Page "Absolute magnitude" Paragraph 3

The absolute magnitude uses the same convention as the visual magnitude: a factor of 10 < sup > 0. 4 </ sup > (≈ 2. 512 ) ratio of brightness corresponds to a difference of 1. 0 in magnitude.

The Milky Way, for example, has an absolute magnitude of about − 20. 5.

So a quasar at an absolute magnitude of − 25. 5 is 100 times brighter than our galaxy ( because ( 10 < sup > 0. 4 </ sup >)< sup >(− 20. 5 -(− 25. 5 ))</ sup >