# Mu Lupi

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Multiple star system in the constellation of Lupus

Mu Lupi Location of μ Lupi (circled in red) Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) Constellation Lupus Right ascension 15h 18m 32.02296s[1] Declination −47° 52′ 30.9957″[1] Apparent magnitude (V) 4.29[2] Characteristics Spectral type B8 Ve (AB) + A2/3(V) (C)[3] U−B color index −0.41[2] B−V color index −0.03[2] Astrometry Radial velocity (Rv) +14.90±1.78[4] km/s Proper motion (μ) RA: −29.59[1] mas/yr Dec.: −35.07[1] mas/yr Parallax (π) 9.72±0.71 mas[1] Distance 340 ± 20 ly (103 ± 8 pc) Absolute magnitude (MV) −0.57[5] Orbit[3] Primary A Name B Period (P) 772 yr Semi-major axis (a) 1.657″ Eccentricity (e) 0.43 Inclination (i) 114.6° Periastron epoch (T) 2048 Orbit[6] Primary Ca Name Cb Period (P) 12.353±0.004 days Eccentricity (e) 0.4±0.1 Periastron epoch (T) 2,455,177.7 JD Argument of periastron (ω) (primary) 324±18° Semi-amplitude (K1) (primary) 2.4±0.4 km/s Details[3] A Mass 3.16 M☉ Rotational velocity (v sin i) 280 km/s B Mass 3.07 M☉ Rotational velocity (v sin i) 50 km/s Ca Mass 1.78 M☉ Temperature 8,500[6] K Cb Mass 0.05[6] M☉ Other designations μ Lup, CD−47°9860, FK5 , HD 135734, HIP 74911, HR 5683, SAO 225638, WDS J15185-4753AB[7] Database references SIMBAD data

**Mu Lupi** (**μ Lup**) is a system of three confirmed [stars](/source/Star) and one [brown dwarf](/source/Brown_dwarf)[3] 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 4.29[2] and lies roughly 340 [light-years](/source/Light-year) from the [Sun](/source/Sun).

Two of the components of this system, A and B, form a pair with an [angular separation](/source/Angular_separation) of 1.657 [arcseconds](/source/Arcseconds). An orbital solution gives an orbital period of 772 years. Component C, an [A-type main-sequence star](/source/A-type_main-sequence_star), lies at an angular separation of 23.3 arcseconds from the AB pair,[3] and is itself a binary with an orbital period of 12.35 days. Its companion has a mass of 0.05 M☉, too low to [fuse hydrogen](/source/Hydrogen_burning_limit), and thus it is considered a [brown dwarf](/source/Brown_dwarf).[6] A fifth component, not confirmed to be a physical companion, lies at an angular separation of 6.10 arcseconds from component AB, and with a mass of 0.05 M☉ is also a brown dwarf.[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) 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-Tokovinin2018_3-0) [***b***](#cite_ref-Tokovinin2018_3-1) [***c***](#cite_ref-Tokovinin2018_3-2) [***d***](#cite_ref-Tokovinin2018_3-3) [***e***](#cite_ref-Tokovinin2018_3-4) [***f***](#cite_ref-Tokovinin2018_3-5) Tokovinin, Andrei (2018-03-01), "The Updated Multiple Star Catalog", *The Astrophysical Journal Supplement Series*, **235** (1): 6, [arXiv](/source/ArXiv_(identifier)):[1712.04750](https://arxiv.org/abs/1712.04750), [Bibcode](/source/Bibcode_(identifier)):[2018ApJS..235....6T](https://ui.adsabs.harvard.edu/abs/2018ApJS..235....6T), [doi](/source/Doi_(identifier)):[10.3847/1538-4365/aaa1a5](https://doi.org/10.3847%2F1538-4365%2Faaa1a5), [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049). [Mu Lupi's database entry](https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJS/235/6&ID=15185-4753) at [VizieR](/source/VizieR).

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. **[^](#cite_ref-Hubrig2001_5-0)** Hubrig, S.; et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", *Astronomy and Astrophysics*, **372**: 152–164, [arXiv](/source/ArXiv_(identifier)):[astro-ph/0103201](https://arxiv.org/abs/astro-ph/0103201), [Bibcode](/source/Bibcode_(identifier)):[2001A&A...372..152H](https://ui.adsabs.harvard.edu/abs/2001A&A...372..152H), [doi](/source/Doi_(identifier)):[10.1051/0004-6361:20010452](https://doi.org/10.1051%2F0004-6361%3A20010452), [S2CID](/source/S2CID_(identifier)) [17507782](https://api.semanticscholar.org/CorpusID:17507782).

1. ^ [***a***](#cite_ref-Veramendi2014_6-0) [***b***](#cite_ref-Veramendi2014_6-1) [***c***](#cite_ref-Veramendi2014_6-2) [***d***](#cite_ref-Veramendi2014_6-3) Veramendi, M. E.; González, J. F. (July 2014), "Spectroscopic study of early-type multiple stellar systems. II. New binary subsystems", *Astronomy & Astrophysics*, **567**: 10, [arXiv](/source/ArXiv_(identifier)):[1405.1084](https://arxiv.org/abs/1405.1084), [Bibcode](/source/Bibcode_(identifier)):[2014A&A...567A..35V](https://ui.adsabs.harvard.edu/abs/2014A&A...567A..35V), [doi](/source/Doi_(identifier)):[10.1051/0004-6361/201423736](https://doi.org/10.1051%2F0004-6361%2F201423736), [S2CID](/source/S2CID_(identifier)) [21711755](https://api.semanticscholar.org/CorpusID:21711755), A35.

1. **[^](#cite_ref-SIMBAD_7-0)** ["* mu. Lup -- Be Star"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+mu.+Lup+--+Be+Star). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg). Retrieved 2017-03-08.{{[cite web](https://en.wikipedia.org/wiki/Template:Cite_web)}}: CS1 maint: postscript ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_postscript))

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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