Global InformationZeta1 Lyrae information
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 44m 46.35735s[1] |
| Declination | +37° 36′ 18.4171″[1] |
| Apparent magnitude (V) | 4.37[2] |
| Characteristics | |
| Spectral type | kA5hF0mF2[3] |
| U−B color index | +0.17[2] |
| B−V color index | +0.18[2] |
| Astrometry | |
| Proper motion (μ) | RA: +29.04[1] mas/yr Dec.: +27.03[1] mas/yr |
| Parallax (π) | 20.89 ± 0.17 mas[1] |
| Distance | 156 ± 1 ly (47.9 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.94[4] |
| Orbit[5] | |
| 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[6] M☉ |
| Radius | 2.5[7] R☉ |
| Luminosity | 31[8] L☉ |
| Surface gravity (log g) | 3.7±0.1[9] cgs |
| Temperature | 7914±112[9] K |
| Metallicity [Fe/H] | 0.38±0.06[9] dex |
| Rotational velocity (v sin i) | 47[10] km/s |
| Age | 500[6] Myr |
| Other designations | |
ζ1 Lyr, 6 Lyr, BD+37°3222, HD 173648, HIP 91971, HR 7056, SAO 67321.[11] | |
| 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,[1] 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.[2]
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