Distance Modulus

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distance modulus [′dis·təns ‚mäj·ə·ləs]

(astronomy)

modulus of distance

Distance Modulus

in astronomy, the difference between the apparent (m) and absolute (M) magnitudes of a celestial body. This quantity is used to describe distances to stars and stellar systems. Whereas M depends only on the intrinsic luminosity of a star, m depends also on the distance r (in parsecs) to the star, that is, m – M = 5 log r — 5.

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