Gamma Cephei

Gamma Cephei is a binary star system in the northern constellation of Cepheus. Its name is a Bayer designation that is Latinized from γ Cephei, and abbreviated Gamma Cep or γ Cep. This system is visible to the naked eye as a point of light with a combined apparent visual magnitude of 3.21. Based on parallax measurements, it is located at a distance of approximately 45 light-years from Earth. The primary, Gamma Cephei A, is officially named Errai, pronounced , the traditional name of the system. It is a stellar class K1 orange giant or subgiant star. The companion, Gamma Cephei B, is a low mass red dwarf star. A confirmed exoplanet is orbiting the primary; it is designated Gamma Cephei Ab, later named Tadmor. Gamma Cephei will succeed Polaris as the Earth's northern pole star, due to axial precession. It will be closer to the northern celestial pole than Polaris around 3157 CE and will make its closest approach around 4094 CE. The "title" will pass to Iota Cephei some time around 5200 CE.