- luminosity distance
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An estimate of the distance of a body based on its luminosity and the inverse square law.
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luminosity distance
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Luminosity distance — DL is defined in terms of the relationship between the absolute magnitude M and apparent magnitude m of an astronomical object.: M = m 5 (log {10}{D L} 1)!,which gives:: D L = 10^{frac{(m M)}{5}+1}where DL is measured in parsecs. For nearby… … Wikipedia
Distance measures (cosmology) — Physical cosmology Universe · Big Bang … Wikipedia
Luminosity — has different meanings in several different fields of science.In photometry and color imagingIn photometry, luminosity is sometimes incorrectly used to refer to luminance, which is the density of luminous intensity in a given direction. The SI… … Wikipedia
luminosity — (n.) 1630s, quality of being luminous, from Fr. luminosité or else a native formation from LUMINOUS (Cf. luminous) + ITY (Cf. ity). In astronomy, intrinsic brightness of a heavenly body (as distinguished from apparent magnitude, which diminishes… … Etymology dictionary
Distance modulus — The distance modulus is a way of expressing distances that is often used in astronomy. Contents 1 Definition 2 Different kinds of distance moduli 3 Usage 4 References … Wikipedia
Cosmic distance ladder — * Light green boxes: Technique applicable to star forming galaxies. * Light blue boxes: Technique applicable to Population II galaxies. * Light Purple boxes: Geometric distance technique. * Light Red box: The planetary nebula luminosity function… … Wikipedia
Extragalactic distance scale — The extragalactic distance scale is a series of techniques used today by astronomers to determine the distance of cosmological bodies (beyond our own galaxy) not easily obtained with traditional methods. Some procedures utilize properties of… … Wikipedia
Mass–luminosity relation — In astrophysics, the mass–luminosity relation is an equation giving the relationship between a star s mass and its luminosity. The relationship is represented by the equation: where L⊙ and M⊙ are the luminosity and mass of the sun and… … Wikipedia
Planetary nebula luminosity function — (PNLF) is a secondary distance indicator used in astronomy. It makes use of the [O III| [O III] λ5007 forbidden line found in all planetary nebula which are members of the old stellar populations (Population… … Wikipedia
Solar luminosity — The solar luminosity, L odot, is a unit of luminosity (power emitted in the form of photons) conventionally used by astronomers to give the luminosities of stars.It is equal to the current accepted luminosity of the Sun, which is 3.839 times;… … Wikipedia
