Delta Trianguli
Delta Trianguli, Latinized from Delta Tri, is a spectroscopic binary star system approximately 35 light-years (11 pc) away in the constellation of Triangulum. The primary star is a yellow dwarf, while the secondary star is thought to be an orange dwarf. It has an apparent magnitude of +4.87 and forms an optical (line-of-sight) triple with Gamma Trianguli and 7 Trianguli.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 17m 03.23016s |
| Declination | +34° 13′ 27.2260″ |
| Apparent magnitude (V) | +4.865 |
| Characteristics | |
| Spectral type | G0V + G9V to K4V |
| U−B color index | +0.02 |
| B−V color index | +0.61 |
| Astrometry | |
| Radial velocity (Rv) | −5.70 km/s |
| Proper motion (μ) | RA: 1151.83 mas/yr Dec.: −246.89 mas/yr |
| Parallax (π) | 92.73 ± 0.39 mas |
| Distance | 35.2 ± 0.1 ly (10.78 ± 0.05 pc) |
| Absolute magnitude (MV) | 4.69 |
| Orbit | |
| Companion | Delta Trianguli B |
| Period (P) | 10.02 days |
| Semi-major axis (a) | 9.80±0.06 mas |
| Eccentricity (e) | 0.020±0.005 |
| Inclination (i) | 167±3° |
| Longitude of the node (Ω) | 15±9° |
| Details | |
| A | |
| Mass | 1.0 M☉ |
| Radius | 0.98 R☉ |
| Surface gravity (log g) | 4.5 cgs |
| Temperature | 6,215 K |
| Metallicity [Fe/H] | −0.39 to −0.30 dex |
| Rotational velocity (v sin i) | 10.00 km/s |
| Age | 8.5 to 9.0 Gyr |
| B | |
| Mass | 0.8 M☉ |
| Temperature | 4,493 K |
| Other designations | |
δ Tri, Delta Tri, 8 Trianguli, BD+33° 395, HD 13974, HIP 10644, HR 660, SAO 55420, LHS 154, LTT 10770 | |
| Database references | |
| SIMBAD | data |
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