photographic magnitude

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(mpg) The brightness of a star measured with a blue-sensitive (orthochromatic) photographic plate. This magnitude is poorly defined because different amounts of ultraviolet light are included depending on whether a refractor or an aluminized reflector is used. Although this magnitude is now obsolete, it can be roughly related to the B magnitude by the approximation

B ≈ mpg + 0.11

Subjects: Astronomy and Astrophysics.

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