Delta Trianguli
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Triangulum |
| Right ascension | 02h 17m 03.2s |
| Declination | +34° 13′ 27″ |
| Apparent magnitude (V) | +4.84 |
| Characteristics | |
| Spectral type | G0.5V / K4V |
| U-B color index | 0.02 |
| B-V color index | 0.61 |
| 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 yr |
| Semimajor axis (a) | 0.00980 ± 0.0006" |
| Eccentricity (e) | 0.020 ± 0.005 |
| Inclination (i) | 167 ± 3° |
| Longitude of the 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 star system 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. The spectral characteristics of the smaller companion Delta Trianguli B are not well determined since the close orbit makes observations difficult, although 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 nearly circular orbit; the eccentricity of the orbit is 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.
