Rho2 Cephei

Rho² Cephei

Observation data Epoch J2000      Equinox J2000
Constellation	Cepheus
Right ascension	22^h 29^m 52.979^s[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
Al Kalb al Rai, 29 Cep, HR 8591, BD +78°801, HD 213798, SAO 10402, FK5 1593, HIP 111056.

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. 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