Extraterrestrial Skies - A Note On Calculating Apparent Magnitudes

A Note On Calculating Apparent Magnitudes

The brightness of an object varies as the inverse square of the distance. The apparent magnitude scale varies as −2.5 times the (base-10) logarithm of the brightness. Thus if an object has apparent magnitude at distance from the observer, then all other things being equal, it will have magnitude at distance .

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