Alpheratz

Alpheratz is a blue subgiant (spectral type B8IV) about 97 light-years away. With an apparent magnitude of 2.07 it is easy to see even from a city.

The brightest star in Andromeda and at the same time a corner of the Great Square of Pegasus.

Its light output is roughly 110 times that of the Sun (a rough estimate in visible light, calculated from brightness and distance).

From Germany (52° N) it rises and sets; it is best seen in the evening in September.