Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cepheus |
Right ascension | 20h 45m 17.37517s[1] |
Declination | +61° 50′ 19.6142″[1] |
Apparent magnitude (V) | 3.426[2] |
Characteristics | |
Spectral type | K0 IV[3] |
U−B color index | +0.613[2] |
B−V color index | +0.918[2] |
Astrometry | |
Radial velocity (Rv) | −87.55±0.11[4] km/s |
Proper motion (μ) | RA: +85.993 mas/yr[1] Dec.: +818.451 mas/yr[1] |
Parallax (π) | 69.5976 ± 0.1279 mas[1] |
Distance | 46.86 ± 0.09 ly (14.37 ± 0.03 pc) |
Absolute magnitude (MV) | 2.631[3] |
Details | |
Mass | 1.6[5] M☉ |
Radius | 3.86±0.02[6] R☉ |
Luminosity | 8.4±0[6] L☉ |
Surface gravity (log g) | 3.41[7] cgs |
Temperature | 5,000±9[6] K |
Metallicity [Fe/H] | −0.32[7] dex |
Rotational velocity (v sin i) | 6.79[8] km/s |
Age | 2.5±0.3[5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Eta Cephei (η Cep, η Cephei) is a star in the northern circumpolar constellation of Cepheus. With an apparent visual magnitude of 3.4,[2] 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 14.37 parsecs (46.9 light-years) from Earth.[1]
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