Actually, Hilton wouldn't be a star OR a black hole. How could something that's originally a planet-looking thing become a black hole inexplicably? If it can't transform into a star (it does not have hydrogen), if it can't become a gas giant (lack of gasses), and if it can't be a black hole (not enough mass being compressed / lack of gravity) then it MUST be an insanely huge terrestrial planet. (Or a very, very ,very small mini-black hole.)