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  1. Location

    (0.5 degree accuracy is enough):
    , (or get them from Geolocation).
  2. Chart:



    ,

  3. Brightness estimate

    as (A (brightness steps) V (brightness steps) B)
    Bright star steps Variable steps Dim star (+) Add row
  4. For the airmass values above, you should not need to correct for extinction.
  5. Extinction coefficient (K)



    this method):
 

 
Air mass for variable star V is unknown. Without considering extinction, brightness of V is: unknown. Considering extinction, brightness of V is: unknown.