Star in the constellation of Scorpius
N Scorpii Location of N Scorpii on the map
Observation dataEpoch J2000 Equinox J2000 Constellation Scorpius Right ascension 16h 31m 22.93300s [ 1] Declination −34° 42′ 15.7146″[ 1] Apparent magnitude (V)4.23[ 2] Characteristics Spectral type B2 III-IV[ 3] U−Bcolor index −0.76[ 2] B−Vcolor index −0.17[ 2] Variable type candidateβ Cephei [ 4] Astrometry Radial velocity (Rv )0.8± 1.5[ 5] km/s Proper motion (μ)RA: −12.05± 0.20mas /yr [ 1] Dec.: −18.16± 0.13mas /yr [ 1] Parallax (π)5.88± 0.19 mas [ 1] Distance 550 ± 20 ly pc ) Absolute magnitude (MV )−1.91[ 6] Details Mass 7.8± 0.1[ 7] M ☉ Radius 6.25[ 8] R ☉ Luminosity (bolometric) 6,918[ 9] L ☉ Surface gravity (log g )4.0[ 9] cgs Temperature 21,877[ 9] K Metallicity [Fe/H] +0.01[ 10] dex Rotational velocity (v sin i )70± 8[ 11] Age 22± 4[ 7] Myr Other designations N Scorpii ,72 G. Scorpii [ 12] CD −34°11044CPD −34°6528FK5 1431GC 22195HD 148703HIP 80911HR 6143SAO 207732[ 13] Database references SIMBAD data
N Scorpii , also known asHD 148703 , is a solitary,[ 14] star located in the southernconstellation Scorpius . It has anapparent magnitude of 4.23, making it readily visible to thenaked eye . N Scorpii was initially given theBayer designation Alpha Normae byLacaille but it was later moved fromNorma to Scorpius.[ 15] light years away based onparallax measurements from theHipparcos satellite and is part of the Upper Scorpius–Centaurus region of theScorpius–Centaurus association .[ 16]
N Scorpii has been given severalstellar classifications over the years. It has been given theluminosity class of amain sequence star (V),[ 17] subgiant (IV),[ 18] giant star (III),[ 19] [ 3] Sun . HD 148703 is a candidateβ Cephei variable [ 4] [ 20] projected rotational velocity .[ 21] B-type stars .[ 22]
The object has two generally accepted classes: B2 III-IV and B2 IV. It has 7.8 times themass of the Sun [ 7] size .[ 8] bolometric luminosity 6,918 times greater than the Sun from itsphotosphere at aneffective temperature ofK [ 9] million years old,[ 7] projected rotational velocity ofkm/s [ 11]
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