Betelgeuse IV

Betelgeuse IV was a Federation member planet in the Betelgeuse star system. It was one of three class M planets in the system and at one time had a Betelgeusian population.

Betelgeusians considered it their homeworld, and gave it the indigenous name of Hav'a'halar. 

History
As the star Betelgeuse was entering a later stage of life, heading toward a supernova that would endanger worlds for parsecs around it, the Betelgeusians migrated out of the region, living on space stations and starships.