Getting to 'Big Crater', A little premature speculation |
Getting to 'Big Crater', A little premature speculation |
Sep 21 2006, 11:57 AM
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#1
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Member Group: Members Posts: 813 Joined: 8-February 04 From: Arabia Terra Member No.: 12 |
Opportunity is not quite at Victoria yet, but on the horizon is a tantalising goal for the future- the big eroded crater to the south-east, the rim of which is already visible. This is the first 'large scale' topography of the mission so far. Wouldn't it be great if Opportunity could get to these hills and uncover their secrets?
http://homepage.ntlworld.com/sfjcody2/route_to_big.jpg |
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Sep 22 2006, 12:36 PM
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#2
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Solar System Cartographer Group: Members Posts: 10189 Joined: 5-April 05 From: Canada Member No.: 227 |
SFJCody said "One more reason to be interested in going to this place: the rim of Big Crater (certainly the eastern rim, probably also the western rim, although it's hard to tell at this resolution) is not coated in blueberries- there's no hematite signal there!"
I think that is just a data gap in the hematite colour overlay on the background image. There are others, showing as grey windows in the colour. The rim one appears more prominent because the rim itself is so contrasty. 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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Sep 22 2006, 12:58 PM
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#3
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Member Group: Members Posts: 813 Joined: 8-February 04 From: Arabia Terra Member No.: 12 |
I think that is just a data gap in the hematite colour overlay on the background image. There are others, showing as grey windows in the colour. The rim one appears more prominent because the rim itself is so contrasty. Phil There are data gaps, yes, but most of them appear as linear streaks that have no relation to the surrounding areas. If you look at the three big craters in a row (the eroded one being at the top) you'll see that each one is surrounded by a 'halo' of green-blue (indicating a weak signal) that conforms to the shape of the rim. The smaller middle crater has quite a big 'halo' for its size, and this may be because it has a noticeable ejecta blanket overlying the terrain. It's the same (but more pronounced) with the really big fresh crater to the south west- the crater and the ejecta blanket shows no signal, and the outskirts are green-blue. |
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