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Re: [Phys-l] the Moon



L=luminosity
L1/L2 = 2.512^(m2-m1)
Lmoon/LSirius = 2.512(11.2) = 30000 ... standard film (or CCDs) won't handle the difference. It's pretty amazing that the human eye/brain system can adapt.

-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of Bernard Cleyet
Sent: Wednesday, December 07, 2011 8:36 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] the Moon


On 2011, Dec 07, , at 13:58, Paul Nord wrote:

I suspect that this is because stars are very dim. Check your own
photographs, you don't see stars in very many of those either. If you
have a nice bright foreground object like the lighted surface of the
moon, the earth, or the sun, the stars don't show up.

Paul


Sirius M=~ -1.5

Moon ~ -12.7

m = -2.5 * log (F/Fstand)

bc
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