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| abstraction > mathematical concept > number > quantity > radiation measurement > magnitude > apparent magnitude > photovisual magnitude |
| photovisual magnitude comparison table | ||
| Subject | is a kind of | has definition |
|---|---|---|
| apparent magnitude | magnitude | Measure 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 magnitude | apparent magnitude | The 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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