Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lacerta |
Right ascension | 22h 23m 33.624s[1] |
Declination | +52° 13′ 44.56″[1] |
Apparent magnitude (V) | 4.43[2] |
Characteristics | |
Spectral type | G8 III[3] |
U−B color index | +0.77[4] |
B−V color index | +1.02[4] |
V−R color index | 0.6[2] |
R−I color index | +0.57[4] |
Astrometry | |
Radial velocity (Rv) | −10.4 ± 0.9[2] km/s |
Proper motion (μ) | RA: −13.25±0.13[1] mas/yr Dec.: −186.77±0.13[1] mas/yr |
Parallax (π) | 19.19 ± 0.16 mas[1] |
Distance | 170 ± 1 ly (52.1 ± 0.4 pc) |
Absolute magnitude (MV) | +0.67[5] |
Details[5] | |
Mass | 0.97±0.21[3] M☉ |
Radius | 10.96±0.23[3] R☉ |
Luminosity | 57.7±3.0[3] L☉ |
Surface gravity (log g) | 2.43 cgs |
Temperature | 4803±75[3] K |
Metallicity [Fe/H] | −0.33 dex |
Rotational velocity (v sin i) | < 17[4] km/s |
Age | 6.76±3.59[3] Gyr |
Other designations | |
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,[1] 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.[5]
This is an evolved G-type giant with an apparent visual magnitude of approximately 4.43.[2] It is a red clump[6] star and the primary component of a suspected binary system, with the pair having an angular separation of 0.2 arcsecond.[7]
In Chinese, 螣蛇 (Téng Shé), meaning Flying Serpent, refers to an asterism consisting of β Lacertae, α Lacertae, 4 Lacertae, π2 Cygni, π1 Cygni, HD 206267, ε Cephei, σ Cassiopeiae, ρ Cassiopeiae, τ Cassiopeiae, AR Cassiopeiae, 9 Lacertae, 3 Andromedae, 7 Andromedae, 8 Andromedae, λ Andromedae, κ Andromedae, ι Andromedae and ψ Andromedae. Consequently, the Chinese name for β Lacertae itself is 螣蛇十 (Téng Shé shí, English: the Tenth Star of Flying Serpent).[8]