Tags: Star.
HD 166 or V439 Andromedae (ADS 69 A) is a 6th magnitude star in the constellation Andromeda approximately 45 light years away from Earth. It is a variable star of the BY Draconis type with a variation in brightness smaller than 0.2 magnitude. It is a dwarf star like our Sun yet cooler and dimmer having a stellar classification of spectral type G8V and a surface temperature of 5327 kelvin.