# Mu Librae

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Star in the constellation Libra

Mu Librae Location of μ Librae (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Libra Right ascension 14h 49m 19.05130s[1] Declination −14° 08′ 56.4766″[1] Apparent magnitude (V) 5.32[2] (5.69 + 6.72[3] + 14.70[4]) Characteristics Spectral type A1pSrCrEu + A6m[3] B−V color index +0.07[2] Astrometry Radial velocity (Rv) −3.2±1.4[5] km/s Proper motion (μ) RA: −65.95[1] mas/yr Dec.: −14.54[1] mas/yr Parallax (π) 13.71±0.69 mas[1] Distance 240 ± 10 ly (73 ± 4 pc) Absolute magnitude (MV) 1.32±0.20[6] Details μ Lib A Mass 2.31±0.12[7] M☉ Radius 2.59[8] R☉ Luminosity 41.7[7] L☉ Temperature 9,592±260[7] K Rotational velocity (v sin i) 29.0±1.7[7] km/s Age 417[6] Myr μ Lib B Radius 2.59[8] R☉ Rotational velocity (v sin i) 32.0±6[8] km/s Other designations μ Lib, BD−13°3986, HD 130559, HIP 72489, HR 5523, SAO 158821[9] Database references SIMBAD data

**μ Librae** (Latinised as **Mu Librae**) is a probable [triple star](/source/Triple_star)[3] system in the [zodiac](/source/Zodiac) [constellation](/source/Constellation) of [Libra](/source/Libra_(constellation)). They have a combined [apparent visual magnitude](/source/Apparent_visual_magnitude) of 5.32,[2] which is bright enough to be faintly visible to the naked eye. With an annual [parallax shift](/source/Stellar_parallax) of 13.71 [mas](/source/Milliarcsecond),[1] the system is located at an estimated distance of around 240 [light years](/source/Light_year).

The inner pair consists of two [A-type stars](/source/A-type_star) that, as of 2006, had an [angular separation](/source/Angular_separation) of 1.79 [arc seconds](/source/Arc_second) along a [position angle](/source/Position_angle) of 5.5°.[10] They have an estimated physical separation of 139 [AU](/source/Astronomical_unit).[8] The primary, component A, is a visual magnitude 5.69[3] magnetic [Ap star](/source/Ap_star) showing overabundances of the elements aluminum, strontium, chromium, and europium.[7] Hence, it has a [stellar classification](/source/Stellar_classification) of A1pSrEuCr.[3] It is a photometric variable with periods of 25.3992±0.1970 d and 1.8871±0.0008 d. The surface magnetic field strength is 1,375 Gauss.[7]

The secondary, component B, is an [Am star](/source/Am_star) with a [stellar classification](/source/Stellar_classification) of A6m.[3] It has a visual magnitude of 6.72.[3] The tertiary member, component C, is a magnitude 14.70 star at an angular separation of 12.90 arc seconds along a position angle of 294°, as of 2000.[4]

## 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-Corben1968_2-0) [***b***](#cite_ref-Corben1968_2-1) [***c***](#cite_ref-Corben1968_2-2) Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", *Monthly Notes of the Astronomical Society of Southern Africa*, **27**: 11, [Bibcode](/source/Bibcode_(identifier)):[1968MNSSA..27...11C](https://ui.adsabs.harvard.edu/abs/1968MNSSA..27...11C).

1. ^ [***a***](#cite_ref-Eggleton2008_3-0) [***b***](#cite_ref-Eggleton2008_3-1) [***c***](#cite_ref-Eggleton2008_3-2) [***d***](#cite_ref-Eggleton2008_3-3) [***e***](#cite_ref-Eggleton2008_3-4) [***f***](#cite_ref-Eggleton2008_3-5) [***g***](#cite_ref-Eggleton2008_3-6) 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. ^ [***a***](#cite_ref-Mason2014_4-0) [***b***](#cite_ref-Mason2014_4-1) Mason, B. D.; et al. (2014), ["The Washington Visual Double Star Catalog"](http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds), *The Astronomical Journal*, **122** (6): 3466, [Bibcode](/source/Bibcode_(identifier)):[2001AJ....122.3466M](https://ui.adsabs.harvard.edu/abs/2001AJ....122.3466M), [doi](/source/Doi_(identifier)):[10.1086/323920](https://doi.org/10.1086%2F323920), retrieved 2015-07-22.

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-Kochukhov2006_6-0) [***b***](#cite_ref-Kochukhov2006_6-1) Kochukhov, O.; Bagnulo, S. (2006), "Evolutionary state of magnetic chemically peculiar stars", *Astronomy and Astrophysics*, **450** (2): 763, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0601461](https://arxiv.org/abs/astro-ph/0601461), [Bibcode](/source/Bibcode_(identifier)):[2006A&A...450..763K](https://ui.adsabs.harvard.edu/abs/2006A&A...450..763K), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20054596](https://doi.org/10.1051%2F0004-6361%3A20054596), [S2CID](/source/S2CID_(identifier)) [18596834](https://api.semanticscholar.org/CorpusID:18596834).

1. ^ [***a***](#cite_ref-Wraight2012_7-0) [***b***](#cite_ref-Wraight2012_7-1) [***c***](#cite_ref-Wraight2012_7-2) [***d***](#cite_ref-Wraight2012_7-3) [***e***](#cite_ref-Wraight2012_7-4) [***f***](#cite_ref-Wraight2012_7-5) Wraight, K. T.; et al. (February 2012), "A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars", *Monthly Notices of the Royal Astronomical Society*, **420** (1): 757–772, [arXiv](/source/ArXiv_(identifier)):[1110.6283](https://arxiv.org/abs/1110.6283), [Bibcode](/source/Bibcode_(identifier)):[2012MNRAS.420..757W](https://ui.adsabs.harvard.edu/abs/2012MNRAS.420..757W), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2011.20090.x](https://doi.org/10.1111%2Fj.1365-2966.2011.20090.x), [S2CID](/source/S2CID_(identifier)) [14811051](https://api.semanticscholar.org/CorpusID:14811051).

1. ^ [***a***](#cite_ref-Howe2009_8-0) [***b***](#cite_ref-Howe2009_8-1) [***c***](#cite_ref-Howe2009_8-2) [***d***](#cite_ref-Howe2009_8-3) Howe, K. S.; Clarke, C. J. (January 2009), "An analysis of v sin (i) correlations in early-type binaries", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **392** (1): 448–454, [Bibcode](/source/Bibcode_(identifier)):[2009MNRAS.392..448H](https://ui.adsabs.harvard.edu/abs/2009MNRAS.392..448H), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2008.14073.x](https://doi.org/10.1111%2Fj.1365-2966.2008.14073.x).

1. **[^](#cite_ref-SIMBAD_9-0)** ["mu. Lib"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=mu.+Lib). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-01-24.{{[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-Mason2007_10-0)** Mason, Brian D.; et al. (October 2007), "Speckle Interferometry at the US Naval Observatory. XIII.", *The Astronomical Journal*, **134** (4): 1671–1678, [Bibcode](/source/Bibcode_(identifier)):[2007AJ....134.1671M](https://ui.adsabs.harvard.edu/abs/2007AJ....134.1671M), [doi](/source/Doi_(identifier)):[10.1086/521555](https://doi.org/10.1086%2F521555), [S2CID](/source/S2CID_(identifier)) [250820656](https://api.semanticscholar.org/CorpusID:250820656).

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 [Mu Librae](https://en.wikipedia.org/wiki/Mu_Librae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Mu_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.