Primary Pi Cephei Aa Primary Pi Cephei A (Aa + Ab) Magnitude 4.419 Apparent magnitude (V) 4.419 | Companion Pi Cephei Ab Companion Pi Cephei B Constellation Cepheus Eccentricity 0.58 | |
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Pi Cephei (π Cephei) is a trinary star located in the constellation Cepheus. With an apparent magnitude of about 4.4, the system is faintly visible to the naked eye. The inner pair of stars orbits in 1.5 years while the outer companion completes one orbit in about 160 years.
Stellar system
Pi Cephei was found to have a visual companion star by Otto Wilhelm von Struve in 1843. That the primary is itself a spectroscopic binary was first noticed by William Wallace Campbell in 1901 using photographic plates taken at Lick Observatory.
References
Pi Cephei Wikipedia(Text) CC BY-SA