Dawn approaches Vesta, Approach phase, 3 May to 16 July 2011 |
Dawn approaches Vesta, Approach phase, 3 May to 16 July 2011 |
Jun 24 2011, 04:18 AM
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#256
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Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
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. --Greg |
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Jun 24 2011, 05:21 AM
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#257
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Member Group: Members Posts: 807 Joined: 10-October 06 From: Maynard Mass USA Member No.: 1241 |
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. 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 -------------------- CLA CLL
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Jun 24 2011, 06:53 AM
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#258
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
My attempt to make a movie from the 10 frames of Jun,20 after enhancement (sharpening and gamma):
I made also these stereograms (with 5° rotation in order to have vertical rotation axis): thanks to Emily for original material! -------------------- I always think before posting! - Marco -
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Jun 24 2011, 09:44 AM
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#259
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Solar System Cartographer Group: Members Posts: 10131 Joined: 5-April 05 From: Canada Member No.: 227 |
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 -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke 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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Jun 24 2011, 10:34 AM
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#260
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Member Group: Members Posts: 813 Joined: 8-February 04 From: Arabia Terra Member No.: 12 |
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Jun 24 2011, 11:32 AM
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#261
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IMG to PNG GOD Group: Moderator Posts: 2250 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
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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Jun 24 2011, 12:14 PM
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#262
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
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. -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Jun 24 2011, 12:39 PM
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#263
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
More vintage wine.
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)
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Jun 24 2011, 05:20 PM
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#264
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Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
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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Jun 24 2011, 06:41 PM
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#265
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Member Group: Members Posts: 295 Joined: 2-March 04 From: Central California Member No.: 45 |
Already looks like it's going to be an interesting place. What a great mission!
-------------------- Eric P / MizarKey
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Jun 24 2011, 07:39 PM
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#266
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Senior Member Group: Members Posts: 1415 Joined: 26-July 08 Member No.: 4270 |
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... -------------------- -- Hungry4info (Sirius_Alpha)
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Jun 24 2011, 07:56 PM
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#267
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
"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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Jun 24 2011, 07:59 PM
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#268
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Senior Member Group: Members Posts: 1018 Joined: 29-November 05 From: Seattle, WA, USA Member No.: 590 |
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Jun 24 2011, 08:03 PM
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#269
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
June 17.
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Jun 24 2011, 11:04 PM
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#270
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Member Group: Members Posts: 115 Joined: 8-January 05 From: Austin | Texas Member No.: 138 |
I'm just going to sit back and wait for the awesomeness.
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