Article · Wikipedia archive · Last revised Jun 28, 2026

30 Persei

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

Last revised
Jun 28, 2026
Read time
≈ 2 min
Length
410 w
Citations
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Wikipedia ↗
30 Persei
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 17m 47.35287s1
Declination +44° 01′ 30.0800″1
Apparent magnitude (V) 5.492
Characteristics
Spectral type B7 V3
B−V color index −0.060±0.0042
Astrometry
Radial velocity (Rv)+4.0±2.04 km/s
Proper motion (μ) RA: +26.071 mas/yr
Dec.: −24.471 mas/yr
Parallax (π)4.46±0.39 mas1
Distance730 ± 60 ly
(220 ± 20 pc)
Absolute magnitude (MV)−0.962
Orbit3
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)
(secondary)		312±9°
Semi-amplitude (K1)
(primary)		20±3 km/s
Details
30 Per A
Mass4.24±0.125 M☉
Luminosity611+130
−2385 L☉
Temperature9,9086 K
Rotational velocity (v sin i)2125 km/s
Other designations
30 Per, BD+43°674, HD 20315, HIP 15338, HR 982, SAO 387047
Database references
SIMBADdata

30 Persei is a binary star3 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 4.25 times the mass of the Sun and is radiating around 6115 times the Sun's luminosity from its photosphere at an effective temperature of 9,908 K.6

References

References

  1. 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. 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. 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. 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. 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