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Distance Modulus

(u)
(apparent magnitude minus absolute magnitude)

A star or other astronomical body's Distance Modulus (u) is an indication of its distance consisting of the difference between its Apparent Magnitude and its Absolute Magnitude. 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

Referenced by:
Planetary Nebula Luminosity Function (PNLF)
Redshift-magnitude Relation

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