Rho2 Cephei
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 29m 52.97918s |
| Declination | +78° 49′ 27.4282″ |
| Apparent magnitude (V) | 5.50 |
| Characteristics | |
| Spectral type | A3 V |
| U−B color index | +0.07 |
| B−V color index | +0.06 |
| Astrometry | |
| Proper motion (μ) | RA: +3.68 mas/yr Dec.: −21.29 mas/yr |
| Parallax (π) | 13.31±0.21 mas |
| Distance | 245 ± 4 ly (75 ± 1 pc) |
| Absolute magnitude (MV) | +1.07 |
| Details | |
| Mass | 2.23±0.03 M☉ |
| Luminosity | 32 L☉ |
| Surface gravity (log g) | 4.2 cgs |
| Temperature | 8,511 K |
| Rotational velocity (v sin i) | 133 km/s |
| Age | 85 Myr |
| Other designations | |
| Cephei, ρ2 Cep, 29 Cephei, BD+78°801, FK5 1593, HD 213798, HIP 111056, HR 8591, SAO 10402 | |
| Database references | |
| SIMBAD | data |
Rho2 Cephei, Latinized from ρ2 Cephei, or simply ρ Cephei, is a solitary star in the northern constellation of Cepheus. With an apparent visual magnitude of 5.50, 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, 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, estimated to be 85 million years old. It has a high rate of rotation, showing a projected rotational velocity of 133 km/s. 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☉.