Absolute MagnitudeRecall the definition of absolute magnitude
Absolute magnitude is a useful way of finding out how bright a star would appear from a certain point in space. By doing this we understand each star's true magnitude.
The true absolute magnitude for the Sun is 4.2 whereas to us on Earth it is -27.
It is the brightness of a star at a distance of 10 parsecs which is 32.6 light years.
It is calculated using the following equation:
M = m + 5 - 5 log D
M = Absolute Magnitude
m= apparent magnitude
You can practice some apparent magnitude calculations on the Magnitude Calculations page.