| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h29m 52.97918s[1] |
| Declination | +78° 49′ 27.4282″[1] |
| Apparent magnitude (V) | 5.50[2] |
| Characteristics | |
| Spectral type | A3 V[3] |
| U−B color index | +0.07[2] |
| B−V color index | +0.06[2] |
| Astrometry | |
| Proper motion (μ) | RA: +3.68[1] mas/yr Dec.: −21.29[1] mas/yr |
| Parallax (π) | 13.31 ± 0.21 mas[1] |
| Distance | 245 ± 4 ly (75 ± 1 pc) |
| Absolute magnitude (MV) | +1.07[4] |
| Details | |
| Mass | 2.23±0.03[5] M☉ |
| Luminosity | 32[4] L☉ |
| Surface gravity (log g) | 4.2[6] cgs |
| Temperature | 8,511[5] K |
| Rotational velocity (v sin i) | 133[7] km/s |
| Age | 85[6] Myr |
| Other designations | |
Cephei, ρ2 Cep, 29 Cephei, BD+78° 801, FK5 1593, HD 213798, HIP 111056, HR 8591, SAO 10402[8] | |
| Database references | |
| SIMBAD | data |
Rho2 Cephei, Latinized from ρ2 Cephei, or simply ρ Cephei, is a solitary[9] star in the northern constellationofCepheus. With an apparent visual magnitude of 5.50,[2] it is faintly visible to the naked eye, forming an optical pair with Rho1 Cephei. Based upon an annual parallax shift of 13.31 mas as seen from the Earth,[1] it is located about 245 light years from the Sun.
Rho2 Cephei is an A-type main sequence star with a stellar classification of A3 V,[3] estimated to be 85 million years old. It has a high rate of rotation, showing a projected rotational velocity of 133 km/s.[7] The effective temperature of its photosphere is 8,511 K and its bolometric luminosity, the total amount of radiation it emits at all wavelengths, is 32 L☉.
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