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Jan 6 2006, 08:55 PM
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#101
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
ADMIN NOTE: Please note that this topic was unavoidably poltical before the 'No Politics' rule. Please restrict future comments to the mission/spacecraft/news updates etc.
WHAT'S NEW Robert L. Park Friday, 6 Jan 06 Washington, DC DEEP SPACE CLIMATE OBSERVATORY KILLED. http://bobpark.physics.umd.edu/index.html -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Jan 25 2017, 06:20 PM
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#102
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Senior Member Group: Members Posts: 1669 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
Using my simulated imagery (link 2 posts above) as an example, it seems possible to determine how far the (often obscured solid surface) limb is located below the top of the visible atmosphere. With a non-zero phase angle, the shading effects can also be considered. This is the more significant aspect I think with the visible atmosphere extending perhaps 30-60km above the limb.
Refraction is also of interest as you note. The actual lateral displacement of the limb (and locations nearby) from refraction is only about 1km, smaller than the camera resolution. This small amount can still allow another 100km or so of land to be squeezed into theoretical visibility near the limb. -------------------- Steve [ my home page and planetary maps page ]
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