Kappa Trianguli Australis

Kappa Trianguli Australis (κ Trianguli Australis) is a star in the constellation Triangulum Australe. It is a yellow G-type supergiant with an apparent magnitude of +5.08, making it visible to the naked eye under good observing conditions. It is around 1,200 light years from Earth.

A light curve for Kappa Trianguli Australis, plotted from Hipparcos data^[12]

κ Trianguli Australis

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]
Characteristics
Spectral type	G3/5 Ib[3]
B−V color index	+1.12[2]
Variable type	suspected SRD[4]
Astrometry
Radial velocity (Rv)	+3.9±0.3[5] km/s
Proper motion (μ)	RA: −9.36[1] mas/yr Dec.: −6.79[1] mas/yr
Parallax (π)	2.70±0.26 mas[1]
Distance	1,200 ± 100 ly (370 ± 40 pc)
Absolute magnitude (MV)	−2.71[6]
Details
Mass	7.0[7] M☉
Luminosity	1,761[8] L☉
Surface gravity (log g)	1.90[9] cgs
Temperature	4,658[10] K
Metallicity [Fe/H]	+0.21[9] dex
Rotational velocity (v sin i)	7.7±1.0[10] km/s
Age	55.2[7] Myr
Other designations
κ TrA, CPD−68°2585, FK5 3253, HD 141767, HIP 77982, HR 5891, SAO 253342[11]
Database references
SIMBAD	data

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.^[13]