Pi2 Cygni
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 21h 46m 47.61s |
| Declination | +49° 18' 34.5" |
| Apparent magnitude (V) | +4.23 |
| Absolute magnitude (V) | -3.52 |
| Distance | 1156 ly (354.6 pc) |
| Spectral type | B3III |
| Other designations | |
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)[1]
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.
References
- "HD 207330 -- Spectroscopic binary". SIMBAD Astronomical Database. Retrieved 2007-01-25.