Dawn's first orbit, including RC3, March 6, 2015- June 15, 2015 |
Dawn's first orbit, including RC3, March 6, 2015- June 15, 2015 |
Jun 10 2015, 01:45 PM
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#421
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Junior Member Group: Members Posts: 65 Joined: 19-November 14 From: Milan, Italy Member No.: 7340 |
New image of the bright spots on June 6th, from 4400 km!
http://dawn.jpl.nasa.gov/multimedia/images...tml?id=PIA19568 |
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Jun 10 2015, 01:56 PM
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#422
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Member Group: Members Posts: 423 Joined: 13-November 14 From: Norway Member No.: 7310 |
Also in the release is, among other things, a nice mosaic of one of the two big craters in the southern hemisphere. These scratch marks north (?) of it have an interesting appearance:
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Jun 10 2015, 01:58 PM
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#423
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Junior Member Group: Members Posts: 66 Joined: 3-August 12 Member No.: 6454 |
New image of the bright spots on June 6th, from 4400 km! http://dawn.jpl.nasa.gov/multimedia/images...tml?id=PIA19568 With the image darkened a little, it looks as though some internal structure begins to appear in the white spots..... |
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Jun 10 2015, 02:06 PM
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#424
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Senior Member Group: Moderator Posts: 3233 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
Those look like compression artifacts to me. I think the "Spot 5" bright spots are still saturated in the released images.
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Jun 10 2015, 03:08 PM
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#425
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
[Maybe the last few posts should be in a new thread?]
Does anyone know if there are plans to target the white spots with shorter exposures from this second mapping orbit? |
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Jun 10 2015, 03:18 PM
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#426
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Member Group: Members Posts: 112 Joined: 31-January 15 From: Houston, TX USA Member No.: 7390 |
Those look like compression artifacts to me. I think the "Spot 5" bright spots are still saturated in the released images. Lots of compression artifacts when zoomed in. Below is a 4x view of white spot 5 with very little processing from the original. The dark streak to the east and attached to the main bright area, heading southeast, is interesting. I don't think that is a processing artifact. I have to agree that almost none of the bright area is resolved even in this view. However, it almost looks to me that the main bright area is a mound covered by bright material. But that is certainly more imagination than analysis. Andy |
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Jun 10 2015, 04:10 PM
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#427
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Junior Member Group: Members Posts: 65 Joined: 19-November 14 From: Milan, Italy Member No.: 7340 |
I'm not a photographic expert, could they try taking photographs at a shorter exposure time in order to maybe resolve some internal structure/features inside the spots?
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Jun 10 2015, 04:17 PM
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#428
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
shouldn't we start a new thread? the latest picture has been taken in the survey orbit
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Jun 10 2015, 04:25 PM
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#429
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Solar System Cartographer Group: Members Posts: 10182 Joined: 5-April 05 From: Canada Member No.: 227 |
"I'm not a photographic expert, could they try taking photographs at a shorter exposure time in order to maybe resolve some internal structure/features inside the spots?"
I'm sure they have done so. The good images are just not released yet. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf 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 10 2015, 05:03 PM
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#430
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Senior Member Group: Members Posts: 4250 Joined: 17-January 05 Member No.: 152 |
I don't know what the bit depth of the original raw images is, but likely more detail is visible in the bright spots in the original images compared to the press release 8bit/pix images. It's been a while since we've heard if the bright spots are still saturated.
The dark streak to the east and attached to the main bright area, heading southeast, is interesting. I don't think that is a processing artifact. I think the dark streak is a slope directed away from the sun. It looks like it may be part of the boundary of a large collapsed (?) region (arrowed in my image below) inside the main crater. If I'm seeing that correctly, it'd be a good guess that the depression has something to do with the bright spots... |
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Jun 10 2015, 05:05 PM
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#431
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Junior Member Group: Members Posts: 65 Joined: 19-November 14 From: Milan, Italy Member No.: 7340 |
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Jun 10 2015, 05:39 PM
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#432
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Member Group: Members Posts: 714 Joined: 3-January 08 Member No.: 3995 |
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Jun 10 2015, 07:04 PM
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#433
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Member Group: Members Posts: 714 Joined: 3-January 08 Member No.: 3995 |
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Jun 10 2015, 08:12 PM
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#434
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
The dark streak to the east and attached to the main bright area, heading southeast, is interesting. I don't think that is a processing artifact. Yeah -- the dark streak appears to be a shadow cast by a ridge of some type, as the sun is coming from the bottom of the image. In addition, the extreme blow-up, while rife with compression artifacts, does show that the uppermost of the small white spots is also casting a shadow in the proper direction. It's the only one of the white spots that shows a shadow above it, although that might be more because the reflections are saturating the pixels so much that the shadows from the larger spots are being wiped out. I'm tempted to think that the fragmentation of the main, central-peak-like white spot along its edges is real, though the details are rather wiped out by the jpeg artifacts. Two tongue-in-cheek things that occur to me, looking at the zoomed-in image: 1) The secondary white spots look like a long quonset-style building, with smaller outbuildings arranged around it... 2) The main spot looks like the saucer section of a Constitution-class starship, with the longer piece representing the engineering hull. Not much left of the nacelles, just a few small pieces, so they must have blown apart upon impact... JUST KIDDING! But, hey, with the jpeg artifacts, you can almost convince yourself that you're seeing a regular structure in the high-albedo parts of the image, just as if they were artificial. And obviously, the scale is all wrong for these things to be anything but natural formations. Gonna be really, really interesting to see these features at higher resolution. -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Jun 11 2015, 01:40 AM
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#435
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Junior Member Group: Members Posts: 27 Joined: 2-December 14 Member No.: 7359 |
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