Epsilon Cephei
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 15m 02.19530s |
| Declination | +57° 02′ 36.8771″ |
| Apparent magnitude (V) | 4.15 - 4.21 |
| Characteristics | |
| Spectral type | F0 V (Sr II) or F0 IV |
| U−B color index | +0.073 |
| B−V color index | +0.277 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | −4.7±0.8 km/s |
| Proper motion (μ) | RA: +481.53 mas/yr Dec.: +46.04 mas/yr |
| Parallax (π) | 38.17±0.97 mas |
| Distance | 85 ± 2 ly (26.2 ± 0.7 pc) |
| Absolute magnitude (MV) | +2.13 |
| Details | |
| ε Cep Aa | |
| Mass | 1.64 M☉ |
| Radius | 1.86 R☉ |
| Luminosity | 11.65 L☉ |
| Surface gravity (log g) | 4.11±0.14 cgs |
| Temperature | 7,514±255 K |
| Metallicity [Fe/H] | +0.08 dex |
| Rotational velocity (v sin i) | 91 km/s |
| Age | 1.097 Gyr |
| ε Cep Ab | |
| Mass | 0.57 M☉ |
| Other designations | |
| ε Cephei, 23 Cephei, BD+56 2741, HD 211336, HIP 109857, HR 8494, SAO 34227 | |
| Database references | |
| SIMBAD | data |
Epsilon Cephei, Latinized from ε Cephei, is a star in the northern constellation of Cepheus. Based upon an annual parallax shift of 38.17 mas as seen from the Earth, it is located about 85 light years from the Sun. The star is visible to the naked eye with an apparent visual magnitude of 4.18.