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|magnitude, Pogson||The Pogson magnitude is the standard astronomical magnitude system, where one
increment in magnitude is an increase in brightness by the fifth root of 100.
A star of 1st magnitude is therefore 100 times as bright as a star of 6th magnitude. Mathematically this is expressed as|
where M1 and M2 are the magnitudes of two objects, and F1 and F2 are their luminous fluxes.