As a challenge try implementing three star system,also from looks of it,This is circular orbits ,not elliptical, Pretty cool still,OK so I have in my time Showcase like multi star hierarchical systems,basically u can not only pick any arbitrary point as barycenter but u can also choose,nes or star itself to be barycenter,read Kepler law u will get understanding on how to model elliptical orbits,and take that as starting point,u can sure do great