螣蛇三 （试用）

天鹅座π2

 亮星 

Pi2 Cygni (π2 Cyg, π2 Cygni) is a fourth-magnitude star in the constellation Cygnus. It has the traditional name Pennae Caudalis, which is Latin for "Tail Feathers" (of Cygnus the Swan). Another name is Sama al Azrak (Arabic السماء الازرق ~ as-sama al-azraq), meaning "The Blue Sky".