Delta Trianguli
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 02h 17m 03.2s |
| Declination | +34° 13′ 27″ |
| Apparent magnitude (V) | +4.84 |
| Characteristics | |
| Spectral type | G0.5Ve / K4V |
| U−B color index | 0.02 |
| B−V color index | 0.61 |
| 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 ± 0.10 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. |
| Orbit | |
| Companion | Delta Trianguli B |
| Period (P) | 0.02743 yr |
| Semi-major axis (a) | 0.11 AU 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 | |
8 Trianguli, ADS 1739, BD+33°395, CCDM J02170+3414, GC 2733, GCTP 464.00, Gliese 92, HD 13974, HIP 10644
HR 660, LFT 198, LHS 154, LTT 10770, SAO 55420 | |
| Database references | |
| SIMBAD | data |
Delta Trianguli (δ Tri / δ Trianguli) is a spectroscopic binary star system approximately 35 light-years away in the constellation of Triangulum. The primary star is a yellow dwarf, while the secondary star is thought to be an orange dwarf. The system is one part of a moving group of stars with Zeta Herculis.
Stellar components
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.
Distance and visibility
The closest star to the Delta Trianguli system is red dwarf Gliese 3147 (LP 245-10), approximately 1.8 light-years away from the system. The closest confirmed planetary system is the Upsilon Andromedae system, approximately 11 light-years away from the system. The brightest star seen from the system would be Capella, which would look like a yellow star with an apparent magnitude of -1. The Sun would appear to be a faint star located near Beta Centauri and Sirius.
See also
External links
- "Delta Trianguli 2". SolStation. Retrieved 2008-06-22.
- "Sixth Catalog of Orbits of Visual Binary Stars". U.S. Naval Observatory. Retrieved 2008-06-22.