[Aavso-photometry] Obtaining Trans. Coeff's, Extinction Coeff's and ZP During Full Moon

[Jeff Hopkins]

Hello Steve,

While dark skies are ideal, I have found even a full moon has little 
effect on photometry unless within a degree or so of the FOV. I find 
this true for both single channel UBV work, JH band work and CCD BVRI 
work. It should be fairly easy to pick a night and Landolt set that 
is near the meridian at a reasonable hour with no close Moon. 
Remember for the color coefficients get an image near the meridian 
and then for the extinction coefficients get images at various air 
masses.

If you are planning on doing BVRI photometry I suggest you do not use 
any other filters other than the standard photometric filters.

Jeff

At 15:11 -0700 08/30/2007, Steven Orlando wrote:
>Hello All!
>
>Can one do an imaging run of a Landolt field through all their 
>photometric filters for the purpose of determining transformation 
>coeff's, extinction coeff's and ZP with the moon up, and get 
>accurate coeffs. The field(s) are constant.
>
>Bruce Gary mentioned to me purchasing a blue-blocker to block 
>moonlight. I don't have one (yet).
>
>Steve

-- 
Jeff Hopkins
HPO SOFT
Counting Photons
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