Eta Cephei
Eta Cephei (η Cep, η Cephei) is a star in the northern circumpolar constellation of Cepheus. With an apparent visual magnitude of 3.4, this is a third magnitude star that, according to the Bortle Dark-Sky Scale, is readily visible to the naked eye. Parallax measurements put it at a distance of 46.53 light-years (14.27 parsecs) from Earth.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 20h 45m 17.37555s |
| Declination | +61° 50′ 19.6167″ |
| Apparent magnitude (V) | 3.426 |
| Characteristics | |
| Spectral type | K0 IV |
| U−B color index | +0.613 |
| B−V color index | +0.918 |
| Astrometry | |
| Radial velocity (Rv) | −87.55±0.11 km/s |
| Proper motion (μ) | RA: +86.50 mas/yr Dec.: +818.02 mas/yr |
| Parallax (π) | 70.10 ± 0.11 mas |
| Distance | 46.53 ± 0.07 ly (14.27 ± 0.02 pc) |
| Absolute magnitude (MV) | 2.631 |
| Details | |
| Mass | 1.6 M☉ |
| Radius | 4.12±0.07 R☉ |
| Luminosity | 9.7±0.5 L☉ |
| Surface gravity (log g) | 3.41 cgs |
| Temperature | 4,950 K |
| Metallicity [Fe/H] | −0.32 dex |
| Rotational velocity (v sin i) | 6.79 km/s |
| Age | 2.5±0.3 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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