V957 Scorpii

V957 Scorpii
Location of V957 Scorpii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 17h 52m 13.662s[1]
Declination −34° 47′ 57.11″[1]
Apparent magnitude (V) 5.87[2]
Characteristics
Spectral type B5 IIIp[3]
U−B color index −0.64[4]
B−V color index −0.10[4]
Variable type SX Ari[2]
Astrometry
Radial velocity (Rv)−9.70[5] km/s
Proper motion (μ) RA: 3.148[1] mas/yr
Dec.: −5.604[1] mas/yr
Parallax (π)3.6766 ± 0.1521 mas[1]
Distance890 ± 40 ly
(270 ± 10 pc)
Absolute magnitude (MV)−1.441[6]
Details
Mass5.13[7] M☉
Radius4.00[7] R☉
Luminosity1,148[7] L☉
Surface gravity (log g)3.94[7] cgs
Temperature16,600[7] K
Metallicity [Fe/H]+0.01[8] dex
Rotational velocity (v sin i)30[9] km/s
Age50[7] Myr
Other designations
V957 Sco, HR 6647, HD 162374, CD−34°12165, SAO 209383, HIP 87460
Database references
SIMBADdata

V957 Scorpii is a variable star in the constellation of Scorpius. It is a blue straggler in the open cluster Messier 7, a star that is unexpectedly hot compared to other members of the cluster.

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