V957 Scorpii
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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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
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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] |
Distance | 890 ± 40 ly (270 ± 10 pc) |
Absolute magnitude (MV) | −1.441[6] |
Details | |
Mass | 5.13[7] M☉ |
Radius | 4.00[7] R☉ |
Luminosity | 1,148[7] L☉ |
Surface gravity (log g) | 3.94[7] cgs |
Temperature | 16,600[7] K |
Metallicity [Fe/H] | +0.01[8] dex |
Rotational velocity (v sin i) | 30[9] km/s |
Age | 50[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
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