| quantity that correlates with the more or less luminous aspect of a star and that is defined by the formula m = mo − 2,5 log10(Epb/Eo) where Epb is the point brilliance of the star considered, mo and Eo are constants based on the magnitudes ascribed to certain standard stars Note 1 to entry: In addition to the (visual) apparent magnitude defined here, other apparent magnitudes (photographic, bolometric, etc.) are defined by the same formula, but where Epb and Eo are the responses of a detector having a specified spectral responsivity. Note 2 to entry: The apparent magnitude has unit one. Note 3 to entry: This entry was numbered 845-01-60 in IEC 60050-845:1987.
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