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4 Persei
	Location of 4 Persei (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Perseus
Right ascension	02h 02m 18.11081s
Declination	54° 29′ 15.1488″
Apparent magnitude (V)	5.04
Characteristics
Spectral type	B8 III
U−B color index	−0.32
B−V color index	−0.08
Astrometry
Radial velocity (Rv)	−2.30 km/s
Proper motion (μ)	RA: +32.886 mas/yr ; Dec.: −3.515 mas/yr
Parallax (π)	4.2743 ± 0.1856 mas
Distance	760 ± 30 ly ; (230 ± 10 pc)
Absolute magnitude (MV)	−1.75
Details
Radius	3.2 R☉
Luminosity	670 L☉
Surface gravity (log g)	4.19 cgs
Temperature	12,230 K
Metallicity [Fe/H]	+0.30 dex
Rotational velocity (v sin i)	60 km/s
Other designations
	g Persei, 4 Per, BD+53°439, FK5 1054, GC 2442, HD 12303, HIP 9505, HR 590, SAO 22859
Database references
SIMBAD	data

4 Persei is a single^[10] star in the northern constellation of Perseus, located around 670 light years away from the Sun.^[1] It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.04^[2] The Bayer designation for this star is g Persei; 4 Persei is the Flamsteed designation. This object has a peculiar velocity of 26.3 km/s and may be a runaway star.^[11]

The stellar classification for 4 Persei is B8 III,^[3] matching an aging B-type giant star that has evolved off the main sequence. It is spinning with a projected rotational velocity of 60 km/s^[8] and has about 3.2^[6] times the Sun's radius The star is radiating 670^[5] times the luminosity of the Sun from its photosphere at an effective temperature of 12,230 K.^[7] 4 Persei is embedded in a small, relatively dense dust cloud, which is resulting in infrared emission from the cold dust.^[12]

References

^ ^a ^b ^c ^d ^e ^f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^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.
^ ^a ^b 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.
^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
^ ^a ^b ^c 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. Vizier catalog entry
^ ^a ^b Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics. 367 (Third ed.): 521–524. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
^ ^a ^b ^c ^d Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. arXiv:1009.1491. Bibcode:2011A&A...525A..71W. doi:10.1051/0004-6361/201015014. S2CID 53480665.
^ ^a ^b Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
^ "4 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-27.
^ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ 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
^ Tovmassian, H. M.; et al. (February 1995), "Dust Shells of Distant Young Stars", Astrophysics and Space Science, 224 (1–2): 577–578, Bibcode:1995Ap&SS.224..577T, doi:10.1007/BF00667963, S2CID 189848223