The best current estimate of the distance from Earth to the red supergiant Betelgeuse is about 600 light-years. If it were to explode as a supernova, it would be one of the brightest stars in the sky. Right now, the brightest star other than the Sun is Sirius, with a luminosity of 26LSun
and a distance of 8.6 light-years.

How much brighter in our sky than Sirius would the Betelgeuse supernova be if it reached a maximum luminosity of 1.2×1010LSun?