Star in the constellation Perseus
40 Persei Location of 40 Persei (circled)
Observation dataEpoch J2000 Equinox J2000 Constellation Perseus Right ascension 03h 42m 22.64555s [ 1] Declination +33° 57′ 54.0893″[ 1] Apparent magnitude (V)4.97[ 2] Characteristics Spectral type B0.5V[ 3] [ 4] U−Bcolor index −0.84[ 5] B−Vcolor index +0.00[ 5] Astrometry Radial velocity (Rv )+22.00[ 6] km/s Proper motion (μ)RA: +2.71[ 1] mas /yr Dec.: −5.91[ 1] mas /yr Parallax (π)3.09± 0.21 mas [ 1] Distance 1,060 ± 70 ly pc ) Absolute magnitude (MV )−2.26[ 2] Details 40 Per A Mass 12.5[ 7] M ☉ Luminosity 936[ 2] L ☉ Surface gravity (log g )4.36[ 8] cgs Temperature 29,330[ 9] K Metallicity [Fe/H] −0.43[ 2] dex Rotational velocity (v sin i )10[ 10] Age 7.2[ 11] Myr Other designations 40 Per ,BD +33°698GC 4420HD 22951HIP 17313HR 1123SAO 56646CCDM J03424+3358AWDS J03424+3358A[ 12] Database references SIMBAD data
40 Persei is a widebinary star [ 13] constellation ofPerseus . It has theBayer designation ο Persei , while40 Persei is theFlamsteed designation . The system is visible to the naked eye as a faint, blue-white hued point of light with anapparent visual magnitude of 4.97.[ 2] light years away from the Sun based onparallax ,[ 1] radial velocity of +22 km/s.[ 6] [ 14]
The primary component is a massiveB-type main-sequence star with astellar classification of B0.5V.[ 3] [ 11] projected rotational velocity for anearly B-type star,[ 15] [ 10] [ 7] mass of the Sun and is radiating 936[ 2] Sun's luminosity from itsphotosphere at aneffective temperature of 29,330 K.[ 9] A-type main-sequence star with a class of A1Vn, and is located at anangular separation of″ [ 4]
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