Andromeda constellation is located in the northern sky. It is one of the 48 Greek constellations. Andromeda is the 19th largest constellation in the sky. The brightest star in the constellation is Alpha Andromedae, also known by its traditional name, Alpheratz. The star is located 97 light years from Earth. Alpheratz is a binary star. The companion star is more massive than the Sun and has a luminosity 10 times that of the Sun.