Iota Cephei

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Iota Cephei
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cepheus
Right ascension 22h 49m 40.91s
Declination +66° 12′ 2.6″
Apparent magnitude (V) 3.50[1]
Absolute magnitude (V) 0.76[1]
Distance 115 ly
(35.28 pc)
Spectral type K0 III[1]
Other designations
32 Cephei, BD+65 1814, FK5 863, HD 216228, HIP 112724, HR 8694, SAO 20268.[2]

Iota Cephei (ι Cephei, ι Cep) is a Class K0, third-magnitude star in the constellation Cepheus. Iota Cephei is an orange giant star about 115 light-years from Earth. This star has 10.05 ± 0.18 times the Sun's radius and about 1.8–2.2 times the mass of the Sun. It is emitting 49.6 ± 2.5 times as much luminosity as the Sun, which is being radiated from its outer atmosphere at an effective temperature of 4,831 ± 74 K.[3] Due to precession of the equinoxes, it will become the north pole star some time around 5200 CE.


  1. ^ a b c Hekker, S.; et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics, 454 (3): 943–949, arXiv:astro-ph/0604502Freely accessible, Bibcode:2006A&A...454..943H, doi:10.1051/0004-6361:20064946 
  2. ^ "HD 216228 -- Variable Star". SIMBAD Astronomical Database. Retrieved 2007-02-28. 
  3. ^ Berio, P.; et al. (November 2011), "Chromosphere of K giant stars. Geometrical extent and spatial structure detection", Astronomy & Astrophysics, 535: A59, arXiv:1109.5476Freely accessible, Bibcode:2011A&A...535A..59B, doi:10.1051/0004-6361/201117479 

External links[edit]

Preceded by
Gamma Cephei
Pole Star
Succeeded by

Coordinates: Sky map 22h 49m 40.91s, +66° 12′ 2.6″