Question #1582

Imagine that you are viewing a star, located about 100 parsecs away with an apparent magnitude of 0.2. The most likely absolute magnitue of the star is:
a. -4.8
b. 0.1
c. 0.2
d. 0.3
I know the answer is "a" which is -4.8, but I dont know how they got that answer?

Expert's answer

Absolute magnitude can be computed by the formula:

M = m - 5(log_{10 }D_{L} - 1) = 0.2 - 5(log10 100 - 1) = -4.8.

M = m - 5(log

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