Alpha Centauri IV (commonly known as Velestus, Centaurus or Al Rijil IV) is the fourth planet in the Alpha Centauri star system, orbiting the primary binary pair of stars, Rigil Kentaurus and Quindar. This world is class M and is home to humanoid inhabitants, including a thriving Federation colony started by Human settlers and other Centauran cultures. (ST reference: The Worlds of the Federation; TOS novels: Crisis on Centaurus, Time for Yesterday)