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[1] mas
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
	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
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 arc seconds.[7]

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, the Chinese name for β Lacertae itself is 螣蛇十 (Téng Shé shí, English: the Tenth Star of Flying Serpent)[8]

gollark: It's also quite weakly typed, has a BEES standard library, and poor tooling.

gollark: > 10. No true cross platform support.I mean, mono works, although obviously native APIs won't work.

gollark: > 9. Need to learn new language... yes, you need to learn a language to use it.

gollark: > 8. C# for large scale projectsThey are saying C++ would be *easier* to scale. This does not seem to match with reality, where you'll probably debug some weird memory corruption issue in some random code somewhere in a big C++ app.

gollark: Oh, it's just a bit slow.

References

van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
"bet Lac". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 17, 2008.
Baines, Ellyn K.; et al. (2018). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 155. 30. arXiv:1712.08109. Bibcode:2018AJ....155...30B. doi:10.3847/1538-3881/aa9d8b.
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.
Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781.
Mishenina, T. V.; et al. (September 2006), "Elemental abundances in the atmosphere of clump giants", Astronomy and Astrophysics, 456 (3): 1109–1120, arXiv:astro-ph/0605615, Bibcode:2006A&A...456.1109M, doi:10.1051/0004-6361:20065141.
Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
(in 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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[van_Leeuwen2007-1] van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry

[Simbad-2] "bet Lac". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 17, 2008.

[Baines2018-3] Baines, Ellyn K.; et al. (2018). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 155. 30. arXiv:1712.08109. Bibcode:2018AJ....155...30B. doi:10.3847/1538-3881/aa9d8b.

[bsc1-4] 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.

[Takeda2008-5] Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781.

[Mishenina2006-6] Mishenina, T. V.; et al. (September 2006), "Elemental abundances in the atmosphere of clump giants", Astronomy and Astrophysics, 456 (3): 1109–1120, arXiv:astro-ph/0605615, Bibcode:2006A&A...456.1109M, doi:10.1051/0004-6361:20065141.

[Eggleton2008-7] Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.

[8] (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 7 日