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Old 21-03-2021, 02:37 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
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JA,
The sky magnitude is an "estimate"
http://www.nightwise.org/magnitudes.htm
http://memebers.ziggo.nl/jhm.vangast...ictionTool.htm


SB0 = 22 - 5Log(10(1.7-LM/5)-1) as suggested by Jan van Gastel, based on the initial formula by Nils Olof

This doesn't cover the calculations for sky noise.....


We need to use a luminance in electrons(photons)/cm^2/s/Angstrom/arcsec
The Planck Black body and Wein temperature formula seem to be used to determine a spectral flux (photons/cm^2/s/A) based on an (agreed?) stellar magnitude and spectral type.
See also:
https://www.researchgate.net/publica..._the_Night_Sky

Ken

Last edited by Merlin66; 21-03-2021 at 02:57 PM.
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