Alpha Sculptoris
star in the southern constellation of Sculptor / From Wikipedia, the free encyclopedia
Alpha Sculptoris is the brightest star in the generally faint constellation Sculptor, it is the brightest star in the constellation because it has an apparent visual magnitude of +4.30.[1] Parallax measurements collected during the Hipparcos mission give an estimated distance for this star at about 780 light-years (240 parsecs), with a 4% margin of error.[2]
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Sculptor |
Right ascension | 00h 58m 36.35930s[2] |
Declination | −29° 21′ 26.8247″[2] |
Apparent magnitude (V) | +4.30[1] |
Characteristics | |
Spectral type | B7 IIIp[3] |
U−B color index | −0.515[4] |
B−V color index | −0.155[4] |
Variable type | SX Ari[5] |
Astrometry | |
Radial velocity (Rv) | +10.2[1] km/s |
Proper motion (μ) | RA: +20.13[2] mas/yr Dec.: +5.31[2] mas/yr |
Parallax (π) | 4.20 ± 0.18[2] mas |
Distance | 780 ± 30 ly (240 ± 10 pc) |
Absolute magnitude (MV) | −2.58[6] |
Details | |
Mass | 5.01[7] M☉ |
Radius | 7.52[8] R☉ |
Luminosity | 1,549[7] L☉ |
Surface gravity (log g) | 3.20[9] cgs |
Temperature | 13,600[9] K |
Metallicity [Fe/H] | 0.90[10] dex |
Rotational velocity (v sin i) | 17[9] km/s |
Age | 93[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Close
Alpha Sculptoris is a B-type giant star. It is classified as an SX Arietis type variable star. It's magnitude changes by less than a tenth of a magnitude.[5]
The luminosity of Alpha Sculptoris is about 1,500 times brighter than that of the Sun and is very hot with a surface temperature of 13,600 K. It is 7 times larger than the Sun in radius and is 5 times massive than the Sun.