ASTRONOMICAL QUANTITIES
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    distance modulus

    The difference between the apparent magnitude (m) of an astronomical object, such as star, and its absolute magnitude (M). The distance modulus is given by

    m - M = 5 log d - 5


    where d is the distance in parsecs.

    Rearranging this enables d to be calculated from the formula

    d = 10(m - M + 5)/5



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       • ASTRONOMICAL QUANTITIES



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