Iota Cephei

Iota Cephei
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cepheus
Right ascension 22h 49m 40.817s[1]
Declination +66° 12′ 01.46″[1]
Apparent magnitude (V) 3.507[2]
Characteristics
Spectral type K0 III[3]
U−B color index +0.924[2]
B−V color index +1.053[2]
Astrometry
Radial velocity (Rv)−12.763±0.0008[4] km/s
Proper motion (μ) RA: −65.89[1] mas/yr
Dec.: −125.17[1] mas/yr
Parallax (π)28.29 ± 0.10 mas[1]
Distance115.3 ± 0.4 ly
(35.3 ± 0.1 pc)
Absolute magnitude (MV)0.76[3]
Details[5]
Mass2.15±0.23 M☉
Radius11.08±0.16 R☉
Luminosity57.0±0.6 L☉
Surface gravity (log g)2.69±0.06 cgs
Temperature4,768±33 K
Metallicity [Fe/H]+0.05±0.10 dex
Rotational velocity (v sin i)10[6] km/s
Age1.2±0.6 Gyr
Other designations
ι Cep, 32 Cep, BD+65°1814, HD 216228, HIP 112724, HR 8694, SAO 20268[7]
Database references
SIMBADdata

Iota Cephei (ι Cephei, ι Cep) is a star in the northern constellation Cepheus. Based upon an annual parallax shift of 28.29 mas as seen from the Earth,[1] it is located about 115 light years from the Sun. The star is visible to the naked eye with an apparent visual magnitude of 3.5.[2]

It is a K-type giant star with a stellar classification of K0 III.[3] It is currently at an evolutionary stage known as the red clump, indicating that it is generating energy through the fusion of helium at its core.[8] It has 11 times the Sun's radius and about 2.15 times the mass of the Sun. Its luminosity is 57 times that of the Sun, and its surface has an effective temperature of 4,768 K.[5]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Jennens1975 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Hekker2006 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference dr2 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Reffert2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Bernacca1970 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Tautvaisiene2010 was invoked but never defined (see the help page).