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abstraction > mathematical concept > number > quantity > radiation measurement > magnitude > apparent magnitude > photovisual magnitude
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photovisual magnitude comparison table
Subject is a kind of has definition
apparent magnitudemagnitudeMeasure of the observed brightness of a celestial object as seen from the Earth. It is a function of the star's intrinsic brightness, its distance from the observer, and the amount of absorption by interstellar matter between the star and the observer. The mv, of Sun, -26.5 mag. A sixth-magnitude star is just barely visible to the naked eye.
photovisual magnitudeapparent magnitudeThe magnitude of an object as measured photographically by filters and emulsions that are sensitive to the same region of the spectrum as the human eye. (antiquated)

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