{{short description|Multiple star system in the constellation of Lupus}} {{Starbox begin}} {{Starbox image | image = {{Location mark |image=Lupus constellation map.svg|alt=|float=center|width=250 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=μ Lupi |x=495|y=940 }} | caption = Location of μ Lupi (circled in red) }} {{Starbox observe | epoch = [[J2000.0]] | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Lupus (constellation)|Lupus]] | ra = {{RA|15|18|32.02296}}<ref name=vanLeeuwen2007/> | dec = {{DEC|−47|52|30.9957}}<ref name=vanLeeuwen2007/> | appmag_v = 4.29<ref name=Mermilliod1986/> }} {{Starbox character | class = B8 Ve (AB) + A2/3(V) (C)<ref name=Tokovinin2018/> | b-v = −0.03<ref name=Mermilliod1986/> | u-b = −0.41<ref name=Mermilliod1986/> | r-i = | variable = }} {{Starbox astrometry | radial_v = {{Val|+14.90|1.78}}<ref name=deBruijne2012/> | prop_mo_ra = −29.59<ref name=vanLeeuwen2007/> | prop_mo_dec = −35.07<ref name=vanLeeuwen2007/> | parallax = 9.72 | p_error = 0.71 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = −0.57<ref name=Hubrig2001/> }} {{Starbox orbit | reference = <ref name=Tokovinin2018/> | primary = A | name = B | period = 772 | axis = 1.657 | eccentricity = 0.43 | inclination = 114.6 | periastron = 2048 }} {{Starbox orbit | reference = <ref name=Veramendi2014/> | primary = Ca | name = Cb | period_unitless = {{val|12.353|0.004}} days | eccentricity = {{Val|0.4|0.1}} | periastron = 2,455,177.7 [[Julian day|JD]] | k1 = {{Val|2.4|0.4}} | periarg_primary = {{Val|324|18}} }} {{Starbox detail | source = <ref name=Tokovinin2018/> | component1 = A | mass = 3.16 | rotational_velocity = 280 | component2 = B | mass2 = 3.07 | rotational_velocity2 = 50 }} {{Starbox detail|no_heading=y | component1 = Ca | mass = 1.78 | temperature = 8,500<ref name=Veramendi2014/> | component2 = Cb | mass2 = 0.05<ref name=Veramendi2014/> }} {{Starbox catalog | names = [[Bayer designation|μ Lup]], [[Durchmusterung|CD]]−47°9860, [[FK5]] , [[Henry Draper Catalogue|HD]] 135734, [[Hipparcos Catalogue|HIP]] 74911, [[Bright Star Catalogue|HR]] 5683, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 225638, [[Washington Double Star Catalog|WDS]] J15185-4753AB<ref name=SIMBAD/> }} {{Starbox reference | Simbad = mu+Lup }} {{Starbox end}} '''Mu Lupi''' ('''μ Lup''') is a system of three confirmed [[star]]s and one [[brown dwarf]]<ref name=Tokovinin2018/> in the [[Southern celestial hemisphere|southern]] [[constellation]] of [[Lupus (constellation)|Lupus]]. It is visible to the naked eye with an [[apparent visual magnitude]] of 4.29<ref name=Mermilliod1986/> and lies roughly 340 [[light-year]]s from the [[Sun]].
Two of the components of this system, A and B, form a pair with an [[angular separation]] of 1.657 [[arcseconds]]. An orbital solution gives an orbital period of 772 years. Component C, an [[A-type main-sequence star]], lies at an angular separation of 23.3 arcseconds from the AB pair,<ref name=Tokovinin2018/> and is itself a binary with an orbital period of 12.35 days. Its companion has a mass of {{solar mass|0.05}}, too low to [[hydrogen burning limit|fuse hydrogen]], and thus it is considered a [[brown dwarf]].<ref name=Veramendi2014/> 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 {{solar mass|0.05}} is also a brown dwarf.<ref name=Tokovinin2018/>
==References== <references>
<ref name=vanLeeuwen2007>{{citation | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}</ref>
<ref name=Hubrig2001>{{citation | title=Search for low-mass PMS companions around X-ray selected late B stars | last1=Hubrig | first1=S. | last2=Le Mignant | first2=D. | last3=North | first3=P. | last4=Krautter | first4=J. | journal=Astronomy and Astrophysics | display-authors=1 | volume=372 | pages=152–164 | date=June 2001 | doi=10.1051/0004-6361:20010452 | bibcode=2001A&A...372..152H | arxiv=astro-ph/0103201 | s2cid=17507782 | postscript=. }}</ref>
<ref name=Veramendi2014>{{citation | title=Spectroscopic study of early-type multiple stellar systems. II. New binary subsystems | last1=Veramendi | first1=M. E. | last2=González | first2=J. F. | journal=Astronomy & Astrophysics | volume=567 | id=A35 | pages=10 | date=July 2014 | doi=10.1051/0004-6361/201423736 | bibcode=2014A&A...567A..35V | postscript=. |arxiv = 1405.1084 | s2cid=21711755 }}</ref>
<ref name=Tokovinin2018>{{ciation |last=Tokovinin |first=Andrei |date=2018-03-01 |title=The Updated Multiple Star Catalog |bibcode=2018ApJS..235....6T |journal=The Astrophysical Journal Supplement Series |volume=235 |issue=1 |pages=6 |doi=10.3847/1538-4365/aaa1a5 |doi-access=free |arxiv=1712.04750 |issn=0067-0049}}. [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJS/235/6&ID=15185-4753 Mu Lupi's database entry] at [[VizieR]].</ref>
<ref name=Mermilliod1986>{{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | journal=Catalogue of Eggen's UBV Data | year=1986 | publisher=[[SIMBAD]] | bibcode=1986EgUBV........0M | postscript=. }}</ref>
<ref name=deBruijne2012>{{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | s2cid=59451347 | postscript=. }}</ref>
<ref name=SIMBAD>{{cite simbad | title=* mu. Lup -- Be Star | access-date=2017-03-08 | postscript=. }}</ref>
</references>
{{Stars of Lupus|state=collapsed}}
[[Category:B-type main-sequence stars]] [[Category:Lupus (constellation)]] [[Category:Bayer objects|Lupi, Mu]] [[Category:Durchmusterung objects|CD-47 09860]] [[Category:Henry Draper Catalogue objects|135734]] [[Category:Hipparcos objects|74911]] [[Category:Bright Star Catalogue objects|5683]]