# 11 Librae

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Star in the constellation Libra

11 Librae Observation data Epoch J2000 Equinox J2000 Constellation Libra Right ascension 14h 51m 01.07273s[1] Declination −02° 17′ 56.9488″[1] Apparent magnitude (V) 4.93[2] Characteristics Evolutionary stage red clump[3][4] Spectral type K0 III-IV[2] B−V color index 0.988±0.001[2] Astrometry Radial velocity (Rv) +83.60±0.06[5] km/s Proper motion (μ) RA: +89.97[1] mas/yr Dec.: −124.57[1] mas/yr Parallax (π) 14.92±0.40 mas[1] Distance 219 ± 6 ly (67 ± 2 pc) Absolute magnitude (MV) 0.80[2] Details[5] Mass 1.10±0.22 M☉ Radius 10.32±0.60 R☉ Luminosity 59+15 −12 L☉ Surface gravity (log g) 2.42±0.09 cgs Temperature 4,749±54 K Metallicity [Fe/H] −0.32±0.09 dex Rotational velocity (v sin i) 3.74±0.48 km/s Age 5.05±2.67 Myr Other designations 11 Lib, BD−01°2991, HD 130952, HIP 72631, HR 5535, SAO 140176[6] Database references SIMBAD data

**11 Librae** is a single,[7] fifth-magnitude [star](/source/Star) in the southern [zodiac](/source/Zodiac) [constellation](/source/Constellation) of [Libra](/source/Libra_(constellation)). It is faintly visible to the naked eye with an [apparent visual magnitude](/source/Apparent_visual_magnitude) is 4.93.[2] The star is moving further from the Sun with a heliocentric [radial velocity](/source/Radial_velocity) of +83.6 km/s.[5] The distance to this star, as estimated from its annual [parallax shift](/source/Stellar_parallax) of 14.92±0.40 [mas](/source/Milliarcsecond),[1] is about 219 [light years](/source/Light_year).

This star has a [stellar classification](/source/Stellar_classification) of K0 III/IV,[8] indicating the [spectrum](/source/Stellar_spectrum) displays mixed traits of a [giant](/source/Giant_star)/[subgiant](/source/Subgiant_star) [K-type star](/source/K-type_star). Alves (2000) and Afşar et al. (2012) classify it as a [red clump](/source/Red_clump) star, which means it is an [evolved](/source/Stellar_evolution) star at the cool end of the [horizontal branch](/source/Horizontal_branch) and is generating energy through [helium fusion](/source/Helium_fusion) in its [core region](/source/Stellar_core).[3][4] It is about five billion years old and is spinning with a [projected rotational velocity](/source/Projected_rotational_velocity) of 4 km/s. The star has 1.1 times the [mass of the Sun](/source/Mass_of_the_Sun) and has expanded to over 10 times the [Sun's radius](/source/Sun's_radius). It is radiating around 59 times the [Sun's radius](/source/Sun's_radius) from its enlarged [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of about 4,749 K.[5]

## References

1. ^ [***a***](#cite_ref-vanLeeuwen2007_1-0) [***b***](#cite_ref-vanLeeuwen2007_1-1) [***c***](#cite_ref-vanLeeuwen2007_1-2) [***d***](#cite_ref-vanLeeuwen2007_1-3) [***e***](#cite_ref-vanLeeuwen2007_1-4) [***f***](#cite_ref-vanLeeuwen2007_1-5) 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-Anderson2012_2-0) [***b***](#cite_ref-Anderson2012_2-1) [***c***](#cite_ref-Anderson2012_2-2) [***d***](#cite_ref-Anderson2012_2-3) [***e***](#cite_ref-Anderson2012_2-4) Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", *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), [S2CID](/source/S2CID_(identifier)) [119257644](https://api.semanticscholar.org/CorpusID:119257644).

1. ^ [***a***](#cite_ref-Alves2000_3-0) [***b***](#cite_ref-Alves2000_3-1) Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", *The Astrophysical Journal*, **539** (2): 732−741, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0003329](https://arxiv.org/abs/astro-ph/0003329), [Bibcode](/source/Bibcode_(identifier)):[2000ApJ...539..732A](https://ui.adsabs.harvard.edu/abs/2000ApJ...539..732A), [doi](/source/Doi_(identifier)):[10.1086/309278](https://doi.org/10.1086%2F309278), [S2CID](/source/S2CID_(identifier)) [16673121](https://api.semanticscholar.org/CorpusID:16673121).

1. ^ [***a***](#cite_ref-Afsar2012_4-0) [***b***](#cite_ref-Afsar2012_4-1) Afşar, M.; et al. (July 2012), "Chemical Compositions of Thin-disk, High-metallicity Red Horizontal-branch Field Stars", *The Astronomical Journal*, **144** (1): 20, [arXiv](/source/ArXiv_(identifier)):[1205.3659](https://arxiv.org/abs/1205.3659), [Bibcode](/source/Bibcode_(identifier)):[2012AJ....144...20A](https://ui.adsabs.harvard.edu/abs/2012AJ....144...20A), [doi](/source/Doi_(identifier)):[10.1088/0004-6256/144/1/20](https://doi.org/10.1088%2F0004-6256%2F144%2F1%2F20), [S2CID](/source/S2CID_(identifier)) [119249237](https://api.semanticscholar.org/CorpusID:119249237), 20.

1. ^ [***a***](#cite_ref-Jofré2015_5-0) [***b***](#cite_ref-Jofré2015_5-1) [***c***](#cite_ref-Jofré2015_5-2) [***d***](#cite_ref-Jofré2015_5-3) Jofré, E.; et al. (February 2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", *Astronomy & Astrophysics*, **574**: 46, [arXiv](/source/ArXiv_(identifier)):[1410.6422](https://arxiv.org/abs/1410.6422), [Bibcode](/source/Bibcode_(identifier)):[2015A&A...574A..50J](https://ui.adsabs.harvard.edu/abs/2015A&A...574A..50J), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201424474](https://doi.org/10.1051%2F0004-6361%2F201424474), [S2CID](/source/S2CID_(identifier)) [53666931](https://api.semanticscholar.org/CorpusID:53666931), A50.

1. **[^](#cite_ref-SIMBAD_6-0)** ["11 Lib"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=11+Lib). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2018-03-01.

1. **[^](#cite_ref-Eggleton2008_7-0)** 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](/source/ArXiv_(identifier)):[0806.2878](https://arxiv.org/abs/0806.2878), [Bibcode](/source/Bibcode_(identifier)):[2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111%2Fj.1365-2966.2008.13596.x), [S2CID](/source/S2CID_(identifier)) [14878976](https://api.semanticscholar.org/CorpusID:14878976).

1. **[^](#cite_ref-Houk1999_8-0)** Houk, N.; Swift, C. (1999), "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars", *Michigan Spectral Survey*, **5**, [Bibcode](/source/Bibcode_(identifier)):[1999MSS...C05....0H](https://ui.adsabs.harvard.edu/abs/1999MSS...C05....0H).

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 [11 Librae](https://en.wikipedia.org/wiki/11_Librae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/11_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.