# 37 Librae

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Star in the constellation Libra

37 Librae Location of 37 Librae (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 Constellation Libra Right ascension 15h 34m 10.70209s[1] Declination −10° 03′ 52.3063″[1] Apparent magnitude (V) 4.61[2] Characteristics Evolutionary stage subgiant[3] Spectral type K1III–IV[4] B−V color index 1.00±0.03[2] Astrometry Radial velocity (Rv) +49.25±0.08[5] km/s Proper motion (μ) RA: +307.63[1] mas/yr Dec.: −234.51[1] mas/yr Parallax (π) 34.57±0.22 mas[1] Distance 94.3 ± 0.6 ly (28.9 ± 0.2 pc) Absolute magnitude (MV) 2.30[2] Details[5] Mass 1.38±0.10 M☉ Radius 5.133±0.043[6] R☉ Luminosity 12.71±0.69[6] L☉ Surface gravity (log g) 3.19±0.06 cgs Temperature 4,809±62[6] K Metallicity [Fe/H] 0.02±0.04 dex Rotational velocity (v sin i) 2.02±0.33 km/s Age 3.39±0.80 Gyr Other designations 37 Lib, BD−09°4171, FK5 1409, GC 20914, HD 138716, HIP 76219, HR 5777, SAO 140609[7] Database references SIMBAD data

**37 Librae** is a single[8] [star](/source/Star) in the southern [zodiac](/source/Zodiac) [constellation](/source/Constellation) of [Libra](/source/Libra_(constellation)). It is visible to the naked eye as a faint, orange-hued star with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.61.[2] The star is located 94 [light years](/source/Light_year) from the Sun based on [parallax](/source/Stellar_parallax), and is drifting further away with a [radial velocity](/source/Radial_velocity) of +49 km/s.[5]

This is an [evolving](/source/Stellar_evolution) [subgiant star](/source/Subgiant_star)[3] with a [stellar classification](/source/Stellar_classification) of K1 III–IV,[4] where the [luminosity class](/source/Luminosity_class) indicates the [spectrum](/source/Stellar_spectrum) displays blended traits of a subgiant and a [giant star](/source/Giant_star). It is an estimated 3.4 billion years old with 1.4 times the [mass of the Sun](/source/Mass_of_the_Sun).[5] Having the supply of hydrogen at its [core](/source/Stellar_core) all but exhausted, the star is starting to expand; currently it has five times the girth of the Sun. It is radiating 12.7 times the [Sun's luminosity](/source/Sun's_luminosity) from its enlarged [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 4,809 K.[6] At this temperature, 37 Librae glows with the hue of a [K-type star](/source/K-type_star).[9]

## 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) 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) 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-Snowden2005_3-0) [***b***](#cite_ref-Snowden2005_3-1) Snowden, Michael S.; Young, Arthur (March 2005), "Radial Velocities of Late-Type Field Subgiant Stars", *The Astrophysical Journal Supplement Series*, **157** (1): 126–137, [Bibcode](/source/Bibcode_(identifier)):[2005ApJS..157..126S](https://ui.adsabs.harvard.edu/abs/2005ApJS..157..126S), [doi](/source/Doi_(identifier)):[10.1086/423711](https://doi.org/10.1086%2F423711).

1. ^ [***a***](#cite_ref-perkins1989_4-0) [***b***](#cite_ref-perkins1989_4-1) Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", *Astrophysical Journal Supplement Series*, **71**: 245, [Bibcode](/source/Bibcode_(identifier)):[1989ApJS...71..245K](https://ui.adsabs.harvard.edu/abs/1989ApJS...71..245K), [doi](/source/Doi_(identifier)):[10.1086/191373](https://doi.org/10.1086%2F191373).

1. ^ [***a***](#cite_ref-jofre2015_5-0) [***b***](#cite_ref-jofre2015_5-1) [***c***](#cite_ref-jofre2015_5-2) [***d***](#cite_ref-jofre2015_5-3) Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", *Astronomy & Astrophysics*, **574**: A50, [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. ^ [***a***](#cite_ref-Rains2020_6-0) [***b***](#cite_ref-Rains2020_6-1) [***c***](#cite_ref-Rains2020_6-2) [***d***](#cite_ref-Rains2020_6-3) Rains, Adam D.; et al. (April 2020). ["Precision angular diameters for 16 southern stars with VLTI/PIONIER"](https://doi.org/10.1093%2Fmnras%2Fstaa282). *Monthly Notices of the Royal Astronomical Society*. **493** (2): 2377–2394. [arXiv](/source/ArXiv_(identifier)):[2004.02343](https://arxiv.org/abs/2004.02343). [Bibcode](/source/Bibcode_(identifier)):[2020MNRAS.493.2377R](https://ui.adsabs.harvard.edu/abs/2020MNRAS.493.2377R). [doi](/source/Doi_(identifier)):[10.1093/mnras/staa282](https://doi.org/10.1093%2Fmnras%2Fstaa282).

1. **[^](#cite_ref-SIMBAD_7-0)** ["37 Lib"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=37+Lib). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2019-07-17.

1. **[^](#cite_ref-Eggleton2008_8-0)** 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-csiro_9-0)** ["The Colour of Stars"](https://web.archive.org/web/20131203222826/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html), *Australia Telescope, Outreach and Education*, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from [the original](http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html) on 2013-12-03, retrieved 2012-01-16

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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