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Naked Eye Limiting Magnitude

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dklinglesmith:
I have a simple python script running for the SQM-LR.  Still need to generate a nightly graph.

How is the Naked Eye Limiting Magnitude calculated?  I did not see it coming back from the instrument.

cheers, Dan Klinglesmith

admin:

--- Quote from: dklinglesmith on November 27, 2014, 04:08:16 am ---I have a simple python script running for the SQM-LR.  Still need to generate a nightly graph.

How is the Naked Eye Limiting Magnitude calculated?  I did not see it coming back from the instrument.

cheers, Dan Klinglesmith

--- End quote ---

Hi Dan,

NELM calculation can be found here:
  http://unihedron.com/projects/darksky/NELM2BCalc.html

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


Or using this chart which also depicts the not so precise conversion to NELM because of differences in human vision:




Cheers,
Anthony

kyba:
Hello Dan,

I just wanted to let you know that if you'd like to share your data with researchers, it is best to store it in the community standard format that we developed two years ago: http://www.darksky.org/night-sky-conservation/248

If you are interested, Kai Pong Tong from Bremen has a Python script to read out an SQM and print the header and information in the standard format that he would be willing to share with you. If you are interested, please send me an email. My contact information is here: http://userpage.fu-berlin.de/~kyba/

Christopher Kyba

dklinglesmith:
thanks for the information and links.

cheers,
Dan Klinglesmith

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