Alpha Sculptoris

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α Sculptoris
Sculptor constellation map.svg
Red circle.svg
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]
Spectral type B7 IIIp[3]
U−B color index −0.515[4]
B−V color index −0.155[4]
Variable type SX Ari[5]
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[1] mas
Distance780 ± 30 ly
(240 ± 10 pc)
Absolute magnitude (MV)−2.58[6]
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

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.


  1. ^ a b c d e f van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb, Astronomisches Rechen-Institut Heidelberg, 35 (35), Bibcode:1999VeARI..35....1W 
  3. ^ Houk, Nancy (1979), "Michigan catalogue of two-dimensional spectral types for the HD stars", Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, 3, 
  4. ^ a b Gutierrez-Moreno, Adelina; et al. (1966), "A System of photometric standards", Publ. Dept. Astron. Univ. Chile, Publicaciones Universidad de Chile, Department de Astronomy, 1: 1–17, Bibcode:1966PDAUC...1....1G 
  5. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S. 
  6. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  7. ^ a b c Kochukhov, O.; Bagnulo, S. (2006). "Evolutionary state of magnetic chemically peculiar stars". Astronomy and Astrophysics. 450 (2): 763. arXiv:astro-ph/0601461Freely accessible. Bibcode:2006A&A...450..763K. doi:10.1051/0004-6361:20054596. 
  8. ^ Shulyak, D.; Paladini, C.; Causi, G. Li; Perraut, K.; Kochukhov, O. (2014). "Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities". Monthly Notices of the Royal Astronomical Society. 443 (2): 1629. arXiv:1406.6093Freely accessible. Bibcode:2014MNRAS.443.1629S. doi:10.1093/mnras/stu1259. 
  9. ^ a b c Saffe, C.; Levato, H. (2014). "On the nature of sn stars. I. A detailed abundance study". Astronomy & Astrophysics. 562: A128. arXiv:1401.5764Freely accessible. Bibcode:2014A&A...562A.128S. doi:10.1051/0004-6361/201322091. 
  10. ^ 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 
  11. ^ "alf Scl". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-04-08. 

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