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UBV system
(redirected from UBV photometric system)

    Also found in: Wikipedia 0.01 sec.
UBV system [¦yü‚bē¦vē ‚sis·təm]
(astronomy)
A system of stellar magnitudes in which an object's apparent magnitude is measured at three wavelengths, labeledU, at 360 nanometers;B, at 420 nanometers; andV, at 540 nanometers; and is characterized by the color indicesB-VandU-B, which are both defined to be 0 for a star of spectral type A0. Also known as Johnson-Morgan system.
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