Alcyone’s fifth star, Dixie, has a system of three planets and an asteroid belt that is probably the remains of a fourth.  They are the only remaining stable planets in the entire Alcyone star system, and humans live on all three of them.  Two of them are actually very comfortable.  The third, not so much.  Dixie and her three worlds are the center of human civilization in the Pleiades Cluster, the heart of power for the entire sector.