Rho2 Cephei

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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
Spectral type A3 V
U−B color index 0.07
B−V color index 0.06
Variable type None
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
Al Kalb al Rai, 29 Cep, HR 8591, BD +78°801, HD 213798, SAO 10402, FK5 1593, HIP 111056.

Rho2 Cephei2 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.


  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry