Winter Quarters, at Low Ridge Haven |
Winter Quarters, at Low Ridge Haven |
Apr 14 2006, 02:00 AM
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#1
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Member Group: Members Posts: 166 Joined: 20-September 05 From: North Texas Member No.: 503 |
Since Spirit is no longer "Running for the Hills" and it appears that she will be staying at Low Ridge Haven for the next eight months or so, it seems like a good time to start a new topic.
I thought we could start with the great panorama stitched by jvandriel, and then altered by Tesheiner. We are going to become very familiar with this view in the coming months. David [attachment=5107:attachment] (286k) |
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Apr 21 2006, 11:08 AM
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#2
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
They seems to have corrected that sequence name. It's now written as McMurdo on the tracking web.
BTW, the second row (of 27?) in that sequence is planned for sol 817 (tosol). CODE 817 p2281.05 52 0 0 52 2 106 pancam_McMurdo_pan_col_2_L234567Rall Slow pace on both sides of Mars. |
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Apr 21 2006, 07:22 PM
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#3
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Senior Member Group: Members Posts: 1229 Joined: 24-December 05 From: The blue one in between the yellow and red ones. Member No.: 618 |
They seems to have corrected that sequence name. It's now written as McMurdo on the tracking web. That's a relief. For a moment I was afraid that global warming had forced a name change. QUOTE Individually, the shorter wavelengths will typically render darker areas brighter than they are while the longer (L/R2 for instance), like Slinted states will render the dark areas dark -or rather less reflective than they actually are under Martian lighting. The discussion by Nix et al. about the albedo variations of Eldorado is one we have touched upon repeatedly in past months. I have tried to contribute my understanding of how incident light is reflected, trapped and scattered by bodies of well-sorted and rounded basaltic sand on Mars. I'm sure that wavelength selectivity of different Pancam images will contribute to how bright or dark the sand looks in an image; ('bluish' sand will look 'blackish' through a red filter). But much of the variation also occurs in Navcam views, with unvarying wavelength biases. These variations conform to a fairly simple dictum: The closer the incident angle of illumination matches the viewing angle, the darker the sand will appear. Orbital midday pictures of Eldorado (and most Martian sand dunes) look black because both light and viewing are from above. From Spirit's present location on the surface of Mars, Eldorado looks bright because there is roughly 90 degrees between illumination and viewing angles, regardless of time of day. From the summit of Husband Hill we were looking down on Eldorado, the angle difference was usually less than 90, and Eldorado looked dark. The basaltic sands of Mars reflect back very little light; they scatter more to the sides; they absorb and trap a lot. I hope this is helpful. -------------------- My Grandpa goes to Mars every day and all I get are these lousy T-shirts!
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