The brightness of a star is called its Absolute magnitude (M). The equation M = a + 5 - 5 log d is used to find the Absolute magnitude of a star. a represents the apparent magnitude and d is the distance, measured in a unit called parsecs, from earth.

The Absolute magnitude of a star is 0.45 and the apparent magnitude is 0.009, how far is the star from earth?

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30 September, 22:36

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Ashanti Nolan · Answer 1

Hello,

d=10^ ((5+0.009-0.45) / 5) parsec

≈8,162064 ... parsec

≈1683546.565738 ... ua

≈2.5185498*10^17 m

≈26,62109273 ... light-years.