distance modulus


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distance modulus

(moj -ŭ-lŭs) The difference between the apparent magnitude, m , and the absolute magnitude, M , of a star and therefore a measure of distance (see magnitude):
m M = 5 log(d /10) = 5 logd – 5

where d is the distance in parsecs. Distance modulus is used to determine the distances of stars and stellar clusters. It is corrected for interstellar extinction by an additional term (see magnitude).

Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

distance modulus

[′dis·təns ‚mäj·ə·ləs]
(astronomy)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Redshift Adjustment to the Distance Modulus. Progress in Physics, 2012, v.
In order to compute the luminosity distance we use the redshift adjusted distance modulus provided in [2] which is as follows:
Let us recall the derivation of the distance modulus. The magnitude as defined by Pogson [1] is:
Planck's law for the energy of the photon leads to a redshift correction to the distance modulus
The HST data set had an additional 0.08 magnitude added to the distance modulus errors to allow for the intrinsic dispersion of the supernova luminosities.

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