HAMO, (aka High Altitude Mapping Orbit) |
HAMO, (aka High Altitude Mapping Orbit) |
Sep 29 2011, 10:02 PM
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#61
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Member Group: Members Posts: 753 Joined: 23-October 04 From: Greensboro, NC USA Member No.: 103 |
My total ignorance of geology is showing, but I could imagine a scenario in which the southern basin impact partially melted the entire surface of Vesta, with the asteroid "ringing" seismically for a while afterward. The concentric grooves in Phil's polar projection remind me of waves that froze as the surface cools.
Again, I am not a geologist...just relaying the impression that I get from that projection. -------------------- Jonathan Ward
Manning the LCC at http://www.apollolaunchcontrol.com |
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Sep 30 2011, 12:10 AM
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#62
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Junior Member Group: Members Posts: 30 Joined: 5-September 07 From: High Bridge, New Jersey, USA Member No.: 3669 |
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Sep 30 2011, 04:08 PM
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#63
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Member Group: Members Posts: 259 Joined: 23-January 05 From: Seattle, WA Member No.: 156 |
My total ignorance of geology is showing, but I could imagine a scenario in which the southern basin impact partially melted the entire surface of Vesta... (snip) Two things: 1) a good deal of the ejecta from the impact might have been molten, so you wouldn't need to melt the whole surface. Just melt some of it and then spray it all over the place. 2) You don't necessarily need anything molten. Seismic shaking from an impact that large on a body that small would be huge. Get some nice resonances going, pile a bunch of fresh ejecta on it, and poof! Troughs and ridges. Sound waves frozen in stone. |
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Sep 30 2011, 04:23 PM
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#64
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Two new stereoscopic images from my blog:
South polar mountain - crosseye pair, anaglyph and blog entry. -------------------- |
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Oct 1 2011, 12:57 PM
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#65
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
-------------------- I always think before posting! - Marco -
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Oct 1 2011, 01:06 PM
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#66
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Member Group: Members Posts: 314 Joined: 1-October 06 Member No.: 1206 |
Wow, what an extraordinary structure that has turned out to be!
P |
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Oct 2 2011, 12:47 AM
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#67
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Senior Member Group: Members Posts: 1414 Joined: 26-July 08 Member No.: 4270 |
Is this the first image from HAMO?
Looks splendid either way! -------------------- -- Hungry4info (Sirius_Alpha)
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Oct 2 2011, 01:48 AM
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#68
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Senior Member Group: Moderator Posts: 3226 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
This image was released yesterday:
http://dawn.jpl.nasa.gov/multimedia/dawn_v...pping_orbit.asp It has a slightly lower pixel scale at 65 meters per pixel. -------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Oct 2 2011, 06:53 AM
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#69
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Indeed, while yesterday's published image was snapped on Sept,17 from 750km height (based on resolution and according to simulator data), the Volcanopele highlighted one was probably taken the following day, when Dawn reached nominal HAMO height, slightly below 700 km.
-------------------- I always think before posting! - Marco -
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Oct 3 2011, 01:47 PM
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#70
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
One question: do someone knows updated Vesta size after Dawn exploration?
I guess even preliminary estimates are a lot better than Hubble-based figures but, strangely, I cannot find anything else! (obviously, I am referring to average ellipsoidal 3 axes value) -------------------- I always think before posting! - Marco -
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Oct 3 2011, 04:09 PM
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#71
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Member Group: Members Posts: 813 Joined: 29-December 05 From: NE Oh, USA Member No.: 627 |
From the EPSC-DPS Joint Meeting 2011 ..
Media release Dawn at Vesta: Massive mountains, rough surface, and old-young dichotomy in hemispheres http://www.europlanet-eu.org/outreach/inde...2&Itemid=41 "NASA’s Dawn mission, which has been orbiting Vesta since mid-July, has revealed that the asteroid’s southern hemisphere boasts one of the largest mountains in the Solar System. Other results show that Vesta’s surface, viewed at different wavelengths, has striking diversity in its composition particularly around craters. The surface appears to be much rougher than most asteroids in the main asteroid belt. Preliminary results from crater age dates indicate that areas in the southern hemisphere are as young as 1-2 billion years old, much younger than areas in the north. The findings are being presented today at the EPSC-DPS Joint Meeting 2011 in Nantes, France" This brieifing was webcast live at 6:15am Eastern U.S. and I missed the first 30 minutes. Good stuff! Craig |
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Oct 3 2011, 04:59 PM
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#72
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Senior Member Group: Moderator Posts: 3226 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
As mentioned in the press release, several names have been approved by the IAU for features that provide the names for mapping quadrants on Vesta. Here is a map identifying those craters (and one hill) :
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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Oct 3 2011, 05:10 PM
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#73
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
One question: do someone knows updated Vesta size after Dawn exploration? As always, Emily has the answer: http://www.planetary.org/blog/article/00003207/ -------------------- If Occam had heard my theory, things would be very different now.
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Oct 3 2011, 06:16 PM
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#74
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Solar System Cartographer Group: Members Posts: 10129 Joined: 5-April 05 From: Canada Member No.: 227 |
... or part of the answer. She doesn't give the three axes.
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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Oct 3 2011, 08:55 PM
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#75
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Senior Member Group: Members Posts: 2492 Joined: 15-January 05 From: center Italy Member No.: 150 |
Thanks for highlight, ElkGroveDan! And perfect timing, Emily!
Obviously, in the report volume exponent is missed (should be 7,532E+7 cubic km); average radius uncertain should be 850 m. -------------------- I always think before posting! - Marco -
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