[SQM] NELM

Anthony Tekatch anthony at unihedron.com
Mon Apr 12 14:00:34 UTC 2010


Hello John,

K. Fisher produced this calculation page with formulas:
  http://unihedron.com/projects/darksky/NELM2BCalc.html

Formula: NELM=7.93-5*log(10^(4.316-(Bmpsas/5))+1)


You may find some helpful information about Naked-Eye Limiting Magnitude
here:
  http://en.wikipedia.org/wiki/Naked_eye

Best regards,
Anthony Tekatch

On Mon, 12 Apr 2010 04:23:27 EDT, JPDarkSkies at aol.com wrote:

> The Knightware software used with the SQM-LU offers NELM readings as well  
> as Mag/sq ArcSecs.
> Where can I find a clear definition of NELM, what are the units and is  
> there a conversion formula from Mags to NELM.
>  
> John Prockter



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