Beta Lacertae

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β 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]
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]
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]
Radius 10.7 ± 0.3[4] R
Rotational velocity (v sin i) < 17[2] km/s
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.[1]
Database references

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]


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]


  1. ^ a b c d e f g h i j k NLTT 53741 -- High proper-motion Star, database entry, SIMBAD. Accessed on line November 17, 2008.
  2. ^ a b c d 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.
  3. ^ From apparent magnitude and parallax.
  4. ^ 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 
  5. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日