Rho-1

Its story

Rho-1 Eridani is an orange red-clump giant on the horizontal branch of the Hertzsprung-Russell diagram: it has exhausted its core hydrogen and is now fusing helium in its centre. At 324 light-years, in the immense serpentine of the river Eridanus crossing the southern sky, it belongs to a multiple system whose warm light has been travelling to us for centuries.