Beta Lacertae

β Lacertae

β Lacertae in optical light
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]
Distance170 ± 1 ly
(52.1 ± 0.4 pc)
Absolute magnitude (MV)+0.67[5]
Details[5]
Mass0.97±0.21[3] M☉
Radius10.96±0.23[3] R☉
Luminosity57.7±3.0[3] L☉
Surface gravity (log g)2.43 cgs
Temperature4803±75[3] K
Metallicity [Fe/H]−0.33 dex
Rotational velocity (v sin i)< 17[4] km/s
Age6.76±3.59[3] 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[2]
Database references
SIMBADdata

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]

  1. ^ a b c d e f Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Simbad was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Baines2018 was invoked but never defined (see the help page).
  4. ^ 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.
  5. ^ a b c Cite error: The named reference Takeda2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Mishenina2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).