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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.

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.

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).

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

Note:
You use the information on your own risk! There can always be a mistake in my equations behind the calculations, check that the result is correct. Let me know if you find something wrong and I try to correct it. Some calculations are very simple done and not correct in the small details.

### 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
R/V
V-R, linear relation = Calculated results
R/V
V-V, visual reference = 1.00
V/V
B-V, linear relation = Calculated results
B/V
 Note: