Alpha Sculptoris

α Sculptoris
Location of α Sculptoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sculptor
Right ascension 00h 58m 36.35930s[1]
Declination −29° 21′ 26.8247″[1]
Apparent magnitude (V) +4.30[2]
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[2] km/s
Proper motion (μ) RA: +20.13[1] mas/yr
Dec.: +5.31[1] mas/yr
Parallax (π)4.20 ± 0.18 mas[1]
Distance780 ± 30 ly
(240 ± 10 pc)
Absolute magnitude (MV)−2.58[6]
Details
Mass5.01[7] M☉
Radius7.52[8] R☉
Luminosity1,549[7] L☉
Surface gravity (log g)3.20[9] cgs
Temperature13,600[9] K
Metallicity [Fe/H]0.90[10] dex
Rotational velocity (v sin i)17[9] km/s
Age93[7] Myr
Other designations
α Scl, CD−30°297, FK5 35, HD 5737, HIP 4577, HR 280, SAO 166716[11]
Database references
SIMBADdata

Alpha Sculptoris, Latinized from α Sculptoris, is the Bayer designation for a blue-white star in the southern constellation of Sculptor. It has an apparent visual magnitude of +4.30,[2] 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.[1]

Alpha Sculptoris is a B-type giant star. It is classified as an SX Arietis type variable star and its magnitude varies by less than a tenth of a magnitude.[5]

The luminosity of α Scl is around 1,500 times that of the Sun while its surface temperature is 13,600 K. The radius of Alpha Sculptoris is calculated to be seven times solar while its mass is five times that of the Sun.

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