Castor B

Its story

Castor B is the white companion of famous Castor, together 51.6 light-years away in Gemini. What the eye perceives as a single point is in fact a multiple system, and B is one of its main pieces: itself a binary star, gravitationally bound to its twin. That two stars called «brothers» should each split into pairs and trios feels like a joke of the sky: the Greek myth of the twins repeated at stellar scale.