17-50

apparent magnitude (of an astronomical object) [m]

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 (E/Eo)

where E is the point brilliance of the star considered, mo and Eo are constants based on the magnitudes ascribed to certain standard stars

Unit: 1

NOTE In addition to the visual apparent magnitude defined here, other apparent magnitudes (photographic, bolometric, etc.) are defined by the same formula, but where E and Eo are the responses of a detector having a specified spectral responsivity.

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