Pi Persei

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π Persei
Perseus constellation map.svg
Red circle.svg

Location of π Persei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 02h 58m 45.66985s[1]
Declination 39° 39′ 45.8141″[1]
Apparent magnitude (V) 4.70[2]
Spectral type A2Vn[3]
U−B color index +0.12[2]
B−V color index +0.06[2]
Radial velocity (Rv) +14.20[4] km/s
Proper motion (μ) RA: +25.65[1] mas/yr
Dec.: -41.62[1] mas/yr
Parallax (π) 10.53 ± 0.28[1] mas
Distance 310 ± 8 ly
(95 ± 3 pc)
Absolute magnitude (MV) -0.21[5]
Mass 3.02[6] M
Radius 4.8[7] R
Luminosity 170[6] L
Surface gravity (log g) 3.53[8] cgs
Temperature 9,290[6] K
Rotational velocity (v sin i) 186[6] km/s
Other designations
Gorgonea Secunda,[9] 22 Persei, BD+39°681, FK5 2207, GC 3567, HIP 13879, HR 879, HD 18411, SAO 56047
Database references

Pi Persei (π Per) is a star in the constellation Perseus. It also has the traditional name Gorgonea Secunda.

Pi Persei has an apparent magnitude of +4.7[2] and spectral class A2V.[3] The star is about 310 light years from Earth.[1]

In Chinese astronomy, Gorgonea Secunda is called 積屍, Pinyin: Jīshī, meaning Heap of Corpses, because this star is marking itself and stand alone in Heap of Corpses asterism, Stomach mansion (see : Chinese constellation).[10] 積屍 (Jīshī), westernized into Tseih She, and the meaning is "the Piled-up Corpses". R.H. Allen misidentified Tseih She as β Persei (Algol).[11]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ 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. 
  3. ^ 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. 
  4. ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336. 
  5. ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971Freely accessible. doi:10.1134/S1063773712050015.  Vizier catalog entry
  6. ^ a b c d Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars". Astronomy & Astrophysics. 537: A120. Bibcode:2012A&A...537A.120Z. arXiv:1201.2052Freely accessible. doi:10.1051/0004-6361/201117691.  Vizier catalog entry
  7. ^ 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. Bibcode:1999A&A...352..555A. arXiv:astro-ph/9911002Freely accessible.  Vizier catalog entry
  8. ^ 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. Bibcode:2015ApJ...804..146D. arXiv:1501.03154Freely accessible. doi:10.1088/0004-637X/804/2/146.  Vizier catalog entry
  9. ^ Richard Hinckley Allen (1899). Star-names and Their Meanings. G.E. Stechert. pp. 334–. 
  10. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日
  11. ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Perseus