Astrophysics (index)

Distance Modulus

(u)
(apparent magnitude minus absolute magnitude)

A star or other astronomical body's Distance Modulus (u) is an indication of its distance. The difference between the Apparent Magnitude (m) and the Absolute Magnitude (M). It is directly related to the distance to the star if there is no Absorption.

u = 5 log10d - 5

(measure,EMR,logarithmic,distance,magnitude)
http://en.wikipedia.org/wiki/Distance_modulus

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