# Omega Lupi

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Star in the constellation Lupus

Omega Lupi Location of ω Lupi (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus Right ascension 15h 38m 03.20372s[1] Declination −42° 34′ 02.4444″[1] Apparent magnitude (V) 4.33[2] (4.33 + 11.0)[3] Characteristics Spectral type K4.5 III[4] U−B color index +1.72[2] B−V color index +1.43[2] Astrometry Radial velocity (Rv) −6.8±2.7[5] km/s Proper motion (μ) RA: −21.37[1] mas/yr Dec.: −29.98[1] mas/yr Parallax (π) 8.97±0.27 mas[1] Distance 360 ± 10 ly (111 ± 3 pc) Absolute magnitude (MV) +0.21[6] Details A Radius 22[7] R☉ Luminosity 122[7] L☉ Temperature 4,087[7] K B Radius 0.8[8] R☉ Luminosity 0.21[8] L☉ Surface gravity (log g) 4.56[8] cgs Temperature 4,480[8] K Other designations ω Lup, CD−42°10601, FK5 3232, HD 139127, HIP 76552, HR 5797, SAO 226004[9] Database references SIMBAD data

**Omega Lupi**, [Latinised](/source/Latinisation_of_names) from **ω Lupi**, is a [double star](/source/Double_star) in the [southern](/source/Southern_celestial_hemisphere) [constellation](/source/Constellation) of [Lupus](/source/Lupus_(constellation)). It is visible to the naked eye with an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.33,[2] showing up as a red-hued [star](/source/Star) just to the south of [Gamma Lupi](/source/Gamma_Lupi).[10] Based upon an annual [parallax shift](/source/Stellar_parallax) of 8.97[1] [mas](/source/Milliarcsecond) as seen from Earth, it is located around 360 [light-years](/source/Light-year) from the [Sun](/source/Sun).

As of 2007, the components of this system had an [angular separation](/source/Angular_separation) of 11.4 [arcseconds](/source/Arcseconds) along a [position angle](/source/Position_angle) of 29°,[11] and are most likely gravitationally bound as a wide [binary star](/source/Binary_star) system.[3] The primary component is a magnitude 4.48 [evolved](/source/Stellar_evolution) [giant star](/source/Giant_star) with a [stellar classification](/source/Stellar_classification) of K4.5 III.[4] The measured [angular diameter](/source/Angular_diameter), after correction for [limb darkening](/source/Limb_darkening), is 3.39±0.04 [mas](/source/Milliarcsecond).[12] At the estimated distance of Omega Lupi, this yields a physical size of about 40 times the [radius of the Sun](/source/Radius_of_the_Sun).[13] The companion is a magnitude 11.0 star.[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-Eggleton2008_3-0) [***b***](#cite_ref-Eggleton2008_3-1) [***c***](#cite_ref-Eggleton2008_3-2) 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. ^ [***a***](#cite_ref-LandiDessy1966_4-0) [***b***](#cite_ref-LandiDessy1966_4-1) Landi Dessy, J.; Keenan, P. C. (November 1966), "Spectral Types on the MK System for Forty-Three Bright Southern Stars, K2-M6", *Astrophysical Journal*, **146**: 587, [Bibcode](/source/Bibcode_(identifier)):[1966ApJ...146..587L](https://ui.adsabs.harvard.edu/abs/1966ApJ...146..587L), [doi](/source/Doi_(identifier)):[10.1086/148925](https://doi.org/10.1086%2F148925).

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-Anderson2012_6-0)** 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-dr2a_7-0) [***b***](#cite_ref-dr2a_7-1) [***c***](#cite_ref-dr2a_7-2) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%206001701610549676288) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-dr3b_8-0) [***b***](#cite_ref-dr3b_8-1) [***c***](#cite_ref-dr3b_8-2) [***d***](#cite_ref-dr3b_8-3) [Brown, A. G. A.](/source/Anthony_Brown_(scientist)); et al. ([Gaia collaboration](/source/Data_Processing_and_Analysis_Consortium)) (August 2018). ["*Gaia* Data Release 2: Summary of the contents and survey properties"](https://doi.org/10.1051%2F0004-6361%2F201833051). *[Astronomy & Astrophysics](/source/Astronomy_%26_Astrophysics)*. **616**. A1. [arXiv](/source/ArXiv_(identifier)):[1804.09365](https://arxiv.org/abs/1804.09365). [Bibcode](/source/Bibcode_(identifier)):[2018A&A...616A...1G](https://ui.adsabs.harvard.edu/abs/2018A&A...616A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201833051](https://doi.org/10.1051%2F0004-6361%2F201833051). [Gaia DR2 record for this source](https://vizier.u-strasbg.fr/viz-bin/VizieR-S?Gaia%20DR2%206001701610561013632) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-SIMBAD_9-0)** ["ome Lup"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ome+Lup). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-03-10.

1. **[^](#cite_ref-Arnold1999_10-0)** Arnold, H.J.P; et al. (1999), [*The Photographic Atlas of the Stars*](https://books.google.com/books?id=YjcvJUfnWBAC&pg=PA176), [CRC Press](/source/CRC_Press), p. 176, [ISBN](/source/ISBN_(identifier)) [0750306548](https://en.wikipedia.org/wiki/Special:BookSources/0750306548).

1. **[^](#cite_ref-Mason2014_11-0)** Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", *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).

1. **[^](#cite_ref-Richichi2005_12-0)** Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", *Astronomy and Astrophysics*, **431** (2): 773–777, [Bibcode](/source/Bibcode_(identifier)):[2005A&A...431..773R](https://ui.adsabs.harvard.edu/abs/2005A&A...431..773R), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20042039](https://doi.org/10.1051%2F0004-6361%3A20042039).

1. **[^](#cite_ref-lang2006_13-0)** Lang, Kenneth R. (2006), [*Astrophysical formulae*](https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41), Astronomy and astrophysics library, vol. 1 (3rd ed.), [Birkhäuser](/source/Birkh%C3%A4user), [ISBN](/source/ISBN_(identifier)) [3-540-29692-1](https://en.wikipedia.org/wiki/Special:BookSources/3-540-29692-1). The radius (R*) is given by: 1. 2 ⋅ R ∗ = ( 111 ⋅ 3.39 ⋅ 10 − 3 ) AU 0.0046491 AU / R ⨀ ≈ 80.9 ⋅ R ⨀ {\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(111\cdot 3.39\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 80.9\cdot R_{\bigodot }\end{aligned}}}

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 [Omega Lupi](https://en.wikipedia.org/wiki/Omega_Lupi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Omega_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.