9 Persei

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9 Persei
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Perseus
Right ascension 02h 22m 21.43510s [1]
Declination +55° 50′ 44.3472″ [1]
Spectral type A2Ia

9 Persei is a pulsating variable star in the constellation Perseus. Its apparent magnitude is 5.21. Located around 1,000 parsecs (3,300 ly) distant, it is a blue supergiant of spectral type A2Ia,[1] a massive star that has used up its core hydrogen and is now fusing heavier elements.


  1. ^ a b c "V474 Persei". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 25 December 2013.