# Kappa Librae

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Star in the constellation Libra

Kappa Librae Location of κ Librae (circled in red) Observation data Epoch J2000 Equinox J2000 Constellation Libra[1] Right ascension 15h 41m 56.79858s[2] Declination −19° 40′ 43.7745″[2] Apparent magnitude (V) 4.72[3] Characteristics Spectral type K5 III[4] U−B color index +1.94[3] B−V color index +1.58[3] Astrometry Radial velocity (Rv) −4.5±1.5[5] km/s Proper motion (μ) RA: −32.06[2] mas/yr Dec.: −103.15[2] mas/yr Parallax (π) 10.57±1.40 mas[2] Distance approx. 310 ly (approx. 90 pc) Absolute magnitude (MV) −0.62[1] Details Mass 1.6[6] M☉ Radius 38[7] R☉ Luminosity 388[8] L☉ Surface gravity (log g) 1.35[6] cgs Temperature 3,875[7] K Metallicity [Fe/H] −0.39[6] dex Other designations κ Lib, 43 Lib, BD−19°4188, FK5 1413, HD 139997, HIP 76880, HR 5838, SAO 159442[9] Database references SIMBAD data

**Kappa Librae** is a [star system](/source/Star_system) in the [zodiac](/source/Zodiac) [constellation](/source/Constellation) of [Libra](/source/Libra_(constellation)). Its name is a [Bayer designation](/source/Bayer_designation) that is [Latinized](/source/Romanization_of_Greek) from **κ Librae**, and abbreviated Kappa Lib or κ Lib. Its [apparent visual magnitude](/source/Apparent_visual_magnitude) is 4.72,[3] so it can be seen with the naked eye. The annual [parallax shift](/source/Stellar_parallax) of 10.57 [mas](/source/Milliarcsecond)[2] indicates it is roughly 310 [light years](/source/Light_year) away. It is positioned 0.02 degrees south of the [ecliptic](/source/Ecliptic).

The star shows acceleration components in its [proper motion](/source/Proper_motion), indicating with high probability that it is an [astrometric binary](/source/Astrometric_binary).[10] The visible component is an [evolved](/source/Stellar_evolution) [K-type](/source/K-type_star) [giant star](/source/Giant_star) with a [stellar classification](/source/Stellar_classification) of K5 III.[4] It is a suspected [variable star](/source/Variable_star) with a brightness that ranges between 4.70 and 4.75.[11] Kappa Librae is 38 times larger than the Sun,[7] and is radating 388 times the [solar luminosity](/source/Solar_luminosity)[8] from its [outer atmosphere](/source/Stellar_atmosphere) at an [effective temperature](/source/Effective_temperature) of 3,875 [K](/source/Kelvin).[7]

In [Chinese astronomy](/source/Chinese_astronomy), Kappa Librae is called 日, [Pinyin](/source/Pinyin): Rì, meaning *Sun*, because this star is marking itself and stand alone in *Sun* asterism, [Room](/source/Room_(Chinese_constellation)) mansion (see: [Chinese constellations](/source/Chinese_constellations)).[12]

## References

1. ^ [***a***](#cite_ref-Anderson2012_1-0) [***b***](#cite_ref-Anderson2012_1-1) Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *[Astronomy Letters](/source/Astronomy_Letters)*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015). [XHIP record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ681510a8389ecb&-out.src=V%2F137D%2FXHIP&-nav=cat%3AV%2F137D%26tab%3A{V%2F137D%2FXHIP}%26key%3Asource%3DV%2F137D%2FXHIP%26HTTPPRM%3A&-source=V%2F137D%2FXHIP&-out=HIP&HIP=76880&-out=Comp&-out=Gr&-out=RAJ2000&-out=DEJ2000&-out=Dist&-out=X&-out=Y&-out=Z&-out=SpType&-out=Simbad&-out=Hpmag&-out=Lum&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-vanLeeuwen2007_2-0) [***b***](#cite_ref-vanLeeuwen2007_2-1) [***c***](#cite_ref-vanLeeuwen2007_2-2) [***d***](#cite_ref-vanLeeuwen2007_2-3) [***e***](#cite_ref-vanLeeuwen2007_2-4) [***f***](#cite_ref-vanLeeuwen2007_2-5) van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", *Astronomy and Astrophysics*, **474** (2): 653–664, [arXiv](/source/ArXiv_(identifier)):[0708.1752](https://arxiv.org/abs/0708.1752), [Bibcode](/source/Bibcode_(identifier)):[2007A&A...474..653V](https://ui.adsabs.harvard.edu/abs/2007A&A...474..653V), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20078357](https://doi.org/10.1051%2F0004-6361%3A20078357), [S2CID](/source/S2CID_(identifier)) [18759600](https://api.semanticscholar.org/CorpusID:18759600).

1. ^ [***a***](#cite_ref-Johnson1966_3-0) [***b***](#cite_ref-Johnson1966_3-1) [***c***](#cite_ref-Johnson1966_3-2) [***d***](#cite_ref-Johnson1966_3-3) Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", *Communications of the Lunar and Planetary Laboratory*, **4** (99): 99, [Bibcode](/source/Bibcode_(identifier)):[1966CoLPL...4...99J](https://ui.adsabs.harvard.edu/abs/1966CoLPL...4...99J).

1. ^ [***a***](#cite_ref-houk1978_4-0) [***b***](#cite_ref-houk1978_4-1) Houk, Nancy; Smith-Moore, M. (1978), *Michigan catalogue of two-dimensional spectral types for the HD stars*, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, [Bibcode](/source/Bibcode_(identifier)):[1988mcts.book.....H](https://ui.adsabs.harvard.edu/abs/1988mcts.book.....H).

1. **[^](#cite_ref-deBruijne2012_5-0)** de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", *Astronomy & Astrophysics*, **546**: 14, [arXiv](/source/ArXiv_(identifier)):[1208.3048](https://arxiv.org/abs/1208.3048), [Bibcode](/source/Bibcode_(identifier)):[2012A&A...546A..61D](https://ui.adsabs.harvard.edu/abs/2012A&A...546A..61D), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201219219](https://doi.org/10.1051%2F0004-6361%2F201219219), [S2CID](/source/S2CID_(identifier)) [59451347](https://api.semanticscholar.org/CorpusID:59451347), A61.

1. ^ [***a***](#cite_ref-kaltenegger2021_6-0) [***b***](#cite_ref-kaltenegger2021_6-1) [***c***](#cite_ref-kaltenegger2021_6-2) Kaltenegger, L.; Faherty, J. K. (2021), "Past, present and future stars that can see Earth as a transiting exoplanet", *Nature*, **594** (7864): 505–507, [arXiv](/source/ArXiv_(identifier)):[2107.07936](https://arxiv.org/abs/2107.07936), [Bibcode](/source/Bibcode_(identifier)):[2021Natur.594..505K](https://ui.adsabs.harvard.edu/abs/2021Natur.594..505K), [doi](/source/Doi_(identifier)):[10.1038/s41586-021-03596-y](https://doi.org/10.1038%2Fs41586-021-03596-y), [PMID](/source/PMID_(identifier)) [34163055](https://pubmed.ncbi.nlm.nih.gov/34163055)

1. ^ [***a***](#cite_ref-tycho-gaia_7-0) [***b***](#cite_ref-tycho-gaia_7-1) [***c***](#cite_ref-tycho-gaia_7-2) [***d***](#cite_ref-tycho-gaia_7-3) McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", *Monthly Notices of the Royal Astronomical Society*, **471**: 770–791, [arXiv](/source/ArXiv_(identifier)):[1706.02208](https://arxiv.org/abs/1706.02208), [Bibcode](/source/Bibcode_(identifier)):[2017MNRAS.471..770M](https://ui.adsabs.harvard.edu/abs/2017MNRAS.471..770M), [doi](/source/Doi_(identifier)):[10.1093/mnras/stx1433](https://doi.org/10.1093%2Fmnras%2Fstx1433), [ISSN](/source/ISSN_(identifier)) [0035-8711](https://search.worldcat.org/issn/0035-8711). [Kappa Librae's database entry](https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/MNRAS/471/770&RAJ2000=235.486659) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-dr2_8-0) [***b***](#cite_ref-dr2_8-1) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%206253982698110532608) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-SIMBAD_9-0)** ["kap Lib"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=kap+Lib). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-01-30.{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: postscript ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_postscript))

1. **[^](#cite_ref-Makarov2005_10-0)** Makarov, V. V.; Kaplan, G. H. (May 2005), ["Statistical Constraints for Astrometric Binaries with Nonlinear Motion"](https://apps.dtic.mil/sti/pdfs/ADA433654.pdf) (PDF), *The Astronomical Journal*, **129** (5): 2420–2427, [Bibcode](/source/Bibcode_(identifier)):[2005AJ....129.2420M](https://ui.adsabs.harvard.edu/abs/2005AJ....129.2420M), [doi](/source/Doi_(identifier)):[10.1086/429590](https://doi.org/10.1086%2F429590), [archived](https://web.archive.org/web/20170924050424/http://www.dtic.mil/get-tr-doc/pdf?AD=ADA433654) from the original on September 24, 2017.

1. **[^](#cite_ref-Samus2004_11-0)** Samus, N. N.; Durlevich, O. V.; et al. (2004), "Combined General Catalogue of Variable Stars (GCVS4.2)", *Vizier Online Data Catalog*, [Bibcode](/source/Bibcode_(identifier)):[2004yCat.2250....0S](https://ui.adsabs.harvard.edu/abs/2004yCat.2250....0S).

1. **[^](#cite_ref-ridpathlibra_12-0)** [Ian Ridpath's Startales - Libra the Scales](http://www.ianridpath.com/startales/libra.htm#chinese)

v t e Constellation of Libra List of stars in Libra Libra in Chinese astronomy Stars Bayer α1 α2 (Zubenelgenubi) β (Zubeneschamali) γ (Zubenelhakrabi) δ ε ζ1 ζ2 ζ3 ζ4 η θ ι1 ι2 κ λ μ ν ξ1 ξ2 ο σ (Brachium) τ υ Flamsteed 2 3 4 5 10 11 12 16 17 18 22 23 26 28 30 36 37 41 42 47 48 49 50 Variable HN HO KU KX HR 5504 5455 HD 133131 134439 134440 135485 137010 139139 140283 141569 141937 Other 2M1510 2MASS 1507−1627 CWISEP J1446−2317 HE 1523−0901 WASP-57 WISE 1534−1043 WISE 1541−2250 Exoplanets 23 Librae b c Gliese 581b c e HD 137010 b (unconfirmed) K2-315b WASP-189b Star clusters NGC 5897 Galaxies NGC 5597 5605 5716 5728 5792 5793 5861 5885 5890 5898 5915 5917 Other AP Librae IC 1059 IRAS 14348−1447 PKS 1510−089 PKS 1519−273 QSO B1524−136 RXC J1504.1−0248 BCG Category

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Adapted from the Wikipedia article [Kappa Librae](https://en.wikipedia.org/wiki/Kappa_Librae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Kappa_Librae?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.