Delta Trianguli
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 17m 03.2s |
| Declination | +34° 13′ 27″ |
| Apparent magnitude (V) | +4.84 |
| Characteristics | |
| Spectral type | G0.5V / K4V |
| B-V color index | 0.61 |
| U-B color index | 0.02 |
| Variable type | ? |
| Astrometry | |
| Radial velocity (Rv) | -6.6 km/s |
| Proper motion (μ) | RA: 1,154 mas/yr Dec.: -245 mas/yr |
| Parallax (π) | 92.41 ± 0.82 mas |
| Distance | 35.3 ± 0.3 ly (10.82 ± 0.1 pc) |
| Absolute magnitude (MV) | 4.67 |
| Details | |
| Mass | 1.09 / ? M☉ |
| Radius | 0.98 / ? R☉ |
| Luminosity | 1.1 / ? L☉ |
| Temperature | 6000 / ? K |
| Metallicity | 13-30% |
| Rotation | <10 km/s. |
| Age | ? years |
| Visual binary orbit | |
| Companion | Delta Trianguli B |
| Period (P) | 0.02743 years |
| Semimajor axis (a) | 0.00980 ± 0.0006" |
| Eccentricity (e) | 0.020 ± 0.005 |
| Inclination (i) | 167 ± 3° |
| Node (Ω) | 15 ± 9° |
| Periastron epoch (T) | 2,448,117.5 ± 0.2 JD |
| Other designations | |
Delta Trianguli (δ Tri / δ Trianguli) is a spectroscopic binary approximately 35 light-years away in the constellation Triangulum.
Delta Trianguli A is a yellow dwarf star and with a mass higher than the Sun. Delta Trianguli B (as put by the nature of the secondary star) is not well determined. As the close orbit makes observations difficult, though it may be an orange dwarf of spectral type K4V. This system is part of the Zeta Herculis stellar moving group.
The Delta Trianguli stars orbit their center of mass. Star A orbits approximately 0.045 AU from the center and star B orbits approximately 0.065 AU from the center. They orbit each other every 10.02 days in a circular orbit with a low eccentricity of only 0.012-0.020. The orbit is inclined 157-167° to our line of sight.
The closest known star to Delta Trianguli is LP 245-10 which is a red dwarf approximately 1.8 light-years away from Delta Trianguli. The closest star known to have extrasolar planets is Upsilon Andromedae approximately 11 light-years away from Delta Trianguli.
