## combined magnitudeCombined magnitude is the total brightest of two or more celestial objects, such as the stars of a binary system that appear as a single point to the naked eye. Unfortunately, this can't be found simply by adding the separate magnitudes, m_{1} and m_{2},
because the magnitude scale is logarithmic.
Instead the combined magnitude, m, has to be calculated from the
formula:m = m_{1} - 2.5 log {1 + antilog [-0.4 (m_{2} - m_{1})]}.
## Related categories• ASTRONOMICAL QUANTITIES• STELLAR ASTROPHYSICS | |||||

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