To El Dorado... |
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To El Dorado... |
 Dec 27 2005, 04:09 PM
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#16
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 Member  Group: Members Posts: 648 Joined: 9-May 05 From: Subotica Member No.: 384  |
Quick stich in Autostich....Ultreya, El Dorado whatever...
-------------------- The scientist does not study nature because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful.
Jules H. Poincare My "Astrophotos" gallery on flickr... |
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Dec 27 2005, 09:55 PM
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#17
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Newbie Group: Members Posts: 9 Joined: 19-December 05 Member No.: 611 |
Well, this is looking like it could be plenty fun, this!
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Dec 27 2005, 10:00 PM
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#18
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Member Group: Members Posts: 311 Joined: 31-August 05 From: Florida & Texas, USA Member No.: 482 |
QUOTE (ustrax @ Dec 27 2005, 09:15 AM) Look what is left from the Ultreya cerimonial totem...  http://img.photobucket.com/albums/v352/ustrax/uh.jpg   Wow! The Other Face of Mars!  Nice to see Spirit breaking new ground! |
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Dec 27 2005, 10:25 PM
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#19
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
Parallax measurements for sol 704 and 705 drives give me about 50m on each sol.
BTW, I posted an updated route map on its respective thread. |
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| Guest_Oersted_* |
Dec 27 2005, 11:52 PM
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#20
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Guests |
Maybe the team is hoping for a cleaning event near El Dorado, could be a golden opportunity for that, if the dune field is a sign of a windy area. Would it be? Or would it rather be the opposite?
This is my first Spirit-board posting btw, greetings all, I'm a Rover nut from Denmark! |
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Dec 28 2005, 12:38 AM
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#21
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 Senior Member Group: Members Posts: 2488 Joined: 17-April 05 From: Glasgow, Scotland, UK Member No.: 239 |
I suspect that Eldorado will - for reasons of Rover safety - be given a fairly wide berth. It looks rather like the sort of classic rover trap we've seen before, and hardly worth attention if Home Plate (and beyond) is to be reached.
BUT... ...Eldorado *does* provide a great opportunity (oops) for some crater counting. If Gusev has anything like the number of mini-craters which we've seen on the other side of Mars, then it really suggests an aerial origin for the wee holes - and, if not, it suggests that something under the surface is responsible. Eldorado is the first Meridiani-like bit of Gusev we've seen... Bob Shaw -------------------- Remember: Time Flies like the wind - but Fruit Flies like bananas!
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Dec 28 2005, 02:44 AM
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#22
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Member Group: Members Posts: 166 Joined: 20-September 05 From: North Texas Member No.: 503 |
QUOTE (Bob Shaw @ Dec 28 2005, 12:38 AM) I suspect that Eldorado will - for reasons of Rover safety - be given a fairly wide berth. It looks rather like the sort of classic rover trap we've seen before, and hardly worth attention if Home Plate (and beyond) is to be reached. Bob Shaw  It looks to me that there is such a sharp edge to the dune/ripple field, that it should be no problem to drive right up to the first ripple, extend the arm, and examine it closely, without actually placing a wheel into the sand itself. David |
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Dec 28 2005, 03:07 AM
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#23
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 Senior Member Group: Moderator Posts: 3431 Joined: 11-August 04 From: USA Member No.: 98 |
Some Sol 705 anaglyphs:
  
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Dec 28 2005, 08:40 AM
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#24
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 Member Group: Members Posts: 578 Joined: 5-November 04 From: Denmark Member No.: 107 |
QUOTE (Oersted @ Dec 27 2005, 11:52 PM) This is my first Spirit-board posting btw, greetings all, I'm a Rover nut from Denmark! About time we got some more Great Danes in here!  Welcome aboard 
-------------------- "I want to make as many people as possible feel like they are part of this adventure. We are going to give everybody a sense of what exploring the surface of another world is really like"
- Steven Squyres |
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Dec 28 2005, 12:03 PM
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#25
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Member Group: Members Posts: 877 Joined: 7-March 05 From: Switzerland Member No.: 186 |
http://home.shinternet.ch/gp/spirit/2P1885...6-89L456_av.jpg (RGB from sol 701, only brightness increased)
That's really odd. If we have here a gathering place of fine sand particles, why this change in color? Welcome Oersted! 
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Dec 28 2005, 12:08 PM
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#26
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 Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
Yeah -- unlike some of the other dark spots in the orbital imagery, this (and other black-sand deposits like it) truly appear as dark from the surface as they do from orbit.
I would *have* to think that there is some major compositional difference between the dark sands and the surrounding rocks and soils, to account for the dramatically darker appearance. The fact that the dark sand patches seem to be in the wind shadows of the hills *seems* to explain them as dust fall-out from prevailing winds -- but that then begs the question as to why there should be a major compositional difference between the particles that fall out in such conditions and the particles that have been wind-deposited into the surrounding soils. -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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Dec 28 2005, 12:09 PM
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#27
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Founder Group: Chairman Posts: 14432 Joined: 8-February 04 Member No.: 1 |
I dont think it is fine particles. I imagine it is sand, darker basaltic sand. The lighter coloured, beigey dust remaining suspended in the air while darker particles get dropped as the wind stalls over the hill
Doug |
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Dec 28 2005, 12:35 PM
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#28
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Senior Member Group: Members Posts: 1870 Joined: 20-February 05 Member No.: 174 |
There is a lot of really not-understood sorting and mixing processes of "dusts", "sands" and "composit particles" on Mars. The only reasonably well understood material in fact may be the dark sands of places like el Dorito\\\\\\Dorado, because well sorted clean mineral-grain sands are relatively uncomplicated and well understood. Sorting may be both mechanical and electrostatic, grains of dust can aggregate and aggegrates can break up, etc. I simply do not understand a lot of the subtle but complex color variations on soils and rocks due to dust and sands and who-knows that I've been seeing since the first Viking pictures.
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Dec 28 2005, 01:18 PM
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#29
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 Member Group: Members Posts: 809 Joined: 11-March 04 Member No.: 56 |
Is the color-contrast seen at El Dorado similar, though on a smaller scale, to the large-scale albedo differences that have been observed on Mars for centuries? If so, it would be of considerable interest to examine the properties of the darker sand, and -- if Spirit keeps El Dorado in view for some time -- to watch for any changes in its distribution over time.
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Dec 28 2005, 01:21 PM
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#30
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Member Group: Members Posts: 877 Joined: 7-March 05 From: Switzerland Member No.: 186 |
When I have a look at this mosaics from Nico, I get too the impression that this dark sand is a deposit of heavier particels when wind comes (from (north-) west I guess) over the hills and blows down material from them. So the lighter material blows farther than the heavier.
Maybe it's also an electrostatic process that the heavier particles get aggregate together when flying...? -------------------- |
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