Zeta Persei

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ζ Persei
Perseus constellation map.svg
Red circle.svg
Location of ζ Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 54m 07.92248s[1]
Declination +31° 53′ 01.0812″[1]
Apparent magnitude (V) 2.86[2]
Spectral type B1 Ib[3]
U−B color index –0.72[2]
B−V color index +0.10[2]
Radial velocity (Rv)20.1 ± 1.2[4] km/s
Proper motion (μ) RA: +5.77[1] mas/yr
Dec.: –9.92[1] mas/yr
Parallax (π)4.34 ± 0.19 mas[1]
Distance750 ± 30 ly
(230 ± 10 pc)
Absolute magnitude (MV)−3.91[5]
Mass14.5 ± 1.9[6] M
Radius26–27[7] R
Luminosity47,039[6] L
Temperature20,800[6] K
Rotation2.9–17.3 days[citation needed]
Rotational velocity (v sin i)40[3] km/s
Age12.6 ± 1.5[8] Myr
Other designations
44 Per, FK5 144, HD 24398, HIP 18246, HR 1203, SAO 56799.[9]
Database references

Zeta Persei (ζ Per, ζ Persei) is a star in the northern constellation of Perseus. With an apparent visual magnitude of 2.9,[2] it can be readily seen with the naked eye. Parallax measurements place it at a distance of about 750 light-years (230 parsecs) from Earth.[1]


This is a lower luminosity supergiant star with a stellar classification of B1 Ib.[3] This is an enormous star, with an estimated 26–27[7] times the Sun's radius and 13–16 times the Sun's mass.[7] It has about 47,000 times the luminosity of the Sun and it is radiating this energy at an effective temperature of 20,800 K,[6] giving it the blue-white hue of a B-type star.[10] The spectrum displays anomalously high levels of carbon.[11] Zeta Persei has a strong stellar wind that is expelling 0.23 × 10−6 times the mass of the Sun per year, or the equivalent of the Sun's mass every 4.3 million years.[12]

Zeta Persei has a 9th magnitude companion at an angular separation of 12.9 arcseconds. The two stars have the same proper motion, so they may be physically associated. If so, they are separated by at least 4,000 Astronomical Units.[13] Zeta Persei is a confirmed member of the Perseus OB2 association (Per OB2), also called the Zeta Persei association, which is a moving group of stars that includes 17 massive, high luminosity members with spectral types of O or B, giving them a blue hue. These stars have a similar trajectory through space,[4] suggesting they originated in the same molecular cloud and are about the same age.[14]


Some sources, including Starry Night (planetarium software), an atlas,[15] and a web site[16] attribute the name 'Atik' to Zeta Persei instead of nearby Omicron Persei.

See also[edit]


  1. ^ a b c d e f van Leeuwen, F. (November 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, S2CID 18759600
  2. ^ a b c d Lutz, T. E.; Lutz, J. H. (June 1977), "Spectral classification and UBV photometry of bright visual double stars", Astronomical Journal, 82: 431–434, Bibcode:1977AJ.....82..431L, doi:10.1086/112066
  3. ^ a b c Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590
  4. ^ a b Steenbrugge, K. C.; et al. (May 2003), "Radial velocities of early-type stars in the Perseus OB2 association", Astronomy and Astrophysics, 402 (2): 587–605, arXiv:astro-ph/0302428, Bibcode:2003A&A...402..587S, doi:10.1051/0004-6361:20030277, S2CID 15771155
  5. ^ Huang, W.; et al. (2012), "A catalogue of Paschen-line profiles in standard stars", Astronomy & Astrophysics, 547: A62, arXiv:1210.7893, Bibcode:2012A&A...547A..62H, doi:10.1051/0004-6361/201219804, S2CID 119286159.
  6. ^ a b c d Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355, S2CID 111387483
  7. ^ a b c Pasinetti-Fracassini, L. E.; et al. (February 2001) [November 2000 (arXiv)], "Catalogue of Stellar Diameters (CADARS)", Astronomy and Astrophysics, 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754
  8. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873
  9. ^ "zet Per -- Variable Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-12
  10. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, retrieved 2012-01-16
  11. ^ Jaschek, M.; Jaschek, C. (December 1974), "The CNO stars", Astronomy and Astrophysics, 36 (3): 401–408, Bibcode:1974A&A....36..401J
  12. ^ Morel, T.; et al. (June 2004), "Large-scale wind structures in OB supergiants: a search for rotationally modulated Hα variability", Monthly Notices of the Royal Astronomical Society, 351 (2): 552–568, arXiv:astro-ph/0403155, Bibcode:2004MNRAS.351..552M, doi:10.1111/j.1365-2966.2004.07799.x, S2CID 17740309
  13. ^ Burnham, Robert (1978), Burnham's celestial handbook: an observer's guide to the universe beyond the solar system, Dover books explaining science, vol. 3 (2nd ed.), Courier Dover Publications, p. 1422, ISBN 0-486-23673-0
  14. ^ de Zeeuw, P. T.; et al. (January 1999), "A HIPPARCOS Census of the Nearby OB Associations", The Astronomical Journal, 117 (1): 354–399, arXiv:astro-ph/9809227, Bibcode:1999AJ....117..354D, doi:10.1086/300682, S2CID 16098861
  15. ^ Mullaney, James & Tirion, Wil (2009). The Cambridge Double Star Atlas, Chart 7. University Press, Cambridge. ISBN 978-0-521-49343-7.
  16. ^ Your Sky Object Catalogue: Named Stars

External links[edit]

  • Kaler, James B., "Zeta Persei", Stars, University of Illinois, retrieved 2012-01-12