Beta Lacertae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 23m 33.6235s[1] |
| Declination | +52° 13′ 44.567″[1] |
| Apparent magnitude (V) | 4.43[1] |
| Characteristics | |
| Spectral type | G8.5IIIb[1] |
| U−B color index | +0.77[2] |
| B−V color index | +1.02[2] |
| V−R color index | 0.6[1] |
| R−I color index | +0.57[2] |
| Astrometry | |
| Radial velocity (Rv) | −10.4 ± 0.9[1] km/s |
| Proper motion (μ) | RA: −13.56[1] mas/yr Dec.: −186.37[1] mas/yr |
| Parallax (π) | 19.21 ± 0.51[1] mas |
| Distance | 170 ± 5 ly (52 ± 1 pc) |
| Absolute magnitude (MV) | 0.85[3] |
| Details | |
| Radius | 10.7 ± 0.3[4] R☉ |
| Rotational velocity (v sin i) | < 17[2] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Beta Lacertae (Beta Lac, β Lacertae, β Lac) is the fourth-brightest star in the constellation of Lacerta. It is a G-type giant with an apparent visual magnitude of approximately 4.43.[1]
Naming
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, β Lacertae itself is known as 螣蛇十 (Téng Shé shí, English: the Tenth Star of Flying Serpent)[5]
References
- 1 2 3 4 5 6 7 8 9 10 11 NLTT 53741 -- High proper-motion Star, database entry, SIMBAD. Accessed on line November 17, 2008.
- 1 2 3 4 HR 8538, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 17, 2008.
- ↑ From apparent magnitude and parallax.
- ↑ Nordgren, Tyler E.; et al. (December 1999), "Stellar Angular Diameters of Late-Type Giants and Supergiants Measured with the Navy Prototype Optical Interferometer", The Astronomical Journal, 118 (6): 3032–3038, Bibcode:1999AJ....118.3032N, doi:10.1086/301114
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日
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