Pi Cygni

The Bayer designation Pi Cygni (π Cyg / π Cygni) is shared by two stars, in the constellation Cygnus:

Pi1 Cygni

Pi1 Cygni (π¹ Cyg, π¹ Cygni) is the Bayer designation for a star in the constellation Cygnus. It has the traditional name Azelfafage.

In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of π¹ Cygni, α Lacertae, 4 Lacertae, π² Cygni, HD 206267, ε Cephei, β Lacertae, σ Cassiopeiae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ψ Andromedae and ι Andromedae. Consequently, π¹ Cygni itself is known as 螣蛇四 (Téng Shé sì, English: the Fourth Star of Flying Serpent)

Structure

Pi¹ Cygni has apparent magnitude +4.67 and belongs to the spectral class B3IV. It is approximately 1680 light years from Earth.

Coordinates (equinox J2000.0):

HIP 107136 HR 8301

Etymology

The name Azelfafage was from Arabic ظلف الفرس Dhilf al-faras meaning "the horse track" or (probably) ذيل الدجاجة Dhail al-dajāja^h meaning "the tail of hen".

References

Pi2 Cygni

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".

In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of π² Cygni, α Lacertae, 4 Lacertae, π¹ Cygni, HD 206267, ε Cephei, β Lacertae, σ Cassiopeiae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ψ Andromedae and ι Andromedae. Consequently, π² Cygni itself is known as 螣蛇三 (Téng Shé sān, English: the Third Star of Flying Serpent)

Structure

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.