Kappa Trianguli Australis
Variable star in the constellation Triangulum Australe
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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.
  | |
| 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]