Zeta1 Lyrae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 44m 46.35735s |
| Declination | +37° 36′ 18.4171″ |
| Apparent magnitude (V) | 4.37 |
| Characteristics | |
| Spectral type | kA5hF0mF2 |
| U−B color index | +0.17 |
| B−V color index | +0.18 |
| Astrometry | |
| Proper motion (μ) | RA: +29.04 mas/yr Dec.: +27.03 mas/yr |
| Parallax (π) | 20.89±0.17 mas |
| Distance | 156 ± 1 ly (47.9 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.94 |
| Orbit | |
| Period (P) | 4.3 d |
| Eccentricity (e) | 0.01 |
| Periastron epoch (T) | 2440000.723 JD |
| Argument of periastron (ω) (secondary) | 0.00° |
| Semi-amplitude (K1) (primary) | 51.6 km/s |
| Details | |
| Mass | 2.36 M☉ |
| Radius | 2.5 R☉ |
| Luminosity | 31 L☉ |
| Surface gravity (log g) | 3.7±0.1 cgs |
| Temperature | 7914±112 K |
| Metallicity [Fe/H] | 0.38±0.06 dex |
| Rotational velocity (v sin i) | 47 km/s |
| Age | 500 Myr |
| Other designations | |
| ζ1 Lyr, 6 Lyr, BD+37°3222, HD 173648, HIP 91971, HR 7056, SAO 67321. | |
| Database references | |
| SIMBAD | data |
Zeta1 Lyrae, Latinized from ζ1 Lyrae, is a binary star in the northern constellation of Lyra. Based upon an annual parallax shift of 20.89 mas as seen from Earth, the pair are located about 156 light years from the Sun. It is visible to the naked eye with an apparent visual magnitude of 4.37.