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).