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Astronomy Calculations:
Magnitude relations

With this tool you can find the linear relations between two different magnitudes. It could be used to:

  • Calculate the linear relations between two different magnitude stars.

    More to read about magnitude:
    Magnitude, Wiki

  • Calculate the distance to a star from its apparent and absolute magnitude. Absolute magnitude is the magnitude a star would have if it were at the distance of 10 Parsec.

    More to read about absolute magnitude:
    Absolute magnitude, Wiki

  • B-V and V-R color index linear relations. Can be used for color calibration. As a very rough estimate, us the color index to calibrate the R/G and B/G relation (use green as visual).

    More to read about color index:
    Color Index, Wiki


Type in your data

It start to calculate as soon you change or write new figures in the dark red boxes. Do not exceed the maximum number of characters, delete characters if necessary.

There can always be a mistake in my equations behind the calculations, I try to correct it as soon as I find it wrong.

From magnitude to linear brightness relation between two stars:

Magnitude star 1   Magnitude star 2    
/ = Calculated results
-35.00 to 50.00 m   -35.00 to 50.00 m   ratio

From linear ratio to magnitude difference between two stars:

Linear ratio        
    = Calculated results
0.000001 to 10000000 ratio       magnitude difference

Distance from apparent and absolute magnitudes:

Apparent magnitude   Absolute magnitude    
  = Calculated results
-35.00 to 50.00 m   -35.00 to 50.00 M   Parsec
      = Calculated results
        Light Years

B-V and V-R color index linear relations:

B-V magnitude   V-R magnitude    
-10.00 to 20.00 m   -10.00 to 20.00 m    
Simulation when no V-R, limited to B-V from 0.3 to 0.9 m = Calculated results
V-R, linear relation = Calculated results
V-V, visual reference = 1.00
B-V, linear relation = Calculated results


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