Alpha Trianguli
Alpha Trianguli (α Trianguli, abbreviated Alpha Tri, α Tri) is a spectroscopic binary star in the constellation of Triangulum. Based on parallax measurements obtained during the Hipparcos mission, it is approximately 63.3 light-years (19.4 parsecs) distant from the Sun. The brighter or primary component is named Mothallah /məˈθælə/.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 01h 53m 04.90710s |
| Declination | +29° 34′ 43.7801″ |
| Apparent magnitude (V) | +3.42 |
| Characteristics | |
| Spectral type | F5III to F6IV + M |
| U−B color index | +0.06 |
| B−V color index | +0.48 |
| Variable type | Ellipsoidal |
| Astrometry | |
| Radial velocity (Rv) | −12.6 km/s |
| Proper motion (μ) | RA: 10.82 mas/yr Dec.: −234.24 mas/yr |
| Parallax (π) | 51.50 ± 0.23 mas |
| Distance | 63.3 ± 0.3 ly (19.42 ± 0.09 pc) |
| Absolute magnitude (MV) | 1.98 |
| Orbit | |
| Period (P) | 1.767 days |
| Eccentricity (e) | 0.065 |
| Semi-amplitude (K1) (primary) | 10.64 km/s |
| Details | |
| α Tri A | |
| Mass | 1.70 M☉ |
| Radius | 3.22 R☉ |
| Surface gravity (log g) | 3.91 cgs |
| Temperature | 6,288 K |
| Metallicity [Fe/H] | −0.09 to 0.00 dex |
| Rotational velocity (v sin i) | 81.6 km/s |
| Age | 1.6 Gyr |
| α Tri B | |
| Mass | 0.11 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
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