6 Lacertae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 30m 29.26005s |
| Declination | +43° 07′ 24.1565″ |
| Apparent magnitude (V) | 4.52 |
| Characteristics | |
| Spectral type | B2 IV |
| B−V color index | −0.086±0.018 |
| Astrometry | |
| Radial velocity (Rv) | −8.7±0.9 km/s |
| Proper motion (μ) | RA: −4.800 mas/yr Dec.: −2.598 mas/yr |
| Parallax (π) | 1.7577±0.2697 mas |
| Distance | approx. 1,900 ly (approx. 570 pc) |
| Absolute magnitude (MV) | −2.62 |
| Orbit | |
| Period (P) | 880 days |
| Eccentricity (e) | 0.30 |
| Periastron epoch (T) | 2,416,300 JD |
| Argument of periastron (ω) (secondary) | 190° |
| Semi-amplitude (K1) (primary) | 9 km/s |
| Details | |
| Mass | 12.5±0.6 M☉ |
| Radius | 6.9 R☉ |
| Luminosity (bolometric) | 34,590 L☉ |
| Surface gravity (log g) | 3.56 cgs |
| Temperature | 21,150 K |
| Metallicity [Fe/H] | −0.04 dex |
| Rotational velocity (v sin i) | 70 km/s |
| Age | 15.7±0.1 Myr |
| Other designations | |
| 6 Lac, BD+42°4420, FK5 3800, HD 213420, HIP 111104, HR 8579, SAO 52079 | |
| Database references | |
| SIMBAD | data |
6 Lacertae is a binary star system in the northern constellation of Lacerta, located around 1,900 light years from the Sun. It is visible to the naked eye as a dim, blue-white hued star with a combined apparent visual magnitude of 4.52. The system is moving closer to the Earth with a heliocentric radial velocity of −9 km/s, and is a suspected member of the Lac OB1 association.
This system forms a single-lined spectroscopic binary with an orbital period of 880 days and an eccentricity of 0.3. The visible component has a stellar classification of B2 IV, matching a B-type subgiant star. It is about 16 million years old with a relatively high projected rotational velocity of 70 km/s. The star has 12.5 times the mass of the Sun and about 7 times the Sun's radius. It is radiating a net 34,590 times the Sun's luminosity from its photosphere at an effective temperature of 21,150 K.