Zeta Trianguli Australis
From Infogalactic: the planetary knowledge core
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Triangulum Australe |
| Right ascension | 16h 28m 28.14362s[1] |
| Declination | −70° 05′ 03.8419″[1] |
| Apparent magnitude (V) | 4.90[2] |
| Characteristics | |
| Spectral type | F9 V[3] |
| U−B color index | +0.02[2] |
| B−V color index | +0.55[4] |
| Astrometry | |
| Radial velocity (Rv) | +8.3[5] km/s |
| Proper motion (μ) | RA: 199.97[1] mas/yr Dec.: 110.97[1] mas/yr |
| Parallax (π) | 82.53 ± 0.52[1] mas |
| Distance | 39.5 ± 0.2 ly (12.12 ± 0.08 pc) |
| Details | |
| ζ TrA A | |
| Mass | 1.12[6] M☉ |
| Metallicity [Fe/H] | –0.18[4] dex |
| Rotation | 13 days[4] |
| Rotational velocity (v sin i) | 3.23[7] km/s |
| Age | 600–900[8] Myr |
| ζ TrA B | |
| Mass | 0.40[6] M☉ |
| Orbit[9] | |
| 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 |
| 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 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.[9]
Somewhat surprisingly for a star located at 70° S, it is a candidate swarm member of the Ursa Major moving group.[10] However, there is some evidence to the contrary.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found. Note: see VizieR catalogue I/311.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 4.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 9.0 9.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
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