Epoch J2000.0 Equinox J2000.0
|Right ascension||00h 58m 36.35930s|
|Declination||−29° 21′ 26.8247″|
|Apparent magnitude (V)||+4.30|
|Spectral type||B7 IIIp|
|U−B color index||−0.515|
|B−V color index||−0.155|
|Variable type||SX Ari|
|Radial velocity (Rv)||+10.2 km/s|
|Proper motion (μ)||RA: +20.13 mas/yr
Dec.: +5.31 mas/yr
|Parallax (π)||4.20 ± 0.18 mas|
|Distance||780 ± 30 ly
(240 ± 10 pc)
|Surface gravity (log g)||3.60 cgs|
|Metallicity [Fe/H]||0.90 dex|
|Rotational velocity (v sin i)||20 km/s|
Alpha Sculptoris (α Scl, α Sculptoris) is the Bayer designation for a star in the southern constellation of Sculptor. It has an apparent visual magnitude of +4.30, which makes it the brightest star in this generally faint constellation. Parallax measurements collected during the Hipparcos mission provide a distance estimate for this star, placing it at roughly 780 light-years (240 parsecs), with a 4% margin of error.
The luminosity of α Scl is around 1700 times that of the Sun while its surface temperature is 14,000 kelvins. The radius of Alpha Sculptoris is calculated to be 7 times solar while its mass is 5.5 times that of the Sun. Spectral variations observed in this star where once believed to be caused by an orbiting black hole but are now known to be the result of chemical variations in its atmosphere.
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- Schmitt, A. (March 1973), "The weak-helium-line star α Sculptoris. I. The line-spectrum", Astronomy and Astrophysics Supplement, 9: 427, Bibcode:1973A&AS....9..427S
- Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590
- "alf Scl -- Rotationally variable Star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-04-08
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