Rho2 Cephei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 29m 52.979s[1] |
| Declination | +78° 49′ 27.43″[1] |
| Apparent magnitude (V) | 5.50 |
| Characteristics | |
| Spectral type | A3 V |
| U−B color index | 0.07 |
| B−V color index | 0.06 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | +1 km/s |
| Proper motion (μ) | RA: 3.68 ± 0.26[1] mas/yr Dec.: –21.29 ± 0.21[1] mas/yr |
| Parallax (π) | 13.31 ± 0.21[1] mas |
| Distance | 245 ± 4 ly (75 ± 1 pc) |
| Absolute magnitude (MV) | 1.19 |
| Other designations | |
Rho2 Cephei (ρ2 Cep / ρ2 Cephei) is a star in the constellation Cepheus. It has the traditional name Al Kalb al Rai.
Rho2 Cephei is an optical double star located in the constellation Cepheus. The other component is Rho1 Cephei, and somewhat less prominent.
Rho2 Cephei is an A3V star with an apparent visual magnitude of +5.50, and absolute magnitude of +1.19. Rho2 Cephei is located 73 pc from the Sun.
Rho2 Cephei is located at Right Ascension 22h 29m 52.90s and Declination +78deg 49 arcmin 27.00 arcsec.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
- http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%40278288&Name=*%20%2028%20Cep&submit=submit
- http://server7.wikisky.org/starview?object_type=1&object_id=4421
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