Sigma Sculptoris

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Sigma Sculptoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sculptor
Right ascension 01h 02m 26.43280s[1]
Declination −31° 33′ 07.2237″[1]
Apparent magnitude (V) +5.54[2]
Spectral type A1/A2 IV[3]
U−B color index +0.13[2]
B−V color index +0.06[2]
Variable type α2 CVn[4]
Radial velocity (Rv) −15.40±0.50[5] km/s
Proper motion (μ) RA: +80.50[1] mas/yr
Dec.: +14.64[1] mas/yr
Parallax (π) 14.04 ± 0.32[1] mas
Distance 232 ± 5 ly
(71 ± 2 pc)
Mass 2.07[6] M
Radius 2.2[7] R
Luminosity 25.7[8] L
Surface gravity (log g) 4.02±0.14[6] cgs
Temperature 9,005±306[6] K
Rotational velocity (v sin i) 82.1±1.2[9] km/s
Age 464[6] Myr
Other designations
σ Scl, CD−32° 410, HD 6178, HIP 4852, HR 293, SAO 192884[10]
Database references

Sigma Sculptoris (σ Scl, σ Sculptoris) is a solitary[11] star in the southern constellation of Sculptor. It is faintly visible to the naked eye with an apparent visual magnitude of +5.54.[2] Based upon an annual parallax shift of 14.04 mas as seen from Earth,[1] it is located about 232 light years from the Sun.

This is a white-hued A-type subgiant with a stellar classification of A1/A2 IV.[3] It is a suspected Ap star and is classified as an Alpha2 Canum Venaticorum variable[4] with a periodicity of 2.37 days.[12] The star has an estimated 2.07[6] the mass of the Sun and around 2.2[7] times the Sun's radius. It is spinning with a projected rotational velocity of 82 km/s[9] and is about 464 million years old.[6] Sigma Sculptoris radiates 25.7[8] times the solar luminosity from its photosphere at an effective temperature of 9005 K.[6]

See also[edit]

Sigma Sculptoris in fiction


  1. ^ a b c d e f van Leeuwen, F. (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 d Westerlund, B. E. (1963), "Three-colour photometry of early-type stars near the galactic poles", Monthly Notices of the Royal Astronomical Society, 127: 83, Bibcode:1963MNRAS.127...83W, doi:10.1093/mnras/127.1.83. 
  3. ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982MSS...C03....0H. 
  4. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. 1. Bibcode:2009yCat....102025S. 
  5. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  6. ^ a b c d e f g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154Freely accessible, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146. 
  7. ^ a b Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (3rd ed.), 367: 521–524, arXiv:astro-ph/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  8. ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  9. ^ a b Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, arXiv:1012.4858Freely accessible, Bibcode:2011A&A...531A.143D, doi:10.1051/0004-6361/201016386. 
  10. ^ "sig Scl -- Variable Star of alpha2 CVn type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-04-13. 
  11. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  12. ^ Catalano, F. A.; Renson, P. (February 1998), "The observed periods of AP and BP stars", Astronomy and Astrophysics Supplement, 127: 421−422, Bibcode:1998A&AS..127..421C, doi:10.1051/aas:1998110.