Iota1 Librae
Iota1 Librae, Latinized from ι1 Librae, is a quadruple star system in the constellation Libra. Its apparent magnitude is 4.54. It is located 379 light years from earth.
Map of the constellation of Libra. | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Libra |
| Right ascension | 15h 12m 13.29025s |
| Declination | −19° 47′ 30.1592″ |
| Apparent magnitude (V) | +4.54 |
| Characteristics | |
| Evolutionary stage | Blue subgiant |
| Spectral type | B9IVpSi + B9 |
| U−B color index | −0.38 |
| B−V color index | −0.08 |
| Variable type | Alpha2 Canum Venaticorum |
| Astrometry | |
| Radial velocity (Rv) | −11.6 km/s |
| Proper motion (μ) | RA: −35.40 mas/yr Dec.: −32.79 mas/yr |
| Parallax (π) | 8.59 ± 0.25 mas |
| Distance | 380 ± 10 ly (116 ± 3 pc) |
| Absolute magnitude (MV) | −0.79 |
| Orbit | |
| Period (P) | 8163.16 d |
| Eccentricity (e) | 0.35 |
| Periastron epoch (T) | 2433155 JD |
| Argument of periastron (ω) (secondary) | 7.6° |
| Semi-amplitude (K1) (primary) | 3.4 km/s |
| Details | |
| Luminosity | 277 L☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
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