19 Cephei

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19 Cep
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 22h 05m 08.78995s[1]
Declination +62° 16′ 47.3301″[1]
Apparent magnitude (V) 5.08[2]
Spectral type O9Ib[3]
U−B color index −0.91[2]
B−V color index +0.06[2]
Radial velocity (Rv) −12.8±0.9[4] km/s
Proper motion (μ) RA: −1.16[1] mas/yr
Dec.: −2.96[1] mas/yr
Parallax (π) 1.58 ± 0.19[1] mas
Distance approx. 2,100 ly
(approx. 630 pc)
Mass 20[5] M
Surface gravity (log g) 3.40±0.08[6] cgs
Temperature 32,983±1,428[6] K
Metallicity [Fe/H] 0.06±0.08[6] dex
Rotational velocity (v sin i) 53[3] km/s
Other designations
19 Cep, BD+61° 2246, HD 209975, HIP 109017, HR 8428, SAO 19849.

19 Cephei is a star in the northern circumpolar constellation of Cepheus.[7] This is a supergiant star[5] with a stellar classification of O9Ib.[3] It is a member of CepOB2, an OB association of massive stars located about 615 parsecs (2,010 ly) from the Sun.[5]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 Vizier catalog entry
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M 
  3. ^ a b c Simón-Díaz, S.; Herrero, A. (2014). "The IACOB project: I. Rotational velocities in northern Galactic O- and early B-type stars revisited. The impact of other sources of line-broadening". Astronomy & Astrophysics 562: A135. arXiv:1311.3360. Bibcode:2014A&A...562A.135S. doi:10.1051/0004-6361/201322758. 
  4. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  5. ^ a b c Villamariz, M. R.; et al. (June 2002), "Chemical composition of Galactic OB stars I. CNO abundances in O9 stars", Astronomy and Astrophysics 388: 940–956, arXiv:astro-ph/0204209, Bibcode:2002A&A...388..940V, doi:10.1051/0004-6361:20020400 
  6. ^ a b c Prugniel, P.; Vauglin, I.; Koleva, M. (2011). "The atmospheric parameters and spectral interpolator for the MILES stars". Astronomy & Astrophysics 531: A165. arXiv:1104.4952. Bibcode:2011A&A...531A.165P. doi:10.1051/0004-6361/201116769. 
  7. ^ "19 CEP (19 Cephei)". Retrieved 28 August 2014. 

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