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Absolute magnitude

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1 Absolute magnitude on Thu Dec 16, 2010 6:22 am

In astronomy, absolute magnitude (also known as absolute visual magnitude when measured in the standard V photometric band) measures a celestial object's intrinsic brightness. To derive absolute magnitude from the observed apparent magnitude of a celestial object its value is corrected from distance to its observer. The absolute magnitude then equals the apparent magnitude an object would have if it were at a standard luminosity distance (10 parsecs, or 1 AU, depending on object type) away from the observer, in the absence of astronomical extinction. It allows the true brightnesses of objects to be compared without regard to distance. Bolometric magnitude is luminosity expressed in magnitude units; it takes into account energy radiated at all wavelengths, whether observed or not.
The absolute magnitude uses the same convention as the visual magnitude: a factor of 100.4 (≈2.512) ratio of brightness corresponds to a difference of 1.0 in magnitude. The Milky Way, for example, has an absolute magnitude of about −20.5. So a quasar at an absolute magnitude of −25.5 is 100 times brighter than our galaxy (because (100.4)(-20.5-(-25.5)) = (100.4)5 = 100). If this particular quasar and our galaxy could be seen side by side at the same distance, the quasar would be 5 magnitudes (or 100 times) brighter than our galaxy.

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2 Re: Absolute magnitude on Sun Jan 09, 2011 4:01 am

The Governor of the Commonwealth of Kentucky is the head of the executive branch of government in the U.S. state of Kentucky. Fifty-six men and one woman have held the office of governor of Kentucky. The governor's term is four years in length, and since 1992, incumbents have been able to seek re-election once before becoming ineligible for four years. Over the state's history, four men have served two non-consecutive terms as governor, and two others have served two consecutive terms. Kentucky is one of only five U.S. states that hold gubernatorial elections in odd-numbered years. The current governor is Steve Beshear. His term is set to expire in 2011, and he is seeking re-election.

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