How to calculate the visual magnitude of a star having only the flux of such star?(adsbygoogle = window.adsbygoogle || []).push({});

The equation involves 2 magnitudes and 2 fluxes, corresponding to 2 objects a and b:

m_{a}-m_{b}= -2.5log_{10}[itex]\left( \frac{F_a}{F_b}\right)[/itex]

but I just have F_{a}and I have to obtain m_{a}.

Is it valid to take m_{a}=-2.5log_{10}F_{a}?

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# Flux & apparent magnitude

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