Kappa1 Sculptoris

Kappa1 Sculptoris is a binary star[2] system in the southern constellation of Sculptor. It is faintly visible to the naked eye, with a combined apparent visual magnitude of +5.51.[2] Based upon an annual parallax shift of 12.91 mas as measured from Earth,[1] it is located roughly 250 light years from the Sun.

For other star systems with this Bayer designation, see κ Sculptoris.
Kappa1 Sculptoris
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sculptor
Right ascension 00h 09m 21.06696s[1]
Declination −27° 59′ 16.5322″[1]
Apparent magnitude (V) +5.51 (6.23 + 6.29)[2]
Characteristics
Spectral type F2V[3] (F4 III + F3 III)[2]
U−B color index +0.06[4]
B−V color index +0.42[4]
Astrometry
Radial velocity (Rv)7.7±1.6[5] km/s
Proper motion (μ) RA: +70.11[1] mas/yr
Dec.: −8.97[1] mas/yr
Parallax (π)12.91 ± 0.72 mas[1]
Distance250 ± 10 ly
(77 ± 4 pc)
Absolute magnitude (MV)2.05[6]
Orbit[7]
Period (P)616.04 yr
Semi-major axis (a)1.500″
Eccentricity (e)0.103
Inclination (i)98.98°
Longitude of the node (Ω)81.75°
Periastron epoch (T)2095.68
Argument of periastron (ω)
(secondary)		256.86°
Details
κ1 Scl A
Mass1.53[8] M☉
Luminosity31.3[9] L☉
Surface gravity (log g)3.94[8] cgs
Temperature6,697±228[8] K
Metallicity [Fe/H]+0.05[10] dex
Rotational velocity (v sin i)116.8±5.8[6] km/s
Age2.0[8] Gyr
Other designations
κ1 Scl, CD−28° 16, HD 493, HIP 761, HR 24, SAO 166083, ADS 111, WDS J00094-2759AB[11]
Database references
SIMBADdata

The pair orbit each other with an estimated period of 616 years, a semimajor axis of 1.5 arc seconds, and an eccentricity of 0.1.[7] Both components are evolved, yellow-white hued, F-type giant stars. The primary, component A, has a visual magnitude of 6.23[2] and a stellar classification of F4 III.[2] The companion, component B, is magnitude 6.29[2] and of class F3 III.[2] Their composite spectrum is classified as F2V.[3] The mass ratio is 0.782, meaning the secondary is only 78.2% as massive as the primary.[12] An 18th magnitude companion star lies 73.4 arc seconds distant along a position angle of 243°, as of 1998.[13]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. 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, S2CID 14878976.
  3. Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
  4. Hurly, P. R. (1975), "Combined-light UBV Photometry of 103 Bright Southern Visual Doubles", Monthly Notes of the Astronomical Society of Southern Africa, 34: 7, Bibcode:1975MNSSA..34....7H.
  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:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
  6. Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
  7. Hartkopf, W. I.; et al., Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory, archived from the original on 2011-05-17, retrieved 2017-06-02
  8. 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:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  9. 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:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  10. Casagrande, L.; et al. (2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy & Astrophysics, 530 (A138): 21, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, S2CID 56118016.
  11. "kap01 Scl -- Double or multiple star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-06-01.
  12. Makarov, Valeri V.; Fabricius, Claus (2021). "Astrometric Mass Ratios of 248 Long-period Binary Stars Resolved in Hipparcos and Gaia EDR3". The Astronomical Journal. 162 (6): 260. arXiv:2109.11951. Bibcode:2021AJ....162..260M. doi:10.3847/1538-3881/ac2ee0. S2CID 237635330.
  13. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22
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