<P> Rigel has a visual magnitude m of 0.12 and distance about 860 light - years </P> <Dl> <Dd> M V = 0.12 − 5 (log 10 ⁡ 860 3.2616 − 1) = − 7.0 . (\ displaystyle M_ (\ mathrm (V)) = 0.12 - 5 \ left (\ log _ (10) (\ frac (860) (3.2616)) - 1 \ right) = - 7.0 .) </Dd> </Dl> <Dd> M V = 0.12 − 5 (log 10 ⁡ 860 3.2616 − 1) = − 7.0 . (\ displaystyle M_ (\ mathrm (V)) = 0.12 - 5 \ left (\ log _ (10) (\ frac (860) (3.2616)) - 1 \ right) = - 7.0 .) </Dd> <P> Vega has a parallax p of 0.129", and an apparent magnitude m of 0.03 </P>

What is the difference between the absolute and apparent magnitudes of a star