Iota Cephei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 49m 40.817s |
| Declination | +66° 12′ 01.46″ |
| Apparent magnitude (V) | 3.507 |
| Characteristics | |
| Evolutionary stage | red clump |
| Spectral type | K0 III |
| U−B color index | +0.924 |
| B−V color index | +1.053 |
| Astrometry | |
| Radial velocity (Rv) | −12.763±0.0008 km/s |
| Proper motion (μ) | RA: −65.89 mas/yr Dec.: −125.17 mas/yr |
| Parallax (π) | 28.29±0.10 mas |
| Distance | 115.3 ± 0.4 ly (35.3 ± 0.1 pc) |
| Absolute magnitude (MV) | 0.76 |
| Details | |
| Mass | 2.15±0.23 M☉ |
| Radius | 11.08±0.16 R☉ |
| Luminosity | 57.0±0.6 L☉ |
| Surface gravity (log g) | 2.69±0.06 cgs |
| Temperature | 4,768±33 K |
| Metallicity [Fe/H] | +0.05±0.10 dex |
| Rotational velocity (v sin i) | 10 km/s |
| Age | 1.2±0.6 Gyr |
| Other designations | |
| ι Cep, 32 Cep, BD+65°1814, HD 216228, HIP 112724, HR 8694, SAO 20268 | |
| Database references | |
| SIMBAD | data |
Iota Cephei is a star in the northern constellation Cepheus. Its name is a Bayer designation that is Latinized from ι Cephei, and abbreviated Iota Cep or ι Cep. Based upon an annual parallax shift of 28.29 mas as seen from the Earth, it is located about 115 light-years (35 pc) from the Sun. The star is visible to the naked eye with an apparent visual magnitude of 3.5.
It is a K-type giant star with a stellar classification of K0 III. 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. 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.