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3
votes
0answers
102 views

Why do dark objects look white from a distance? (Moon, Ceres, but not Earth!)

What makes the Moon shine white in the sky, although it seems to be as dark as asphalt? Earth's average albedo is 3 and 4 times that of the Moon and Ceres respectively (0.37 vs 0.12 and 0.09). But ...
2
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0answers
47 views

need data-point: actual counts per second with APD (avalanche photodiode) detector

I'm designing a sensor system to perform specialized [astronomy and space-sciences] experiments, and need a "reality check" to support or adjust my theoretical calculations. What I need is the ...
-1
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0answers
11 views

How to evaluate limiting magnitude of a telescope

Given that the limiting magnitude of a 5cm telescope is 10, what is the limiting magnitude of a 2.5m telescope? I assume that the limiting magnitude for this problem is a function of light gathering ...