Polyphemus is the last of three gas giants and also the last planet orbiting the star Alpha Centauri A (ACA) in the Alpha Centauri System, the other Gas Giants being Polyphemus, and the aptly named Alpha Centauri. Slightly larger than Jupiter and having less density, Omega Centauri has eight moons and a cloak of gaseous rings thinly veiling its actual atmosphere.