Tags: Star.
Gamma Cephei (γ Cep γ Cephei) traditionally named Errai Er Rai and or Alrai is a binary star system approximately 45 light-years away in the constellation of Cepheus. Gamma Cephei contains an apparent magnitude of 3.22. The visible part of the system is a stellar class K1III-IV orange subgiant star on its first ascent off the main sequence. It is about 6.6 billion years old (based on Fe/H metallicity).
