Eta

Its story

Eta Sculptoris is a red giant of type M2 in the quiet Sculptor: nearly eighty times the Sun's radius and a thousand times its luminosity, with a surface so cool it barely reaches 3,000 K. It pulses as a semiregular variable with interlaced periods of 22, 47 and up to 158 days, drifting gently between magnitudes 4.80 and 4.90. An old age stretched out and luminous, seen at 452 light-years.