Gamma Lyrae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 58m 56.62241s |
| Declination | +32° 41′ 22.4003″ |
| Apparent magnitude (V) | 3.24 |
| Characteristics | |
| Spectral type | B9 III |
| U−B color index | −0.125 |
| B−V color index | −0.04 |
| Astrometry | |
| Radial velocity (Rv) | −21.1 km/s |
| Proper motion (μ) | RA: −3.09 mas/yr Dec.: +1.11 mas/yr |
| Parallax (π) | 5.26±0.27 mas |
| Distance | 620 ± 30 ly (190 ± 10 pc) |
| Absolute magnitude (MV) | −3.14 |
| Details | |
| Mass | 5.76±0.13 M☉ |
| Radius | 13.28±1.15 R☉ |
| Luminosity | 2,430±190 L☉ |
| Surface gravity (log g) | 3.5±0.25 cgs |
| Temperature | 11000±100 K |
| Metallicity [Fe/H] | +0.15 dex |
| Rotational velocity (v sin i) | 65 km/s |
| Age | 74.8±5.1 Myr |
| Other designations | |
| Sulafat, Gamma Lyrae, γ Lyr, γ Lyrae, 14 Lyr, BD+32°3286, FK5 713, HD 176437, HIP 93194, HR 7178, SAO 67663 | |
| Database references | |
| SIMBAD | data |
Gamma Lyrae, Latinised from γ Lyrae, and formally named Sulafat /ˈsuːləfæt/, is the second-brightest star in the northern constellation of Lyra. With an apparent visual magnitude of 3.3, it is readily visible to the naked eye. Parallax measurements yield an estimated distance of 620 light-years (190 parsecs) from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.12±0.03 due to interstellar dust.