# Omicron Lupi

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Binary star system in the constellation Lupus

Omicron Lupi Location of ο Lupi (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus Right ascension 14h 51m 38.30289s[1] Declination −43° 34′ 31.2965″[1] Apparent magnitude (V) 4.323[2] (4.84 + 5.27)[3] Characteristics Spectral type B5 IV[3] U−B color index −0.620[2] B−V color index −0.159[2] Astrometry Radial velocity (Rv) +7.30±0.74[4] km/s Proper motion (μ) RA: −25.20[1] mas/yr Dec.: −27.13[1] mas/yr Parallax (π) 8.07±0.59 mas[1] Distance 400 ± 30 ly (124 ± 9 pc) Absolute magnitude (MV) −1.2±0.3[5] Details Mass 5.7±0.2[5] M☉ Radius 3.5[5] R☉ Luminosity 1,260[5] L☉ Surface gravity (log g) 4.1±0.1[5] cgs Temperature 18,000[6] K Rotational velocity (v sin i) 25[6] km/s Other designations ο Lup, CD−43°9391, HD 130807, HIP 72683, HR 5528, SAO 225248[7] Database references SIMBAD data

**Omicron Lupi** (**ο Lup**) is a [binary star](/source/Binary_star)[3] in the [southern](/source/Southern_celestial_hemisphere) [constellation](/source/Constellation) of [Lupus](/source/Lupus_(constellation)). It is a visible to the naked eye with a combined [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.323.[2] Based upon an annual [parallax shift](/source/Stellar_parallax) of 8.07 [mas](/source/Milliarcsecond) as seen from Earth,[1] it is located around 400 [light-years](/source/Light-year) from the [Sun](/source/Sun), give or take 30 light-years. At that distance, the visual magnitude of the system is diminished by an [extinction factor](/source/Extinction_(astronomy)) of 0.13±0.01 due to [interstellar dust](/source/Interstellar_dust).[5] It is a member of the Upper Centaurus–Lupus[8] subgroup of the nearby [Scorpius–Centaurus association](/source/Scorpius%E2%80%93Centaurus_association).[6]

This is a [visual binary](/source/Visual_binary) star system with the components having an [angular separation](/source/Angular_separation) of 0.1 [arcsecond](/source/Arcsecond).[8] The primary, component A, is a magnitude 4.84 [B-type](/source/B-type_star) [subgiant](/source/Subgiant) star with a [stellar classification](/source/Stellar_classification) of B5 V.[3] It displays [radial velocity](/source/Radial_velocity) variations indicating it has an unseen second companion orbiting at a separation of at least 17 [AU](/source/Astronomical_unit) with a period of 27 years or more.[6] The spectrum of the primary displays a [Zeeman effect](/source/Zeeman_effect) indicating a [magnetic field](/source/Stellar_magnetic_field) with a strength ranging from −94 to 677 [G](/source/Gauss_(unit)).[6] The visible companion, component B, has a visual magnitude of 5.27.[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-Cousins1973_2-0) [***b***](#cite_ref-Cousins1973_2-1) [***c***](#cite_ref-Cousins1973_2-2) [***d***](#cite_ref-Cousins1973_2-3) Cousins, A. W. J. (1973), "Revised zero points and UBV photometry of stars in the Harvard E and F regions", *Memoirs of the Royal Astronomical Society*, **77**: 223–236, [Bibcode](/source/Bibcode_(identifier)):[1973MmRAS..77..223C](https://ui.adsabs.harvard.edu/abs/1973MmRAS..77..223C).

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) 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-deBruijne2012_4-0)** 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-Petit2013_5-0) [***b***](#cite_ref-Petit2013_5-1) [***c***](#cite_ref-Petit2013_5-2) [***d***](#cite_ref-Petit2013_5-3) [***e***](#cite_ref-Petit2013_5-4) [***f***](#cite_ref-Petit2013_5-5) Petit, V.; et al. (February 2013), ["A magnetic confinement versus rotation classification of massive-star magnetospheres"](https://pure.uva.nl/ws/files/1746728/147519_A_magnetic_confinement.pdf) (PDF), *Monthly Notices of the Royal Astronomical Society*, **429** (1): 398–422, [arXiv](/source/ArXiv_(identifier)):[1211.0282](https://arxiv.org/abs/1211.0282), [Bibcode](/source/Bibcode_(identifier)):[2013MNRAS.429..398P](https://ui.adsabs.harvard.edu/abs/2013MNRAS.429..398P), [doi](/source/Doi_(identifier)):[10.1093/mnras/sts344](https://doi.org/10.1093%2Fmnras%2Fsts344).

1. ^ [***a***](#cite_ref-Alecian2011_6-0) [***b***](#cite_ref-Alecian2011_6-1) [***c***](#cite_ref-Alecian2011_6-2) [***d***](#cite_ref-Alecian2011_6-3) [***e***](#cite_ref-Alecian2011_6-4) Alecian, E.; et al. (December 2011), "First HARPSpol discoveries of magnetic fields in massive stars", *Astronomy & Astrophysics*, **536**: 4, [arXiv](/source/ArXiv_(identifier)):[1111.3433](https://arxiv.org/abs/1111.3433), [Bibcode](/source/Bibcode_(identifier)):[2011A&A...536L...6A](https://ui.adsabs.harvard.edu/abs/2011A&A...536L...6A), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201118354](https://doi.org/10.1051%2F0004-6361%2F201118354), [S2CID](/source/S2CID_(identifier)) [51173988](https://api.semanticscholar.org/CorpusID:51173988), L6.

1. **[^](#cite_ref-SIMBAD_7-0)** ["omi Lup"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=omi+Lup). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-03-10.

1. ^ [***a***](#cite_ref-Chen2012_8-0) [***b***](#cite_ref-Chen2012_8-1) Chen, Christine H.; et al. (September 2012), "A Spitzer MIPS Study of 2.5–2.0 M☉ Stars in Scorpius–Centaurus", *The Astrophysical Journal*, **756** (2): 24, [arXiv](/source/ArXiv_(identifier)):[1207.3415](https://arxiv.org/abs/1207.3415), [Bibcode](/source/Bibcode_(identifier)):[2012ApJ...756..133C](https://ui.adsabs.harvard.edu/abs/2012ApJ...756..133C), [doi](/source/Doi_(identifier)):[10.1088/0004-637X/756/2/133](https://doi.org/10.1088%2F0004-637X%2F756%2F2%2F133), [S2CID](/source/S2CID_(identifier)) [119278056](https://api.semanticscholar.org/CorpusID:119278056), 133.

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 [Omicron Lupi](https://en.wikipedia.org/wiki/Omicron_Lupi) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Omicron_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.