9 Persei

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9 Persei
Perseus constellation map.svg
Red circle.svg

Location of 9 Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 02h 22m 21.43510s[1]
Declination 55° 50′ 44.3472″[1]
Apparent magnitude (V) 5.17[2]
Spectral type A2Ia[3]
U−B color index -0.11[2]
B−V color index +0.37[2]
Variable type α Cyg[4]
Radial velocity (Rv) -15.20[5] km/s
Proper motion (μ) RA: +0.86[1] mas/yr
Dec.: -1.78[1] mas/yr
Parallax (π) 1.00 ± 0.30[1] mas
Distance approx. 3,300 ly
(approx. 1,000 pc)
Absolute magnitude (MV) −4.73[6]
Mass 10.5[7] M
Luminosity 6387[8] L
Surface gravity (log g) 1.74[9] cgs
Temperature 9,840[10] K
Metallicity [Fe/H] +0.26[9] dex
Rotational velocity (v sin i) 25[3] km/s
Other designations
i Persei, V474 Per, BD+55°598, CCDM J02224+5551A, FK5 2159, GC 2836, HIP 11060, HR 685, HD 14489, SAO 23256, WDS J02224+5551A
Database references
The Double Cluster. 9 Persei is the brightest star right side of the image. North is to the left.

9 Persei is a pulsating variable star in the constellation Perseus. Its apparent magnitude is 5.17.[2] Located around 1,000 parsecs (3,300 ly) distant,[1] it is a blue supergiant of spectral type A2Ia,[3] a massive star that has used up its core hydrogen and is now fusing heavier elements.

It has one companion, B, at separation 12.3" and magnitude 12.0.[11]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D. 
  3. ^ a b c Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H. 
  4. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....1.2025S. 
  5. ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336. 
  6. ^ Huang, W.; et al. (2012), "A catalogue of Paschen-line profiles in standard stars", Astronomy & Astrophysics, 547: A62, Bibcode:2012A&A...547A..62H, arXiv:1210.7893Freely accessible, doi:10.1051/0004-6361/201219804. 
  7. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. Bibcode:2011MNRAS.410..190T. arXiv:1007.4883Freely accessible. doi:10.1111/j.1365-2966.2010.17434.x.  Vizier catalog entry
  8. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427: 343. Bibcode:2012MNRAS.427..343M. arXiv:1208.2037Freely accessible. doi:10.1111/j.1365-2966.2012.21873.x.  Vizier catalog entry
  9. ^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. Bibcode:2011A&A...525A..71W. arXiv:1009.1491Freely accessible. doi:10.1051/0004-6361/201015014. 
  10. ^ Zorec, J.; Cidale, L.; Arias, M. L.; Frémat, Y.; Muratore, M. F.; Torres, A. F.; Martayan, C. (2009). "Fundamental parameters of B supergiants from the BCD system". Astronomy and Astrophysics. 501: 297. Bibcode:2009A&A...501..297Z. arXiv:0903.5134Freely accessible. doi:10.1051/0004-6361/200811147. 
  11. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.  Vizier catalog entry