Zeta Trianguli Australis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Triangulum Australe |
| Right ascension | 16h 28m 28.1s |
| Declination | -70° 05′ 04″ |
| Apparent magnitude (V) | 4.90 |
| Characteristics | |
| Spectral type | F9 V (F6V + G1V) |
| U−B color index | 0.03 |
| B−V color index | 0.54 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | +7.6 km/s |
| Proper motion (μ) | RA: 199.88 mas/yr Dec.: 110.77 mas/yr |
| Parallax (π) | 82.61 ± 0.57 mas |
| Distance | 39.5 ± 0.3 ly (12.11 ± 0.08 pc) |
| Absolute magnitude (MV) | 4.49 |
| Other designations | |
Zeta Trianguli Australis (ζ TrA) is a spectroscopic binary in the constellation Triangulum Australe. It is approximately 39.5 light years from Earth.
The system is composed of two main sequence stars, one a yellow-white F-type dwarf and the other a yellow G-type dwarf. The binary's composite spectral class is F9V and its combined apparent magnitude is +4.90. The pair orbit each other once every 13 days, and the orbital eccentricity is 0.014.
Somewhat surprisingly for a star located at 70° S, it is a swarm member of the Ursa Major moving group.
References
- Jovan Skuljan, 2004, "Accurate orbital parameters for the bright southern spectroscopic binary ζ Trianguli Australis – an interesting case of a near-circular orbit", Monthly Notices of the Royal Astronomical Society, Volume 352, p. 975.
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