Iota Trianguli
Iota Trianguli, Latinized from ι Trianguli, is a quadruple star system in constellation of Triangulum. The pair have a combined apparent magnitude of 4.95 and are approximately 290 light years from Earth.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Triangulum |
| A | |
| Right ascension | 02h 12m 22.2797s |
| Declination | +30° 18′ 11.053″ |
| Apparent magnitude (V) | 5.32 |
| B | |
| Right ascension | 02h 12m 22.5637s |
| Declination | +30° 18′ 12.342″ |
| Apparent magnitude (V) | 6.83 |
| Characteristics | |
| A | |
| Spectral type | G0 III + G5 III |
| B−V color index | +0.856 |
| Variable type | ellipsoidal + RS CVn |
| B | |
| Spectral type | F5V + ? |
| B−V color index | +0.515 |
| Astrometry | |
| A | |
| Proper motion (μ) | RA: −64.350 mas/yr Dec.: −59.503 mas/yr |
| Parallax (π) | 11.3011 ± 0.1024 mas |
| Distance | 289 ± 3 ly (88.5 ± 0.8 pc) |
| B | |
| Proper motion (μ) | RA: −64.414 mas/yr Dec.: −49.913 mas/yr |
| Parallax (π) | 12.7375 ± 0.5496 mas |
| Distance | 260 ± 10 ly (79 ± 3 pc) |
| Absolute magnitude (MV) | +0.20 |
| Orbit | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 14.73018 days |
| Semi-major axis (a) | 0.002″ |
| Eccentricity (e) | 0.0035 |
| Inclination (i) | 55 – 58° |
| Semi-amplitude (K1) (primary) | 54.84 km/s |
| Semi-amplitude (K2) (secondary) | 56.39 km/s |
| Orbit | |
| Primary | Ba |
| Companion | Bb |
| Period (P) | 2.2365 days |
| Eccentricity (e) | 0 |
| Semi-amplitude (K1) (primary) | 95.4 km/s |
| Semi-amplitude (K2) (secondary) | 101.0 km/s |
| Details | |
| Aa | |
| Mass | 2.50 M☉ |
| Radius | 4.0 R☉ |
| Luminosity | 61.7 L☉ |
| Temperature | 4,932 K |
| Rotational velocity (v sin i) | 32.9 km/s |
| Ab | |
| Mass | 2.43 M☉ |
| Radius | 1.5 R☉ |
| Luminosity | 10.0 L☉ |
| Temperature | 6,486 K |
| Rotational velocity (v sin i) | 3.0 km/s |
| Ba | |
| Mass | 1.58 M☉ |
| Bb | |
| Mass | 1.56 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Both components of ι Trianguli are spectroscopic binaries and the brighter pair is variable. It has been given the variable star designation TZ Trianguli. The variations are due to the ellipsoidal shape of the stars as they rotate, and also it is classified as an RS Canum Venaticorum variable.
Together with 10 Trianguli and 12 Trianguli, it forms part of the obsolete Triangulum Minus.
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