# Lambda Lupi

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Triple star system in the constellation Lupus

Lambda Lupi Location of λ Lupi (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus Right ascension 15h 08m 50.61639s[1] Declination −45° 16′ 47.4950″[1] Apparent magnitude (V) 4.04[2] (4.43 + 5.23)[3] Characteristics Spectral type B3 V[4] (B3 V + B3 V)[5] U−B color index −0.67[2] B−V color index −0.18[2] Astrometry Radial velocity (Rv) +9.80±1.78[6] km/s Proper motion (μ) RA: −15.88[1] mas/yr Dec.: −26.80[1] mas/yr Parallax (π) 4.20±0.66 mas[1] Distance approx. 800 ly (approx. 240 pc) Absolute magnitude (MV) −2.75[7] Orbit[8] Period (P) 70.8±0.8 yr Semi-major axis (a) 0.2597±0.0021″ Eccentricity (e) 0.6283±0.0090 Inclination (i) 71.59±0.41° Longitude of the node (Ω) 26.64±0.61° Periastron epoch (T) 1997.907 ± 0.105 Argument of periastron (ω) (secondary) 299.9±1.1° Details λ Lup A Mass 8.14[8] M☉ Rotational velocity (v sin i) 135 km/s Age 28.1±4.1[9] Myr λ Lup B Mass 5.84 M☉ Other designations λ Lup, CD−44°9889, HD 133955, HIP 74117, HR 5626, SAO 225483, WDS J15088-4517AB[10] Database references SIMBAD data

**Lambda Lupi**, [Latinized](/source/Latinisation_of_names) from **λ Lupi**, is a [triple star](/source/Triple_star)[11] system in the southern [constellation](/source/Constellation) of [Lupus](/source/Lupus_(constellation)). It is visible to the naked eye with a combined [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.04.[2] Based upon an annual [parallax shift](/source/Stellar_parallax) of just 4.20[1] [mas](/source/Milliarcsecond) as seen from Earth, it is located roughly 800 [light years](/source/Light_year) from the [Sun](/source/Sun). The system has a [peculiar velocity](/source/Peculiar_velocity) of 27.4±4.9 km/s relative to its neighbors, making it a candidate [runaway star](/source/Runaway_star) system.[9] It is a member of the Upper Centaurus–Lupus sub-group in the [Scorpius–Centaurus OB association](/source/Scorpius%E2%80%93Centaurus_association).[12]

The two visible components of this system orbit each other over a [period](/source/Orbital_period) of 70.8 years with a large [eccentricity](/source/Orbital_eccentricity) of 0.63.[8] The primary component has a visual magnitude of 4.43, while the secondary is of magnitude 5.23.[3] Both are [B-type main sequence stars](/source/B-type_main_sequence_star) with a [stellar classification](/source/Stellar_classification) of B3 V.[5] One of the pair is itself a double-lined [spectroscopic binary](/source/Spectroscopic_binary), making this a triple star system.[11]

## 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-Mermilliod1986_2-0) [***b***](#cite_ref-Mermilliod1986_2-1) [***c***](#cite_ref-Mermilliod1986_2-2) [***d***](#cite_ref-Mermilliod1986_2-3) Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", *Catalogue of Eggen's UBV Data*, [SIMBAD](/source/SIMBAD), [Bibcode](/source/Bibcode_(identifier)):[1986EgUBV........0M](https://ui.adsabs.harvard.edu/abs/1986EgUBV........0M).

1. ^ [***a***](#cite_ref-Eggleton2008_3-0) [***b***](#cite_ref-Eggleton2008_3-1) 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-houk1978_4-0)** Houk, Nancy (1978), *Michigan catalogue of two-dimensional spectral types for the HD stars*, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, [Bibcode](/source/Bibcode_(identifier)):[1978mcts.book.....H](https://ui.adsabs.harvard.edu/abs/1978mcts.book.....H).

1. ^ [***a***](#cite_ref-Edwards1976_5-0) [***b***](#cite_ref-Edwards1976_5-1) Edwards, T. W. (April 1976), "MK classification for visual binary components", *Astronomical Journal*, **81**: 245–249, [Bibcode](/source/Bibcode_(identifier)):[1976AJ.....81..245E](https://ui.adsabs.harvard.edu/abs/1976AJ.....81..245E), [doi](/source/Doi_(identifier)):[10.1086/111879](https://doi.org/10.1086%2F111879). The system is listed in Table II as −44°9889.

1. **[^](#cite_ref-deBruijne2012_6-0)** 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_7-0)** 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-Tokovinin2012_8-0) [***b***](#cite_ref-Tokovinin2012_8-1) [***c***](#cite_ref-Tokovinin2012_8-2) Tokovinin, Andrei (2012), "Speckle Interferometry and Orbits of "Fast" Visual Binaries", *The Astronomical Journal*, **144** (2), 56, [arXiv](/source/ArXiv_(identifier)):[1206.1882](https://arxiv.org/abs/1206.1882), [Bibcode](/source/Bibcode_(identifier)):[2012AJ....144...56T](https://ui.adsabs.harvard.edu/abs/2012AJ....144...56T), [doi](/source/Doi_(identifier)):[10.1088/0004-6256/144/2/56](https://doi.org/10.1088%2F0004-6256%2F144%2F2%2F56), [S2CID](/source/S2CID_(identifier)) [118586009](https://api.semanticscholar.org/CorpusID:118586009).

1. ^ [***a***](#cite_ref-Tetzlaff2011_9-0) [***b***](#cite_ref-Tetzlaff2011_9-1) Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", *[Monthly Notices of the Royal Astronomical Society](/source/Monthly_Notices_of_the_Royal_Astronomical_Society)*, **410** (1): 190–200, [arXiv](/source/ArXiv_(identifier)):[1007.4883](https://arxiv.org/abs/1007.4883), [Bibcode](/source/Bibcode_(identifier)):[2011MNRAS.410..190T](https://ui.adsabs.harvard.edu/abs/2011MNRAS.410..190T), [doi](/source/Doi_(identifier)):[10.1111/j.1365-2966.2010.17434.x](https://doi.org/10.1111%2Fj.1365-2966.2010.17434.x), [S2CID](/source/S2CID_(identifier)) [118629873](https://api.semanticscholar.org/CorpusID:118629873).

1. **[^](#cite_ref-SIMBAD_10-0)** ["* lam Lup"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+lam+Lup). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-03-07.{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: postscript ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_postscript))

1. ^ [***a***](#cite_ref-Mitschelm2004_11-0) [***b***](#cite_ref-Mitschelm2004_11-1) Nitschelm, C. (December 2004), "Discovery and confirmation of some double-lined spectroscopic binaries in the Sco-Cen Complex", in Hilditch, R. W.; Hensberge, H.; Pavlovski, K. (eds.), *In Spectroscopically and Spatially Resolving the Components of the Close Binary Stars, Proceedings of the Workshop held 20-24 October 2003 in Dubrovnik, Croatia*, ASP Conference Series, vol. 318, San Francisco: [Astronomical Society of the Pacific](/source/Astronomical_Society_of_the_Pacific), pp. 291–293, [Bibcode](/source/Bibcode_(identifier)):[2004ASPC..318..291N](https://ui.adsabs.harvard.edu/abs/2004ASPC..318..291N).

1. **[^](#cite_ref-Wolff2007_12-0)** Wolff, S. C.; et al. (2007), "Rotational Velocities for B0-B3 Stars in Seven Young Clusters: Further Study of the Relationship between Rotation Speed and Density in Star-Forming Regions", *[The Astronomical Journal](/source/The_Astronomical_Journal)*, **133** (3): 1092–1103, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0702133](https://arxiv.org/abs/astro-ph/0702133), [Bibcode](/source/Bibcode_(identifier)):[2007AJ....133.1092W](https://ui.adsabs.harvard.edu/abs/2007AJ....133.1092W), [doi](/source/Doi_(identifier)):[10.1086/511002](https://doi.org/10.1086%2F511002), [S2CID](/source/S2CID_(identifier)) [119074863](https://api.semanticscholar.org/CorpusID:119074863).

## External links

- Kaler, James B. (June 20, 2014), ["Lambda Lupi"](http://stars.astro.illinois.edu/sow/lambdalup.html), *Stars*, University of Illinois, retrieved 2017-03-08.

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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