Dawn Survey Orbit Phase, First orbital phase |
Dawn Survey Orbit Phase, First orbital phase |
Jul 19 2011, 04:12 AM
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#31
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Member Group: Members Posts: 903 Joined: 30-January 05 Member No.: 162 |
Love the "asteroid size comparison poster", amazing to see all the suspects in a police lineup style poster, and LOL, I gets my 1 pixel Itakowa comparison!
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Jul 19 2011, 04:34 AM
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#32
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Member Group: Members Posts: 316 Joined: 1-October 06 Member No.: 1206 |
I can't wait to see...errrr...the antipode of that crater! Mega chaotic terrain?
P |
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Jul 19 2011, 04:36 AM
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#33
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Member Group: Members Posts: 716 Joined: 3-January 08 Member No.: 3995 |
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Jul 19 2011, 10:15 AM
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#34
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Member Group: Members Posts: 716 Joined: 3-January 08 Member No.: 3995 |
A little bit of Vesta on Mars?:
[attachment=24854:MarsRA_sm.jpg] And on Earth?: [attachment=24855:eastspringcomp.png] (Double Spring landslide complex, Oregon) I had a heck of a time finding a decent example of a terrestrial landslide to compare to Vesta. If the grooved terrain is indeed a system of debris flows, they may turn out to be the finest example of the process anywhere in the Solar System. |
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Jul 19 2011, 11:17 AM
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#35
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
I was intrigued by the quick look Cassini got at the conical craters of Saturn's Phoebe. Now it looks like we'll get a much better look at the same sort of crater on Vesta. The images below are very roughly to the same scale. Although Vesta is a little more than twice the diameter of phoebe, the craters in question seem to be about the same size on both bodies.
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Jul 19 2011, 11:35 AM
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#36
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Senior Member Group: Members Posts: 2173 Joined: 28-December 04 From: Florida, USA Member No.: 132 |
For somewhat not geologically-minded, what is reminding all of you about Miranda? I don't see the similarities really... From The Planetary Society Blog: "The interior of that south polar basin sure looks weird. All around the central peak are chevron-shaped ridgy features that bring to mind Miranda -- which, by the way, is very similar in size to Vesta." |
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Jul 19 2011, 12:37 PM
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#37
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Member Group: Members Posts: 293 Joined: 29-August 06 From: Columbia, MD Member No.: 1083 |
From The Planetary Society Blog: "The interior of that south polar basin sure looks weird. All around the central peak are chevron-shaped ridgy features that bring to mind Miranda -- which, by the way, is very similar in size to Vesta." Yeah...I guess I can see that. To me (again, not a geologist), it just all looks like grooves similar to those on other small bodies like Phobos and Lutetia. |
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Jul 19 2011, 01:22 PM
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#38
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Junior Member Group: Members Posts: 52 Joined: 16-November 06 Member No.: 1364 |
OK this is making me absolutely crazy. Another image release (yay!) but as with all the previous image releases the reported scale is wrong. They keep reporting the pixel scale for the original, unenlarged image, and then they post an image that has been enlarged (badly) by some non-integer factor and fail to divide the pixel scale by whatever their enlargement factor was. The last few images were enlarged by an integer factor. Did you find something wrong with how they were enlarged? While the quoted pixel scale is indeed not valid for the enlarged image, it is the relevant number for knowing the smallest detail that can be resolved. |
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Jul 19 2011, 01:31 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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Jul 19 2011, 01:36 PM
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#40
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Junior Member Group: Members Posts: 52 Joined: 16-November 06 Member No.: 1364 |
Congrats to the Dawn team for a successful orbit insertion! Now looking forward to a color image of Vesta... There is a false color image on the MPS Dawn page (click the latest headline). |
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Jul 19 2011, 02:00 PM
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#41
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Forum Contributor Group: Members Posts: 1374 Joined: 8-February 04 From: North East Florida, USA. Member No.: 11 |
The focus is getting better.
The Clangers definetly live there. |
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Jul 19 2011, 02:08 PM
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#42
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Member Group: Members Posts: 291 Joined: 29-December 05 From: Ottawa, ON Member No.: 624 |
The south polar crater is, by appearances, a flat slice right across the south pole. However, gravity is always pulling towards the center of the body. So on the outer limits of this flat massive basin, it is gravitationally speaking, an up hill slope. This would naturally draw the loose surface material towards the center of the crater, and perhaps create the cracks and rifts, would it not?
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Jul 19 2011, 02:37 PM
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#43
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Member Group: Members Posts: 656 Joined: 20-April 05 From: League City, Texas Member No.: 285 |
Was arrival facing the south polar crater planned, or a coincidence of orbital mechanics and intent to enter a polar orbit? I understand that it is a target of interest, just wondering about the extent of the planning process in that regard.
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Jul 19 2011, 03:03 PM
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#44
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Coordinated views of the normal and contrast-enhanced IR composite of 4 Vesta
(lineup is approximate) note the 4-pack of craters to the N in both images. -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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Jul 19 2011, 03:11 PM
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#45
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Solar System Cartographer Group: Members Posts: 10227 Joined: 5-April 05 From: Canada Member No.: 227 |
Nice one, Mike.
The orange spot in the false color view coincides with the darker spot seen in distant views, including the 'crater with tails' as someone described it, on the edge of the smooth patch we saw a while ago. 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 PDF: 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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