Theta Sculptoris

θ Sculptoris, Latinized as Theta Sculptoris, is a star in the southern constellation of Sculptor. This object is visible to the naked eye as a dim, yellow-white hued star with an apparent visual magnitude of +5.24.[2] It is located 71 light years from the Sun based on parallax.[1] The object is drifting closer with a radial velocity of −21 km/s, and may come to within 49 light-years in half a million years.[4]

Theta Sculptoris
Location of θ Sculptoris (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sculptor
Right ascension 00h 11m 44.02079s[1]
Declination −35° 07′ 59.2320″[1]
Apparent magnitude (V) +5.236±0.005[2]
Characteristics
Evolutionary stage main sequence
Spectral type F5V[3]
B−V color index 0.459±0.002[4]
Astrometry
Radial velocity (Rv)−21.1±0.3[4] km/s
Proper motion (μ) RA: +171.529[1] mas/yr
Dec.: +126.670[1] mas/yr
Parallax (π)46.1936 ± 0.1565[1] mas
Distance70.6 ± 0.2 ly
(21.65 ± 0.07 pc)
Absolute magnitude (MV)3.52[2]
Details[2]
Mass1.25 M☉
Radius1.40±0.05 R☉
Luminosity3.09[4] L☉
Surface gravity (log g)4.25±0.10 cgs
Temperature6,395±80 K
Metallicity [Fe/H]−0.07±0.07 dex
Rotational velocity (v sin i)1.0±1.0 km/s
Age1.6+2.4
−0.5[4] Gyr
Other designations
θ Scl, CD−35°4, FK5 6, GC 202, GJ 3013, HD 739, HIP 950, HR 35, SAO 192388, LTT 79, GSC 06995-01262[5]
Database references
SIMBADdata

According to Fuhrmann and Chini (2015) this is an astrometric binary system,[6] although Eggleton and Tokovinin (2008) deemed it to be a single star.[7] The visible component is an ordinary F-type main-sequence star with a stellar classification of F5V.[3] It is around 1.6[4] billion years old with 1.25 times the mass of the Sun and 1.40 times the Sun's radius. The star is radiating three[4] times the luminosity of the Sun from its photosphere at an effective temperature of 6,395 K.[2]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Fuhrmann, K.; Chini, R. (2012), "Multiplicity among F-type Stars", The Astrophysical Journal Supplement, 203 (2): 20, Bibcode:2012ApJS..203...30F, doi:10.1088/0067-0049/203/2/30, 30.
  3. Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006), "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample", The Astronomical Journal, 132: 161, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637.
  4. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  5. "tet Scl". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-03.
  6. Fuhrmann, K.; Chini, R. (August 2015), "Multiplicity among F-type stars. II", The Astrophysical Journal, 809 (1): 19, Bibcode:2015ApJ...809..107F, doi:10.1088/0004-637X/809/1/107, 107.
  7. 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:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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