Zeta Cephei is a binary star system located in the constellation Cepheus. It is approximately 29 light-years away from Earth and consists of two stars: a giant star and a smaller companion star. The primary star is classified as a spectral type G giant, which means it is larger and cooler than our Sun. The system is notable for its brightness, with an apparent magnitude of about 4.5, making it visible to the naked eye. Zeta Cephei is also of interest to astronomers because it provides insights into stellar evolution and the dynamics of binary systems.