Luminosity Distance
(a) Any distance to a celestial object which has been calculated using a standard candle.
where is the star's luminosity distance in parsecs, wherein 1 parsec is approximately 3.2616 light-years.
(b) If the intrinsic luminosity of a distant object is known, then measurement of its apparent brightness and application of the inverse square law enables the luminosity distance to be calculated.
The luminosity distance is that which makes the inverse-square law work as it does in a flat universe: luminosity/flux = 4 p DL².
 See also: Luminosity, Galaxies, Energy, Light, Diameter
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