Cape York - Shoemaker Ridge and the NE traverse, Starting sol 2735 |
Cape York - Shoemaker Ridge and the NE traverse, Starting sol 2735 |
Oct 4 2011, 12:20 PM
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The Poet Dude Group: Moderator Posts: 5551 Joined: 15-March 04 From: Kendal, Cumbria, UK Member No.: 60 |
Oppy's next destination - the Shoemaker Ridge...
(3D version here http://roadtoendeavour.files.wordpress.com/2011/10/sr-3d.jpg ) Some more height...surrounded by lots of gorgeous rocks...view right across Endeavour... our first view too, probably, of the Promised Land in the centre of Cape York where the phylosillicates are waiting to be found... Go get 'em, Oppy! Edit: looks like Oppy's on the move... http://qt.exploratorium.edu/mars/opportuni...84P1211L0M1.JPG -------------------- |
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Oct 29 2011, 01:01 AM
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Senior Member Group: Members Posts: 4252 Joined: 17-January 05 Member No.: 152 |
Yeah, I think "north component of slope" is vague. What Andy talked about is probably the best way to go without going overboard. His expression gives the angle between rover normal and noon midwinter sun (I've checked!). Andy: how did you get a "sol" angle of 90 - 57 = 33 degrees? I get sol = Mars tilt, 25 degrees + |rover latitude|, 2 degrees = 27 degrees.
Anyway, this is probably pretty crude, for a bunch of reasons. It treats deviations from the "sol" direction equally whether they're east-west or up-down. It pretends the Sun is stuck at solstice, when it's actually higher before and after. Etc etc. But to do better you'd need a good model to work out the solar power versus angles - that's a job for the jpl guys. |
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Oct 30 2011, 10:12 AM
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Member Group: Members Posts: 593 Joined: 20-April 05 Member No.: 279 |
Andy: how did you get a "sol" angle of 90 - 57 = 33 degrees? I get sol = Mars tilt, 25 degrees + |rover latitude|, 2 degrees = 27 degrees. Doh! You're quite correct. I was fiddlin' with my vector maths and googled (what I thought was) Opportunity's latitude. It turns out the result I acquired ("eight degrees south") was the centre of an orbital photo of the landing site! I shall naturally go and kick myself. (Maybe not too hard though, since 6 degrees is still within a percent of max insolation: and the ground truth from the surface compared to the DEM will cover this sort of error and more! <coughs>) Andy, suitably admonished |
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