5 Lacertae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 29m 31.823s |
| Declination | +47° 42′ 24.79″ |
| Apparent magnitude (V) | 4.36 |
| Characteristics | |
| Spectral type | K6–M0I + B7/8V |
| U−B color index | +1.11 |
| B−V color index | +1.68 |
| Variable type | LC |
| Astrometry | |
| Radial velocity (Rv) | −3.4±0.2 km/s |
| Proper motion (μ) | RA: −2.554 mas/yr Dec.: −5.372 mas/yr |
| Parallax (π) | 1.4838±0.1383 mas |
| Distance | 2,170+200 −180 ly (665+62 −54 pc) |
| Absolute magnitude (MV) | −4.16 |
| Orbit | |
| Period (P) | 41.95±0.20 yr |
| Eccentricity (e) | 0.49±0.01 |
| Periastron epoch (T) | 2427578.3±260 JD |
| Argument of periastron (ω) (secondary) | 323±5.0° |
| Semi-amplitude (K1) (primary) | 12.2±1.2 km/s |
| Semi-amplitude (K2) (secondary) | 112.0±8.2 km/s |
| Details | |
| 5 Lacertae A | |
| Mass | 5.11±0.18 M☉ |
| Radius | 427+36 −44 R☉ |
| Luminosity | 25,100 L☉ |
| Temperature | 3,790 K |
| Rotational velocity (v sin i) | 50 km/s |
| Age | 110±10 Myr |
| 5 Lacertae B | |
| Rotational velocity (v sin i) | 89 km/s |
| Other designations | |
| V412 Lac, BD+46°3719, FK5 3799, HD 213310/1, HIP 111022, HR 8572, SAO 52055 | |
| Database references | |
| SIMBAD | data |
5 Lacertae (5 Lac) is a spectroscopic binary in the constellation Lacerta. Its apparent magnitude is 4.36.