Tags: Star.
Eta Cephei (η Cep η Cephei) is a star in the northern circumpolar constellation of Cepheus. It shares the name Al Kidr with θ Cep although the meaning of this name is unknown. This star along with α Cep (Alderamin) and β Cep (Alfirk) were identified as Al Kawākib al Firḳ (الكوكب الفرق) meaning the Stars of The Flock by Ulug Beg. With an apparent visual magnitude of 3.4 this is a third magnitude star that according to the Bortle Dark-Sky Scale is readily visible to the naked eye.
