Wolf–Rayet star
Surface temperature for the central PNN is about , being times as luminous as the sun. Stellar classification is O7 + [WR]-type star. Calculations suggest the PNN is over one solar mass, from a theoretical initial 5 solar masses. The central Wolf–Rayet star has a radius of (452,000 km). The Cat's Eye Nebula, given in some sources, lies about three thousand light-years from Earth.