Astronomy:Kappa Tucanae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Tucana |
| Right ascension | 01h 15m 46.16226s[1] |
| Declination | −68° 52′ 33.3356″[1] |
| Apparent magnitude (V) | +4.25[2] or +4.86[3] (5.00 + 7.74 + 7.84 + 8.44)[4] |
| Characteristics | |
| Spectral type | F6 IV + G5 V + K2V + ?[5] |
| B−V color index | 0.48[6] |
| Astrometry | |
| Radial velocity (Rv) | +7.7±1.7[2] km/s |
| Proper motion (μ) | RA: +412.11[1] mas/yr Dec.: +127.74[1] mas/yr |
| Parallax (π) | 47.72 ± 0.41[1] mas |
| Distance | 68.3 ± 0.6 ly (21.0 ± 0.2 pc) |
| Absolute magnitude (MV) | 3.50[6] |
| Orbit[7] | |
| Period (P) | 857.0 yr |
| Semi-major axis (a) | 5.960″ |
| Eccentricity (e) | 0.384 |
| Inclination (i) | 127.1° |
| Longitude of the node (Ω) | 10.3° |
| Periastron epoch (T) | 1763.50 |
| Argument of periastron (ω) (secondary) | 284.9° |
| Details | |
| κ Tuc A | |
| Mass | 1.37[8] M☉ |
| Temperature | 6,366[6] K |
| Rotational velocity (v sin i) | 61.1±3.1[6] km/s |
| κ Tuc B | |
| Mass | 0.85[8] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kappa Tucanae, Latinised from, κ Tucanae, is a quadruple[5] star system in the southern constellation Tucana. It is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of either +4.25[2] or +4.86,[3] depending on the source. The system is located approximately 68 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +8 km/s.[2]
The system consists of two binary pairs separated by 5.3 arcminutes. The brightest star, Kappa Tucanae A, is a yellow-white F-type subgiant with an apparent magnitude of +5.0. Its binary companion, Kappa Tucanae B, has a magnitude of 7.74 and is located about 6″ away from the primary. It completes an orbit around the primary every 857 years.[7]
The other binary pair, the magnitude +7.8 C, and the magnitude +8.4 D, are closer to one another, at 1.12 arcseconds, or at least 23 astronomical units. They orbit each other once every 86.2 years.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Hoffleit, D.; Warren, Jr., W. H. (1991), The Bright Star Catalogue (5th Revised ed.), http://vizier.u-strasbg.fr/cgi-bin/VizieR?-source=V/50, retrieved 2019-09-16.
- ↑ Mason, B. D. et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal 122 (6): 3466, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.
- ↑ 5.0 5.1 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 6.0 6.1 6.2 6.3 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, doi:10.1051/0004-6361/201118724, Bibcode: 2012A&A...542A.116A.
- ↑ 7.0 7.1 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6.
- ↑ 8.0 8.1 Tokovinin, A.; Kiyaeva, O. (2015). "Eccentricity distribution of wide binaries". Monthly Notices of the Royal Astronomical Society 456 (2): 2070. doi:10.1093/mnras/stv2825. Bibcode: 2016MNRAS.456.2070T.
- ↑ "kap Tuc -- Double or multiple star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=kap+Tuc, retrieved 2017-04-21.
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