Pi2 Cygni

Starbox short
name=Pi² Cygni
epoch=J2000.0
constell=Cygnus
ra=21^h 46^m 47.61^s
dec=+49° 18' 34.5"
spectral=B3III
appmag_v=+4.23
absmag_v=-3.52
dist_ly=1156
dist_pc=354.6
names=Sama al Azrak, 81 Cygni, HR 8335, HD 207330, BD+48 3504, FK5 821, HIP 107533, SAO 51293, GC 30512

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".

Pi² Cygni is a spectroscopic binary with its main component being a Class B3 blue giant star with an apparent magnitude of +4.23 and a stellar luminosity nearly 2,200 times that of the Sun. This binary star system is approximately 1156 light years from Earth.

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