Zeta Trianguli Australis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Triangulum Australe |
| Right ascension | 16h 28m 28.14362s |
| Declination | −70° 05′ 03.8419″ |
| Apparent magnitude (V) | 4.90 |
| Characteristics | |
| Spectral type | F9 V |
| U−B color index | +0.02 |
| B−V color index | +0.55 |
| Astrometry | |
| Radial velocity (Rv) | +8.3 km/s |
| Proper motion (μ) |
RA: 199.97 mas/yr Dec.: 110.97 mas/yr |
| Parallax (π) | 82.53 ± 0.52mas |
| Distance | 39.5 ± 0.2 ly (12.12 ± 0.08 pc) |
| Absolute magnitude (MV) | 4.49 |
| Orbit | |
| Period (P) | 12.97662 ± 0.00017 d |
| Eccentricity (e) | 0.01442 ± 0.00021 |
| Periastron epoch (T) | JD 2452752.31955 |
|
Argument of periastron (ω) (secondary) |
252.98° ± 0.80° |
|
Semi-amplitude (K1) (primary) |
7.4988 ± 0.0016 km/s |
| Details | |
| ζ TrA A | |
| Mass | 1.12 M☉ |
| Metallicity [Fe/H] | –0.18 dex |
| Rotation | 13 days |
| Rotational velocity (v sin i) | 3.23 km/s |
| Age | 600–900 Myr |
| ζ TrA B | |
| Mass | 0.40 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Zeta Trianguli Australis (ζ TrA) is a spectroscopic binary in the constellation Triangulum Australe. It is approximately 39.5 light years from Earth.
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 a low 0.014, making it nearly circular.
Somewhat surprisingly for a star located at 70° S, it is a candidate swarm member of the Ursa Major moving group. However, there is some evidence to the contrary.
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