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 |
Distance | 245 ± 4 ly (75 ± 1 pc) |
Details | |
Rotational velocity (v sin i) | 133[4] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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 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 , doi:10.1051/0004-6361:20078357.
- 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.
- 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.
- 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 , doi:10.1051/0004-6361:20065224.
- ↑ "rho Cep -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-05.
- ↑ 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 , doi:10.1111/j.1365-2966.2008.13596.x.
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