Chi

Its story

Chi Andromedae is a yellow G8 giant 250 light-years away, an older sister of the Sun that has already exhausted its core hydrogen and swollen into its slow stellar old age. It is a spectroscopic binary with an estimated orbital period of 20.8 years and notable eccentricity. It shares the sky with the spiral galaxy M31, the most distant object visible to the naked eye from Earth: a relative neighbour in a constellation open to the infinite.