for the diameter and 189,000 km for the distance, I get 3,063 microradians or about 33 pixels.

So, yeah, I get the same answer.


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PDP8E
post Jun 24 2011, 05:21 AM
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Here is my take on the original VESTA approach movie.
I tried to clean it up a bit ...
The magnification is quite large so the individual pixel activations between images causes the big jumps.

Attached Image


I received the 20 original approach images from Framing Camera makers at the Max-Planck-Institut für Sonnensystemforschung
The credit for the originals is: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Cheers


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dilo
post Jun 24 2011, 06:53 AM
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My attempt to make a movie from the 10 frames of Jun,20 after enhancement (sharpening and gamma):
Attached Image

I made also these stereograms (with 5° rotation in order to have vertical rotation axis):
Attached Image
Attached Image

thanks to Emily for original material!


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Phil Stooke
post Jun 24 2011, 09:44 AM
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The motion in these movies reveals the pole location, so it looks as if the approach is from some distance south of the equator, say about 20 degrees south, and the south polar mountain (central peak of the big crater) is inside the limb. A prominent bright crater on the south limb is on or just inside the rim of the big crater.

Phil


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SFJCody
post Jun 24 2011, 10:34 AM
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QUOTE (tedstryk @ Jun 24 2011, 11:43 AM) *
After Ceres, we will have seen the two most massive rocky worlds that we haven't yet seen.


Haumea out in the Kuiper Belt has a pretty high density, higher than Ceres. Now there's a place I'd like to see close up...
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Bjorn Jonsson
post Jun 24 2011, 11:32 AM
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It's starting to look like some of the big craters are rather bright - the albedo seems to vary considerably across the disk. One problem though: The released images may have been contrast stretched and/or filtered. If this is the case the brightness variations might be smaller than these images imply.
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Juramike
post Jun 24 2011, 12:14 PM
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QUOTE (Phil Stooke @ Jun 24 2011, 04:44 AM) *
The motion in these movies reveals the pole location, so it looks as if the approach is from some distance south of the equator, say about 20 degrees south, and the south polar mountain (central peak of the big crater) is inside the limb. A prominent bright crater on the south limb is on or just inside the rim of the big crater.

Phil


Also reveals that the remnant rim of the big south polar crater is very beaten up and pretty subtle. (Obvious by topograpy, but not by albedo). Must've occurred very, very early in Vesta's history? I'll wager that the cratering record inside the south polar crater and outside it is pretty similar.


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Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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machi
post Jun 24 2011, 12:39 PM
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More vintage wine. smile.gif
Slow morph animation from 17.6. and 20.6. images (thanks to Dawn Framing Camera team and Emily for images!).
Youtube version
Attached File(s)
Attached File  Vesta17_20.6.2011.avi ( 926K ) Number of downloads: 306
 


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Greg Hullender
post Jun 24 2011, 05:20 PM
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Also, unless Emily's ready to declare victory, we should try to remember to visit the FC Facebook page and "like" the pictures they're sharing with us.

http://www.facebook.com/#!/dawn.framing.camera

And if you haven't done it, FRIEND the camera and SHARE the camera. It makes a nice statement.


We seem to have stalled out at 230. I've been sharing the pix as they come out, but I think I've maxed out my Dawn-interested friends at this point. Still, I'm surprised we don't have (among us) enough interested people to push that to 1,000.

--Greg
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MizarKey
post Jun 24 2011, 06:41 PM
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Already looks like it's going to be an interesting place. What a great mission!


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Hungry4info
post Jun 24 2011, 07:39 PM
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Regarding the approach movie, can someone explain to me the order of the labeled dates?
...June 08, June 14, June 07(!), June 17, June 20...


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machi
post Jun 24 2011, 07:56 PM
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"can someone explain to me the order of the labeled dates? .....June 14, June 07(!), June 17..."
It's evidently typing error.


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Greg Hullender
post Jun 24 2011, 07:59 PM
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QUOTE (machi @ Jun 24 2011, 11:56 AM) *
It's evidently typing error.

But what were they trying to type?

--Greg
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machi
post Jun 24 2011, 08:03 PM
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June 17. smile.gif


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ups
post Jun 24 2011, 11:04 PM
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I'm just going to sit back and wait for the awesomeness.
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