absolute magnitude

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Related to Absolute Visual Magnitude: luminosity, Bolometric magnitude

absolute magnitude

n.
The intrinsic brightness of a celestial body, measured in magnitudes, computed as if viewed from a distance of 10 parsecs, or 32.6 light years.

absolute magnitude

n
(Astronomy) the apparent magnitude a given star would have if it were situated at a distance of 10 parsecs (32.6 light years) from the earth

ab′solute mag′nitude


n.
the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years.
[1900–05]

absolute magnitude

A star’s size when seen from a distance of 10 parsecs.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.absolute magnitude - (astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earthabsolute magnitude - (astronomy) the magnitude that a star would have if it were viewed from a distance of 10 parsecs (32.62 light years) from the earth
magnitude - the property of relative size or extent (whether large or small); "they tried to predict the magnitude of the explosion"; "about the magnitude of a small pea"
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
References in periodicals archive ?
Fact sheet: the Sun Age (years) 4.5 x [10.sup.9] Mass (kg) 1.9891 x [10.sup.30] Diameter (km) 1.392 x [10.sup.5] Escape velocity (km x [s.sup.-1]) 617.7 Luminosity (watt) 3.846 x [10.sup.25] Mass conversion rate (kg x [s.sup.-1]) 4.3 x [10.sup.9] Absolute visual magnitude + 4.83 Apparent visual magnitude -26.74 Distance from Earth (km) 1.47-1.52 x [10.sup.8] Core pressure (atmosphere) 2.452 x [10.sup.11] Core temperature ([degrees]C) 1 .571 x [10.sup.7] Rotation period at equator (days) 26.8 Rotation period at poles (days) 36 Composition (% H, He) 92.1, 7.8 Caption: Figure 1.
This can be contrasted with the HRD which plots absolute visual magnitude Mv against intrinsic colour index [(B-V).sub.0].
With an absolute visual magnitude of -34, the brief afterglow appeared to emit 2.5 million times as much light as the most luminous supernova ever recorded (SN 2005ap).