Beta Lacertae
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 23m 33.624s |
| Declination | +52° 13′ 44.56″ |
| Apparent magnitude (V) | 4.43 |
| Characteristics | |
| Evolutionary stage | red clump |
| Spectral type | G8 III |
| U−B color index | +0.77 |
| B−V color index | +1.02 |
| V−R color index | 0.6 |
| R−I color index | +0.57 |
| Astrometry | |
| Radial velocity (Rv) | −10.4 ± 0.9 km/s |
| Proper motion (μ) | RA: −13.25±0.13 mas/yr Dec.: −186.77±0.13 mas/yr |
| Parallax (π) | 19.19±0.16 mas |
| Distance | 170 ± 1 ly (52.1 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.67 |
| Details | |
| Mass | 0.97±0.21 M☉ |
| Radius | 10.96±0.23 R☉ |
| Luminosity | 57.7±3.0 L☉ |
| Surface gravity (log g) | 2.43 cgs |
| Temperature | 4803±75 K |
| Metallicity [Fe/H] | −0.33 dex |
| Rotational velocity (v sin i) | < 17 km/s |
| Age | 6.76±3.59 Gyr |
| Other designations | |
| β Lac, Beta Lacertae, Beta Lac, 3 Lacertae, 3 Lac, BD+51 3358, FK5 844, GC 31310, HD 212496, HIP 110538, HR 8538, NLTT 53741, PPM 40598, SAO 34395 | |
| Database references | |
| SIMBAD | data |
Beta Lacertae (Beta Lac, β Lacertae, β Lac) is the fourth-brightest star in the constellation of Lacerta. Based upon an annual parallax shift of 19.19 mas, it is 170 light-years distant from Earth. At that distance, the visual magnitude is diminished by an extinction factor of 0.17 due to interstellar dust.
This is an evolved G-type giant with an apparent visual magnitude of approximately 4.43. It is a red clump star and the primary component of a suspected binary system, with the pair having an angular separation of 0.2 arcsecond.