30 Persei


30 Persei
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 17m 47.35287s[1]
Declination +44° 01′ 30.0800″[1]
Apparent magnitude (V) 5.49[2]
Spectral type B7 V[3]
B−V color index −0.060±0.004[2]
Radial velocity (Rv)+4.0±2.0[4] km/s
Proper motion (μ) RA: +26.07[1] mas/yr
Dec.: −24.47[1] mas/yr
Parallax (π)4.46 ± 0.39[1] mas
Distance730 ± 60 ly
(220 ± 20 pc)
Absolute magnitude (MV)−0.96[2]
Period (P)36.5±0.1 d
Eccentricity (e)0.3±0.2
Periastron epoch (T)24,407,531.7±0.1
Argument of periastron (ω)
Semi-amplitude (K1)
20±3 km/s
30 Per A
Mass4.24±0.12[5] M
[5] L
Temperature9,908[6] K
Rotational velocity (v sin i)212[5] km/s
Other designations
30 Per, BD+43° 674, HD 20315, HIP 15338, HR 982, SAO 38704[7]
Database references

30 Persei is a binary star[3] system in the northern constellation Perseus. It is faintly visible to the naked eye with an apparent visual magnitude of 5.49.[2] Based upon an annual parallax shift of 4.46±0.39 mas,[1] is located roughly 730 light years from the Sun. It is a member of the Perseus OB3 association, which includes the Alpha Persei Cluster.[8]

This is a single-lined spectroscopic binary star system with an orbital period of 36.5 days and an eccentricity of roughly 0.3. The visible component is a B-type main-sequence star with a stellar classification of B7 V.[3] It is spinning rapidly with a projected rotational velocity of 212 km/s.[5] The star has 4.2[5] times the mass of the Sun and is radiating around 611[5] times the Sun's luminosity from its photosphere at an effective temperature of 9,908 K.[6]


  1. ^ a b c d e f 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, S2CID 18759600.
  2. ^ a b c d 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, S2CID 119257644.
  3. ^ a b c d Morrell, Nidia; Abt, Helmut A. (July 10, 1992), "Spectroscopic binaries in the Alpha Persei cluster", Astrophysical Journal, Part 1, 393 (2): 666–673, Bibcode:1992ApJ...393..666M, doi:10.1086/171534.
  4. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  5. ^ a b c d e f Zorec, J.; Royer, F. (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, S2CID 55586789.
  6. ^ a b McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  7. ^ "30 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-08.
  8. ^ Hoogerwerf, Ronnie (March 2000), "OB association members in the ACT and TRC catalogues", Monthly Notices of the Royal Astronomical Society, 313 (1): 43–65, Bibcode:2000MNRAS.313...43H, doi:10.1046/j.1365-8711.2000.03192.x