# Zeta Lupi

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Brighter component of a wide double star system in the constellation Lupus

ζ Lupi Location of ζ Lupi (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus Right ascension 15h 12m 17.09595s[1] Declination −52° 05′ 57.2919″[1] Apparent magnitude (V) 3.41[2] (3.50 + 6.74)[3] Characteristics Spectral type G7 III[4] U−B color index +0.66[2] B−V color index +0.92[2] Astrometry Radial velocity (Rv) −10.0±0.6[5] km/s Proper motion (μ) RA: −112.92[1] mas/yr Dec.: −71.18[1] mas/yr Parallax (π) 27.80±0.15 mas[1] Distance 117.3 ± 0.6 ly (36.0 ± 0.2 pc) Absolute magnitude (MV) 0.65[6] Details[7] ζ Lup A Mass 2.56±0.10 M☉ Radius 9.00±0.18 R☉ Luminosity 49.9±1.7 L☉ Surface gravity (log g) 2.930±0.094 cgs Temperature 5,114±36 K Metallicity [Fe/H] 0.022±0.024 dex Other designations ζ Lup, CD−51°8830, FK5 558, GJ 9512 A, HD 134505, HIP 74395, HR 5649, SAO 242304, WDS J15123-5206A[8] Database references SIMBAD data

**ζ Lupi** (Latinised as **Zeta Lupi**) is the brighter component of a wide [double star](/source/Double_star) in the [constellation](/source/Constellation) [Lupus](/source/Lupus_(constellation)), consisting of an orange-hued primary and a fainter secondary with a golden-yellow hue.[9] It is visible to the naked eye with a combined [apparent visual magnitude](/source/Apparent_visual_magnitude) of 3.41.[2] Based upon an annual [parallax shift](/source/Stellar_parallax) of 27.80[1] [mas](/source/Milliarcsecond) as seen from Earth, it is located 117.3 [light-years](/source/Light-year) from the [Sun](/source/Sun).

This is a probable [binary star](/source/Binary_star) system.[10] As of 2013, the pair had an [angular separation](/source/Angular_separation) of 71.20 [arcseconds](/source/Arcsecond) along a [position angle](/source/Position_angle) of 249°.[3] The primary, component A, is an [evolved](/source/Stellar_evolution) [G-type](/source/G-type_star) [giant star](/source/Giant_star) with a visual magnitude of 3.50[3] and a [stellar classification](/source/Stellar_classification) of G7 III.[4] This is a [red clump](/source/Red_clump) star, indicating that it is generating energy through the [thermonuclear fusion](/source/Thermonuclear_fusion) of helium in its [core region](/source/Stellar_core).[11] It is 2.6 times more massive than the Sun and nine times larger. Zeta Lupi is 50 times more luminous than the Sun, emitting this energy from its [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 5114 K.[7]

The secondary, component B, has a visual magnitude of 6.74.[3]

## 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-Johnson1966_2-0) [***b***](#cite_ref-Johnson1966_2-1) [***c***](#cite_ref-Johnson1966_2-2) [***d***](#cite_ref-Johnson1966_2-3) 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-WDSC2014_3-0) [***b***](#cite_ref-WDSC2014_3-1) [***c***](#cite_ref-WDSC2014_3-2) [***d***](#cite_ref-WDSC2014_3-3) 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): 3466–3471, [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. ^ [***a***](#cite_ref-Gray2006_4-0) [***b***](#cite_ref-Gray2006_4-1) Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", *[The Astronomical Journal](/source/The_Astronomical_Journal)*, **132** (1): 161–170, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0603770](https://arxiv.org/abs/astro-ph/0603770), [Bibcode](/source/Bibcode_(identifier)):[2006AJ....132..161G](https://ui.adsabs.harvard.edu/abs/2006AJ....132..161G), [doi](/source/Doi_(identifier)):[10.1086/504637](https://doi.org/10.1086%2F504637), [S2CID](/source/S2CID_(identifier)) [119476992](https://api.semanticscholar.org/CorpusID:119476992).

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. **[^](#cite_ref-Pizzolato2000_6-0)** Pizzolato, N.; et al. (September 2000), "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases", *Astronomy and Astrophysics*, **361**: 614–628, [Bibcode](/source/Bibcode_(identifier)):[2000A&A...361..614P](https://ui.adsabs.harvard.edu/abs/2000A&A...361..614P).

1. ^ [***a***](#cite_ref-ottoni_7-0) [***b***](#cite_ref-ottoni_7-1) Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V.; Marmier, M.; Mayor, M.; Santos, N. C.; Sousa, S. G.; Lagarde, N.; Charbonnel, C. (2022-01-01). "CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars". *Astronomy and Astrophysics*. **657**: A87. [arXiv](/source/ArXiv_(identifier)):[2201.01528](https://arxiv.org/abs/2201.01528). [Bibcode](/source/Bibcode_(identifier)):[2022A&A...657A..87O](https://ui.adsabs.harvard.edu/abs/2022A&A...657A..87O). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202040078](https://doi.org/10.1051%2F0004-6361%2F202040078). [ISSN](/source/ISSN_(identifier)) [0004-6361](https://search.worldcat.org/issn/0004-6361). [Zeta Lupi's database entry](https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A+A/657/A87&HD=134505) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-SIMBAD_8-0)** ["zet Lup"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=zet+Lup). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-03-03.

1. **[^](#cite_ref-Streicher2007_9-0)** Streicher, M. (June 2007), "Lupus: a wild animal", *Monthly Notes of the Astronomical Society of South Africa*, **66** (5 and 6): 124–127, [Bibcode](/source/Bibcode_(identifier)):[2007MNSSA..66..124S](https://ui.adsabs.harvard.edu/abs/2007MNSSA..66..124S).

1. **[^](#cite_ref-Eggleton2008_10-0)** Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", *[Monthly Notices of the Royal Astronomical Society](/source/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-laney2012_11-0)** Laney, C. D.; et al. (2012). ["A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars"](https://doi.org/10.1111%2Fj.1365-2966.2011.19826.x). *Monthly Notices of the Royal Astronomical Society*. **419** (2): 1637. [arXiv](/source/ArXiv_(identifier)):[1109.4800](https://arxiv.org/abs/1109.4800). [Bibcode](/source/Bibcode_(identifier)):[2012MNRAS.419.1637L](https://ui.adsabs.harvard.edu/abs/2012MNRAS.419.1637L). [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2011.19826.x](https://doi.org/10.1111%2Fj.1365-2966.2011.19826.x). [S2CID](/source/S2CID_(identifier)) [117788450](https://api.semanticscholar.org/CorpusID:117788450).

v t e Constellation of Lupus List of stars in Lupus Lupus in Chinese astronomy Stars Bayer α (Uridim) β γ δ ε ζ η θ ι κ λ μ ν1 ν2 ξ ο π ρ σ τ1 τ2 υ φ1 φ2 χ ψ1 ψ2 ω Flamsteed 1 (i) 2 (f) Variable RU EX GG GQ HR II IL IM KT (d) V407 V462 HR 5362 5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967 HD 134004 135344 136164 141943 142527 143811 Other Gliese 588 HIP 70849 Lupus-TR-3 SSSPM J1549−3544 WASP-132 Exoplanets GQ Lupi b HIP 70849 b Lupus-TR-3b WASP-178b Star clusters NGC 5749 NGC 5822 NGC 5824 NGC 5927 NGC 5986 Nebulae IC 4406 NGC 5882 Galaxies IC 4444 NGC 5530 NGC 5643 Astronomical events SN 1006 Category

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