photovisual magnitude

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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.

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