Epoch J2000.0 Equinox J2000.0
|Right ascension||22h 49m 40.91s|
|Declination||+66° 12′ 2.6″|
|Apparent magnitude (V)||3.50|
|Absolute magnitude (V)||0.76|
|Spectral type||K0 III|
Iota Cephei (ι Cep, ι Cep) is a Class K0, third-magnitude star in the constellation Cepheus. Iota Cephei is an orange giant star located 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 as much luminosity as the Sun, which is being radiated from its outer atmosphere at an effective temperature of 4,831 ± 74 K. Due to precession of the equinoxes, it will become the pole star some time around 5200 CE.
- 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/0604502, Bibcode:2006A&A...454..943H, doi:10.1051/0004-6361:20064946
- "HD 216228 -- Variable Star". SIMBAD Astronomical Database. Retrieved 2007-02-28.
- Berio, P. et al. (November 2011), "Chromosphere of K giant stars. Geometrical extent and spatial structure detection", Astronomy & Astrophysics 535: A59, arXiv:1109.5476, Bibcode:2011A&A...535A..59B, doi:10.1051/0004-6361/201117479