Iota Cephei
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, 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.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 49m 40.817s |
| Declination | +66° 12′ 01.46″ |
| Apparent magnitude (V) | 3.507 |
| Characteristics | |
| 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 | |
| Database references | |
| SIMBAD | data |
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.
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