photovisual magnitude

photovisual magnitude

(foh-toh-vizh -û-ăl) See magnitude.

photovisual magnitude

[¦fōd·ō′vizh·ə·wəl ′mag·nə‚tüd]
(astronomy)
The magnitude of a star, obtained by measuring the size of the star's image on an isochromatic photographic emulsion, using a filter transmitting only the longer wavelengths between 500 and 600 nanometers; nearly identical with visual magnitude.