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]
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]