Kappa Trianguli Australis

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κ Trianguli Australis
Triangulum Australe constellation map.svg
Red circle.svg

Location of κ Trianguli Australis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Triangulum Australe
Right ascension 15h 55m 29.59831s[1]
Declination −68° 36′ 10.8101″[1]
Apparent magnitude (V) +5.08[2]
Spectral type G3/5 Ib[3]
B−V color index +1.12[2]
Radial velocity (Rv) +3.9±0.3[4] km/s
Proper motion (μ) RA: −9.36[1] mas/yr
Dec.: −6.79[1] mas/yr
Parallax (π) 2.70 ± 0.26[1] mas
Distance 1,200 ± 100 ly
(370 ± 40 pc)
Absolute magnitude (MV) −2.71[5]
Mass 7.0[6] M
Luminosity 1,761[7] L
Surface gravity (log g) 1.90[8] cgs
Temperature 4,658[9] K
Metallicity [Fe/H] +0.21[8] dex
Rotational velocity (v sin i) 7.7±1.0[9] km/s
Age 55.2[6] Myr
Other designations
κ TrA, CPD−68° 2585, FK5 3253, HD 141767, HIP 77982, HR 5891, SAO 253342[10]
Database references

Kappa Trianguli Australis (κ Trianguli Australis) is a star in the constellation Triangulum Australe.

Kappa Trianguli Australis is a yellow G-type supergiant with an apparent magnitude of +5.08. It is around 1,200 light years from Earth.

It is not generally listed as a variable star but Hipparcos photometry showed small amplitude brightness changes. The dominant period was around 600 days and the amplitude less than a hundredth of a magnitude.[11]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357. 
  2. ^ a b Cousins, A. W. J. (1977), "UCBV Magnitudes and Colours of South Circumpolar Stars", South African Astronomical Observatory Circulars, 1: 51, Bibcode:1977SAAOC...1...51C. 
  3. ^ Houk, N.; Cowley, A. P. (1975), "University of Michigan Catalogue of two-dimensional spectral types for the HD stars", University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0, 1, Bibcode:1975MSS...C01....0H. 
  4. ^ 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, Bibcode:2012A&A...546A..61D, arXiv:1208.3048Freely accessible, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, Bibcode:2012AstL...38..331A, arXiv:1108.4971Freely accessible, doi:10.1134/S1063773712050015. 
  6. ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. Bibcode:2011MNRAS.410..190T. arXiv:1007.4883Freely accessible. doi:10.1111/j.1365-2966.2010.17434.x. 
  7. ^ McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, Bibcode:2012MNRAS.427..343M, arXiv:1208.2037Freely accessible, doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ a b Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. Bibcode:2016A&A...591A.118S. arXiv:1605.07384Freely accessible. doi:10.1051/0004-6361/201628497. 
  9. ^ a b Ammler-von Eiff, M.; Reiners, A. (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: 31, Bibcode:2012A&A...542A.116A, arXiv:1204.2459Freely accessible, doi:10.1051/0004-6361/201118724, A116. 
  10. ^ "kap TrA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-29. 
  11. ^ Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331: 45. Bibcode:2002MNRAS.331...45K. arXiv:astro-ph/0112194Freely accessible. doi:10.1046/j.1365-8711.2002.05150.x.