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photographic magnitude

photographic magnitude

A Dictionary of Astronomy | 1997 | Copyright

photographic magnitude (symbol 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 approximationB ≈ mpg + 0.11
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photographic magnitude

The Columbia Encyclopedia, 6th ed. | 2011 | Copyright

photographic magnitude see magnitude .

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