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Blech. These are the grossest words.

distance modulus

(astronomy) a measure of the distance, r, of a celestial object too far away to show measurable parallax. It is given by mM = 5 log(r/10), where m is its apparent magnitude (corrected for interstellar absorption) and M is its absolute magnitude
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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