Star in the constellation Perseus
Pi Persei
Location of π Persei (circled)
Observation dataEpoch J2000 Equinox J2000
Constellation
Perseus
Right ascension 02h 58m 45.66858s [ 1]
Declination
+39° 39′ 45.8212″[ 1]
Apparent magnitude (V)4.70[ 2]
Characteristics
Spectral type
A2Vn[ 3]
U−B color index
+0.12[ 2]
B−V color index
+0.06[ 2]
Astrometry Radial velocity (Rv )+14.2[ 4] km/s Proper motion (μ) RA: +26.224[ 1] mas /yr Dec.: −41.899[ 1] mas /yr Parallax (π)10.7797± 0.2794 mas [ 1] Distance 303 ± 8 ly pc ) Absolute magnitude (MV )−0.21[ 5] Details Mass 2.07[ 6] M ☉ Radius 4.8[ 7] R ☉ Luminosity 170[ 8] L ☉ Surface gravity (log g )3.53[ 6] cgs Temperature 9,290[ 8] K Rotational velocity (v sin i )186[ 8] Age 272[ 6] Myr Other designations Gorgonea Secunda[ 9] π Per , 22 Persei , BD +39°681FK5 2207GC 3567HD 18411HIP 13879HR 879SAO 56047[ 10] Database references SIMBAD data
π Persei , Latinized as Pi Persei , is a single[ 11] star in the northern constellation of Perseus . It has the traditional name Gorgonea Secunda , the second of three Gorgons in the mythology of the hero Perseus .[ 12] apparent visual magnitude of +4.7.[ 2] light years from the Sun based on parallax ,[ 1] radial velocity of +14 km/s.[ 4]
This object is an A-type main-sequence star with a stellar classification of A2Vn,[ 3] lines due to rapid rotation. It is spinning with a projected rotational velocity of 186 km/s,[ 8] equatorial bulge that is 6% wider than the polar radius.[ 13] [ 6] mass of the Sun .[ 6] [ 7] Sun's radius and is radiating 170[ 8] luminosity of the Sun from its photosphere at an effective temperature of 9,290 K.[ 8]
In Chinese astronomy , this star is named Jīshī (Chinese : 積屍 ), meaning Heap of Corpses .[ 14] R. H. Allen transliterated this name as Tseih She and wrongly identified it with Algol .[ 9] [ 15]
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 Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars" . Astrophysical Journal Supplement . 99 : 135. Bibcode :1995ApJS...99..135A . doi :10.1086/192182 ^ a b Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication . Carnegie Institution for Science . Bibcode :1953GCRV..C......0W . ISBN 9780598216885 LCCN 54001336 . ^ 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 c d e David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal . 804 (2): 146. arXiv :1501.03154 Bibcode :2015ApJ...804..146D . doi :10.1088/0004-637X/804/2/146 . S2CID 33401607 . Vizier catalog entry ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics . 352 : 555– 562. arXiv :astro-ph/9911002 Bibcode :1999A&A...352..555A . Vizier catalog entry ^ a b c d e f Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics . 537 : A120. arXiv :1201.2052 Bibcode :2012A&A...537A.120Z . doi :10.1051/0004-6361/201117691 . S2CID 55586789 . Vizier catalog entry ^ a b Allen, Richard Hinckley (1899). Star-names and Their Meanings 334 . here ^ "pi Per" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-10-12 .^ Eggleton, P. P.; Tokovinin, A. A. (September 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 . ^ Kaler, James B. (November 21, 2014). "Pi Persei" . STARS . Retrieved 2019-10-12 . ^ van Belle, Gerard T. (March 2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review . 20 (1) 51. arXiv :1204.2572 Bibcode :2012A&ARv..20...51V . doi :10.1007/s00159-012-0051-2 . S2CID 119273474 . ^ "AEEA 天文教育資訊網" [Activities of Exhibition and Education in Astronomy] (in Chinese). Archived from the original on 24 March 2008.^ Ridpath, Ian . "Star Tales - Perseus" . Retrieved 22 July 2025 .
