# Alpha Librae

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Quadruple star in the constellation Libra

α Librae Location of α Librae (circled) Observation data Epoch J2000.0 Equinox ICRS Constellation Libra α1 Lib (α Lib B) Right ascension 14h 50m 41.18097s[1] Declination −15° 59′ 50.0482″[1] Apparent magnitude (V) +5.153[2] α2 Lib (α Lib A) Right ascension 14h 50m 52.71309s[1] Declination −16° 02′ 30.3955″[1] Apparent magnitude (V) +2.741[2] Characteristics α1 Lib Spectral type F3 V[3] + M0–1 V[4] U−B color index −0.02[5] B−V color index +0.39[5] α2 Lib Evolutionary stage Main sequence[6][7] or blue straggler (α2 A)[8] Spectral type kA2hA5mA4 IV-V[9] U−B color index +0.10[5] B−V color index +0.15[5] Astrometry α1 Lib Radial velocity (Rv) −23.8±0.3[10] km/s Proper motion (μ) RA: −136.27[1] mas/yr Dec.: −59.04[1] mas/yr Parallax (π) 43.52±0.43 mas[1] Distance 74.9 ± 0.7 ly (23.0 ± 0.2 pc) Absolute magnitude (MV) +3.35[11] α2 Lib Proper motion (μ) RA: −105.68[1] mas/yr Dec.: −68.40[1] mas/yr Parallax (π) 43.03±0.19 mas[1] Distance 75.8 ± 0.3 ly (23.2 ± 0.1 pc) Absolute magnitude (MV) +0.88[12] Orbit[13] Primary α1 Lib A Name α1 Lib B Period (P) 16.229±0.043 yr Semi-major axis (a) 0.346±0.006″ Eccentricity (e) 0.244±0.008 Inclination (i) 54.4±1.5° Longitude of the node (Ω) 122.7±1.4° Periastron epoch (T) 2021.95±0.12 Argument of periastron (ω) (secondary) 184.1±3.3° Semi-amplitude (K1) (primary) 3.83±0.12 km/s Orbit[10] Primary α2 Lib A Name α2 Lib B Period (P) 70.34±0.07 days Semi-major axis (a) 0.52[8] au Eccentricity (e) 0.41±0.02 Inclination (i) 71±3[8]° Longitude of the node (Ω) 333±17[8]° Periastron epoch (T) JD 2455294.3±0.5 Argument of periastron (ω) (secondary) 48±7° Semi-amplitude (K2) (secondary) 43.1±0.5 km/s Details α2 Lib A Mass 1.95[8] M☉ Radius 2.21[8] R☉ Surface gravity (log g) 3.91[9] cgs Temperature 8,200[8] K Age 700[8] Myr α2 Lib B Mass 1.79[8] M☉ Radius 1.92[8] R☉ Temperature 7,930[8] K Age 700[8] Myr α1 Lib A Mass 1.36±0.02[14] M☉ Radius 1.50[15] R☉ Luminosity 3.83[14] L☉ Surface gravity (log g) 4.23[14] cgs Temperature 6,707±56[14] K Metallicity [Fe/H] −0.03[14] dex Rotational velocity (v sin i) 5.95[14] km/s Age 1.01±0.24[14] Gyr α1 Lib B Mass 0.5–0.6[4] M☉ Other designations Zubenelgenubi, Kiffa Australis, Lanx Australis, α Lib, WDS J14509-1603 α Lib B: α1 Lib, 8 Librae, BD−15°3965, FK5 1387, HD 130819, HIP 72603, HR 5530, SAO 158836[16] α Lib A: α2 Lib, 9 Librae, BD−15°3966, FK5 548, HD 130841, HIP 72622, HR 5531, SAO 158840[17] Database references SIMBAD α1 Lib α2 Lib

**Alpha Librae** (**α Librae**, abbreviated **Alpha Lib**, **α Lib**) is a quadruple star system and, despite its '[alpha](/source/Alpha)' designation, it is the second-brightest star in the [constellation](/source/Constellation) of [Libra](/source/Libra_(constellation)). The two components are designated **α1 Librae** and **α2 Librae**. The system bore the traditional name of **Zubenelgenubi** [/zuːˌbɛnɛldʒɪˈnuːbi/](https://en.wikipedia.org/wiki/Help:IPA/English),[18] though the [International Astronomical Union](/source/International_Astronomical_Union) now regards that name as only applying to α2 Librae.[19]

Alpha2 Librae is 0.33 degrees north of the [ecliptic](/source/Ecliptic) so it can be [occulted](/source/Occultation) by the [Moon](/source/Moon) and (very rarely) by [planets](/source/Planet). It was occulted by [Venus](/source/Venus) on October 25, 1947;[20] the next occultation by a planet will be by [Mercury](/source/Mercury_(planet)) on 10 November 2052.[21] Both components are eclipsed ([occulted](/source/Occultation)) by the sun from about 7–9 November.[22] Thus the star can be viewed the whole night, crossing the sky, in early May.

## Nomenclature

*α Librae* ([Latinised](/source/Latinisation_of_names) to *Alpha Librae*) is the system's [Bayer designation](/source/Bayer_designation).

*Zubenelgenubi* [/ˌzuːbənɛldʒəˈnuːbi/](https://en.wikipedia.org/wiki/Help:IPA/English), also rendered *Zuben Elgenubi*, derives from the [Arabic](/source/Arabic) ّالزُبَانَى الجَنُوبِي *al-zubānā al-janūbiyy* "the southern claw", which was coined before Libra was recognized as a constellation distinct from [Scorpius](/source/Scorpius). The alternative name *Kiffa Australis* (*Elkhiffa Australis*) is a partial [Latin](/source/Latin) translation of the Arabic *al-kiffah al-janubiyyah* *الكفة الجنوبية* "southern pan [of the scales]". Another name used in older astronomy texts, equivalent to "southern pan", was *Lanx Australis*.[23]

In 2016, the [International Astronomical Union](/source/International_Astronomical_Union) organized a [Working Group on Star Names](/source/IAU_Working_Group_on_Star_Names) (WGSN)[24] to catalogue and standardize proper names for stars. The WGSN approved the name *Zubenelgenubi* for *α2 Librae* on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names.[19]

In [Chinese](/source/Chinese_astronomy), 氐宿 (*Dī Xiù*), meaning *[Root](/source/Root_(Chinese_constellation))*, refers to an [asterism](/source/Asterism_(astronomy)) consisting of α2 Librae, [ι Librae](/source/Iota_Librae), [γ Librae](/source/Gamma_Librae) and [β Librae](/source/Beta_Librae).[25] Consequently, the [Chinese name](/source/Chinese_star_names) for α2 Librae itself is 氐宿一 (*Dī Xiù yī*), "the First Star of Root".[26]

## Properties

Aa α2 Lib (70.3 days) Ab 231″ separation Ba α1 Lib (16.3 years) Bb

Hierarchy of orbits in the α Librae system

Alpha Librae is about 77 [light-years](/source/Light-year) (24 [parsecs](/source/Parsec)) from the [Sun](/source/Sun). The two brightest components of Alpha Librae form a [double star](/source/Double_star) moving together through space as [common proper motion](/source/Common_proper_motion) companions. They are separated in the sky by an [angular distance](/source/Angular_size) of 231" (3'51"). The [position angle](/source/Position_angle) of the companion is 314 degrees. The brighter of the two is a white star of [spectral type](/source/Stellar_classification) A3, with an [apparent magnitude](/source/Apparent_magnitude) of 2.8. Its companion is a type F4 star of apparent brightness 5.2. They are probably members of the [Castor Moving Group](/source/Castor_Moving_Group) of stars that have a similar motion through space and share a common origin some 200 million years ago.[4]

### Alpha2 Librae

The brightest member, α2 Librae or α Librae A, is itself a [spectroscopic binary](/source/Spectroscopic_binary) system. The components have similar masses (mass ratio of 0.92) but the primary has a rotational velocity three times higher than its companion, which could be caused by them having significantly misaligned spin axes or if the primary is a merger product.[8]

### Alpha1 Librae

The second member, α1 Librae or α Librae B, is separated from the primary system by around 5,360 [AU](/source/Astronomical_unit).[8] It too is a spectroscopic binary with an orbital period of 5,870 days and an [angular separation](/source/Angular_separation) of 0.383 arcseconds;[13] equal to about 9 au.[8]

### KU Librae

The system may have a fifth component, the star KU Librae at a separation of 2.6°, thus forming a hierarchical quintuple star system. KU Lib shares a similar motion through space to the Alpha Librae system, but is separated from the other stars by about a [parsec](/source/Parsec). It is sufficiently close to be gravitationally bound to the other members,[4] but has a substantially different [metallicity](/source/Metallicity), making it unlikely to be physically bound to the system.[27]

## See also

- [List of stars in Libra](/source/List_of_stars_in_Libra)

## References

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## External links

- Kaler, Jim (2004). ["STARS: Zubenelgenubi"](https://web.archive.org/web/20050818161632/http://www.astro.uiuc.edu/~kaler/sow/zubenel.html). Retrieved July 10, 2005.

- Alpha Librae on [WikiSky](/source/WikiSky): [DSS2](http://www.wikisky.org/?object=Alpha+Librae&img_source=DSS2), [SDSS](http://www.wikisky.org/?object=Alpha+Librae&img_source=SDSS), [GALEX](http://www.wikisky.org/?object=Alpha+Librae&img_source=GALEX), [IRAS](http://www.wikisky.org/?object=Alpha+Librae&img_source=IRAS), [Hydrogen α](http://www.wikisky.org/?object=Alpha+Librae&img_source=HALPHA), [X-Ray](http://www.wikisky.org/?object=Alpha+Librae&img_source=RASS), [Astrophoto](http://www.wikisky.org/?object=Alpha+Librae&img_source=IMG_all), [Sky Map](http://www.wikisky.org/?object=Alpha+Librae), [Articles and images](http://www.wikisky.org/starview?object=Alpha+Librae)

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 [Alpha Librae](https://en.wikipedia.org/wiki/Alpha_Librae) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Alpha_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.