Back Pi Persei AST Pi Persei Spanish پی برساووش Persian Pi Persei ID ペルセウス座パイ星 Japanese Gorgonea Secunda Dutch Pi Persei Polish Pi Persei Portuguese Gorgonea Secunda Swedish 积尸 Chinese

Pi Persei

Pi Persei
Location of π Persei (circled)
Observation data
Epoch 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]
Distance303 ± 8 ly
(93 ± 2 pc)
Absolute magnitude (MV)−0.21[5]
Details
Mass2.07[6] M☉
Radius4.8[7] R☉
Luminosity170[8] L☉
Surface gravity (log g)3.53[6] cgs
Temperature9,290[8] K
Rotational velocity (v sin i)186[8] km/s
Age272[6] Myr
Other designations
Gorgonea Secunda[9], π Per, 22 Persei, BD+39°681, FK5 2207, GC 3567, HD 18411, HIP 13879, HR 879, SAO 56047[10]
Database references
SIMBADdata

π Persei, Latinized as Pi Persei, is a single[11] star in the northern constellation of Perseus. It has the traditional name Gorgonea Secunda /ɡɔːrɡəˈniːə sɪˈkʌndə/, the second of three Gorgons in the mythology of the hero Perseus.[12] This star has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.7.[2] It is located at a distance of approximately 303 light years from the Sun based on parallax,[1] and is moving further away with a radial velocity of +14 km/s.[4]

This object is an A-type main-sequence star with a stellar classification of A2Vn,[3] where the 'n' suffix indicates broad (nebulous) lines due to rapid rotation. It is spinning with a projected rotational velocity of 186 km/s,[8] which is creating an equatorial bulge that is 6% wider than the polar radius.[13] The star is 272[6] million years old with double the mass of the Sun.[6] It has 4.8[7] times the Sun's radius and is radiating 170[8] times the luminosity of the Sun from its photosphere at an effective temperature of 9,290 K.[8]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference abt1995 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference XHIP was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference AllendePrieto was invoked but never defined (see the help page).
  8. ^ a b c d e f Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Allen1899 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Kaler was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).
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