5 Persei

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5 Persei
Perseus constellation map.svg
Red circle.svg

Location of 5 Persei (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 02h 25m 16.02916s[1]
Declination +56° 36′ 35.3536″[1]
Apparent magnitude (V) +6.35[2]
Spectral type B5 Ia[3]
U−B color index −0.45[2]
B−V color index +0.33[2]
Proper motion (μ) RA: −0.71 ± 0.48[1] mas/yr
Dec.: −1.55 ± 0.44[1] mas/yr
Parallax (π) 0.64 ± 0.36[4] mas
Distance 2950+388
[5] pc
Absolute magnitude (MV) −6.7[6]
Luminosity 83,000[7] L
Surface gravity (log g) 2.00[7] cgs
Temperature 15,000[7] K
Rotational velocity (v sin i) 30[7] km/s
Other designations
5 Per, HR 627, HD 13267, BD+56°438, HIP 10227
Database references

5 Persei is a blue supergiant star in the constellation Perseus located around 2,950 parsecs (9,600 ly) away. It is part of the Perseus OB1 stellar association and lies near the Double Cluster.


5 Persei has two close companions, a 12th magnitude star 5.7 arc-seconds away and a 13th magnitude star one arc-minute away.[8]


Several studies of 5 Persei have detected possible small amplitude variations. In 1983, an amplitude of 0.045 magnitudes was measured with a possible period of eight days.[6] An analysis of Hipparcos photometry showed an amplitude of 0.0168 magnitudes and a period of 2.65 days. The statistical signal was strong enough for the variability to be very likely, but 5 Persei has not formally been catalogued as a variable star.[9]


The primary, with an apparent magnitude of 6.27, is a blue supergiant of spectral type B5 Ia, a massive star that has used up its core hydrogen and expanded into a very luminous star. It has a temperature around 15,000 K.


  1. ^ a b c d van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752free to read. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b c 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: 0. Bibcode:2002yCat.2237....0D. 
  3. ^ Grenier, S.; Baylac, M.-O.; Rolland, L.; Burnage, R.; Arenou, F.; Briot, D.; Delmas, F.; Duflot, M.; Genty, V.; Gómez, A. E.; Halbwachs, J.-L.; Marouard, M.; Oblak, E.; Sellier, A. (1999). "Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS". Astronomy and Astrophysics Supplement. 137 (3): 451. Bibcode:1999A&AS..137..451G. doi:10.1051/aas:1999489. 
  4. ^ Gaia Collaboration (2016). "VizieR Online Data Catalog: Gaia DR1 (Gaia Collaboration, 2016)". VizieR On-line Data Catalog: I/337. Originally published in: Astron. Astrophys. 1337. Bibcode:2016yCat.1337....0G. 
  5. ^ Galazutdinov, G.; Strobel, A.; Musaev, F. A.; Bondar, A.; Krełowski, J. (2015). "The Structure and Kinematics of the Galaxy Thin Gaseous Disk Outside the Solar Orbit". Publications of the Astronomical Society of Pacific. 127 (948): 126. Bibcode:2015PASP..127..126G. doi:10.1086/680211. 
  6. ^ a b Percy, J. R.; Welch, D. L. (1983). "Photometric variability of B- and A-type supergiants". Astronomical Society of the Pacific. 95: 491. Bibcode:1983PASP...95..491P. doi:10.1086/131198. 
  7. ^ a b c d McErlean, N. D.; Lennon, D. J.; Dufton, P. L. (1999). "Galactic B-supergiants: A non-LTE model atmosphere analysis to estimate atmospheric parameters and chemical compositions". Astronomy and Astrophysics. 349: 553. Bibcode:1999A&A...349..553M. 
  8. ^ 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. 
  9. ^ Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331: 45. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x.