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The A consequence of magnitudes being logarithmic is no magnitude cannot represent "zero Flux" since zero has no logarithm (or it might be referred to as "minus infinity"). A brightness must be chosen to be represented by zero magnitude, which defines the magnitude's scale. The Vega System can be thought of as part of (or the same thing as) the UBV Photometric System. Other systems include the AB System, which makes no pretense of matching any particular star. measure,brightness,logarithmic,EMR,magnitude)Referenced by:
AB System |