Rho2 Cephei

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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)
Absolute magnitude (MV)+1.07[4]
Details
Mass2.23±0.03[5] M
Luminosity32[4] L
Surface gravity (log g)4.2[6] cgs
Temperature8,511[5] K
Rotational velocity (v sin i)133[7] km/s
Age85[6] Myr
Other designations
 Cephei, ρ2 Cep, 29 Cephei, BD+78° 801, FK5 1593, HD 213798, HIP 111056, HR 8591, SAO 10402[8]
Database references
SIMBADdata

Rho2 Cephei, Latinized from ρ2 Cephei, or simply ρ Cephei, is a solitary[9] 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.

Rho2 Cephei is an A-type main sequence star with a stellar classification of A3 V,[3] estimated to be 85 million years old. It has a high rate of rotation, showing a projected rotational velocity of 133 km/s.[7] The effective temperature of its photosphere is 8,511 K and its bolometric luminosity, the total amount of radiation it emits at all wavelengths, is 32 L.

References[edit]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 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.
  2. 2.0 2.1 2.2 2.3 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. 3.0 3.1 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. 4.0 4.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, arXiv:1108.4971, Bibcode 2012AstL...38..331A, doi:10.1134/S1063773712050015.
  5. 5.0 5.1 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, arXiv:1201.2052, Bibcode 2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  6. 6.0 6.1 Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal 152 (2): 40. Bibcode 2016AJ....152...40G.
  7. 7.0 7.1 Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode 2007A&A...463..671R, doi:10.1051/0004-6361:20065224.
  8. "rho Cep -- Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=rho02+Cep, retrieved 2017-05-05.
  9. 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, arXiv:0806.2878, Bibcode 2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.


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