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I am working on a problem that requires me to calculate the brightness of a distant star. The problem i have is that the only information i have on the star is its distance and its apparent magnitude.

I think that i can solve this problem with the equation for magnitude i.e

m = -2.5 log(b/b0)

Where b = brightness of star and b0 = brightness of reference star with magnitude zero.

What i am struggling with is how to rearrange this equation to find the brightness of the distant star.

a) Can this equation be reaaranged to find the brightness required.

b) Is there another method that can help me find the required brightness with the limited information i have.

thanks for your help.

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# Homework Help: Apparent visual magnitude/brightness problem

**Physics Forums | Science Articles, Homework Help, Discussion**