- Magnitude of Stars The magnitude M of a star is a measure of how bright a star appears to the human eye. It is defined by B M = -2.5 log( Bo where B is the actual brightness of the star and B, is a constant. (a) Expand the right-hand side of the equation. (b) Use part (a) to show that the brighter a star, the less its magnitude. (c) Betelgeuse is about 100 times brighter than Albiero. Use part (a) to show that Betelgeuse is 5 magnitudes less bright than Albiero.

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