Rho2 Cephei

Rho2 Cephei
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cepheus
Right ascension 22h 29m 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[1] mas
Distance245 ± 4 ly
(75 ± 1 pc)
Details
Rotational velocity (v sin i)133[4] km/s
Other designations
ρ2 Cep, 29 Cep, BD+78° 801, FK5 1593, HD 213798, HIP 111056, HR 8591, SAO 10402[5]
Database references
SIMBADdata

Rho2 Cephei (ρ2 Cep / ρ2 Cephei) is a solitary[6] star in the northern constellation of Cepheus. 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. This is an A-type main sequence star with a stellar classification of A3 V.[3] It has a high rate of rotation, showing a projected rotational velocity of 133 km/s.[4]

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752 Freely accessible, doi:10.1051/0004-6361:20078357.
  2. 1 2 3 4 Oja, T. (April 1983), "UBV photometry of FK4 and FK4 supplement stars", Astronomy and Astrophysics Supplement Series, 52: 131−134, Bibcode:1983A&AS...52..131O.
  3. 1 2 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. 1 2 Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, Bibcode:2007A&A...463..671R, arXiv:astro-ph/0610785 Freely accessible, doi:10.1051/0004-6361:20065224.
  5. ↑ "rho Cep -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-05.
  6. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, Bibcode:2008MNRAS.389..869E, arXiv:0806.2878 Freely accessible, doi:10.1111/j.1365-2966.2008.13596.x.


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