{{Short description|Star in the constellation 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=ω Lupi |x=350|y=735 }} | caption = Location of ω Lupi (circled in red) }} {{Starbox observe | epoch = [[J2000.0]] | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Lupus (constellation)|Lupus]] | ra = {{RA|15|38|03.20372}}<ref name=vanLeeuwen2007/> | dec = {{DEC|−42|34|02.4444}}<ref name=vanLeeuwen2007/> | appmag_v = 4.33<ref name=Johnson1966/> {{nowrap|(4.33 + 11.0)}}<ref name=Eggleton2008/> }} {{Starbox character | class = K4.5 III<ref name=LandiDessy1966/> | b-v = +1.43<ref name=Johnson1966/> | u-b = +1.72<ref name=Johnson1966/> | r-i = | variable = }} {{Starbox astrometry | radial_v = {{Val|−6.8|2.7}}<ref name=deBruijne2012/> | prop_mo_ra = −21.37<ref name=vanLeeuwen2007/> | prop_mo_dec = −29.98<ref name=vanLeeuwen2007/> | parallax = 8.97 | p_error = 0.27 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = +0.21<ref name=Anderson2012/> }} {{Starbox detail | source = | component1 = A | mass = | radius = 22<ref name=dr2a/> | luminosity = 122<ref name=dr2a/> | temperature = 4,087<ref name=dr2a/> | gravity = | metal_fe = | rotational_velocity = | age_myr = | component2 = B | mass2 = | radius2 = 0.8<ref name=dr3b/> | luminosity2 = 0.21<ref name=dr3b/> | temperature2 = 4,480<ref name=dr3b/> | gravity2 = 4.56<ref name=dr3b/> | metal_fe2 = | rotational_velocity2 = | age_myr2 = }} {{Starbox catalog | names = [[Bayer designation|ω Lup]], [[Durchmusterung|CD]]−42°10601, [[FK5]] 3232, [[Henry Draper Catalogue|HD]] 139127, [[Hipparcos Catalogue|HIP]] 76552, [[Harvard Revised catalogue|HR]] 5797, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 226004<ref name=SIMBAD/> }} {{Starbox reference | Simbad = ome+Lup }} {{Starbox end}} '''Omega Lupi''', [[Latinisation of names|Latinised]] from '''ω Lupi''', is a [[double star]] in the [[Southern celestial hemisphere|southern]] [[constellation]] of [[Lupus (constellation)|Lupus]]. It is visible to the naked eye with an [[apparent visual magnitude]] of 4.33,<ref name=Johnson1966/> showing up as a red-hued [[star]] just to the south of [[Gamma Lupi]].<ref name=Arnold1999/> Based upon an annual [[Stellar parallax|parallax shift]] of 8.97<ref name=vanLeeuwen2007/> [[milliarcsecond|mas]] as seen from Earth, it is located around 360 [[light-year]]s from the [[Sun]].
As of 2007, the components of this system had an [[angular separation]] of 11.4 [[arcseconds]] along a [[position angle]] of 29°,<ref name=Mason2014/> and are most likely gravitationally bound as a wide [[binary star]] system.<ref name=Eggleton2008/> The primary component is a magnitude 4.48 [[stellar evolution|evolved]] [[giant star]] with a [[stellar classification]] of K4.5 III.<ref name=LandiDessy1966/> The measured [[angular diameter]], after correction for [[limb darkening]], is {{Val|3.39|0.04|u=[[milliarcsecond|mas]]}}.<ref name=Richichi2005/> At the estimated distance of Omega Lupi, this yields a physical size of about 40 times the [[radius of the Sun]].<ref name=lang2006/> The companion is a magnitude 11.0 star.<ref name=Eggleton2008/>
==References== <references>
<ref name=dr2a>{{cite Gaia DR2|6001701610549676288}}</ref>
<ref name=dr3b>{{cite Gaia DR2|6001701610561013632}}</ref>
<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=Anderson2012>{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | s2cid=119257644 | postscript=. }}</ref>
<ref name=Arnold1999>{{citation | title=The Photographic Atlas of the Stars | postscript=. | display-authors=1 | first1=H.J.P | last1=Arnold | first2=Paul | last2=Doherty | first3=Patrick | last3=Moore | publisher=[[CRC Press]] | year=1999 | isbn=0750306548 | page=176 | url=https://books.google.com/books?id=YjcvJUfnWBAC&pg=PA176 }}</ref>
<ref name=Eggleton2008>{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=389 | issue=2 | pages=869–879 | date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>
<ref name=Mason2014>{{citation | display-authors=1 | last1=Mason | first1=B. D. | last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I. | last4=Douglass | first4=G. G. | last5=Worley | first5=C. E. | title=The Washington Visual Double Star Catalog | journal=The Astronomical Journal | postscript=. | year=2014 | pages=3466–3471 | volume=122 | issue=6 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | doi-access=free }}</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=LandiDessy1966>{{citation | title=Spectral Types on the MK System for Forty-Three Bright Southern Stars, K2-M6 | last1=Landi Dessy | first1=J. | last2=Keenan | first2=P. C. | journal=Astrophysical Journal | postscript=. | volume=146 | pages=587 | date=November 1966 | doi=10.1086/148925 | bibcode=1966ApJ...146..587L | doi-access=free }}</ref>
<ref name=Johnson1966>{{citation | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | page=99 | display-authors=1 | bibcode=1966CoLPL...4...99J | postscript=. }}</ref>
<ref name=Richichi2005>{{citation | display-authors=1 | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | postscript=. | volume=431 | issue=2 | pages=773–777 | date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | doi-access=free }}</ref>
<ref name=lang2006>{{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=[[Birkhäuser]] | date=2006 | isbn=3-540-29692-1 | postscript=. | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }} The radius (R<sub>*</sub>) is given by: :<math>\begin{align} 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{align}</math></ref>
<ref name=SIMBAD>{{cite simbad | title=ome Lup | access-date=2017-03-10 }}</ref>
</references>
{{Stars of Lupus|state=collapsed}}
[[Category:K-type giants]] [[Category:Lupus (constellation)]] [[Category:Bayer objects|Lupi, Omega]] [[Category:Durchmusterung objects|CD-42 10601]] [[Category:Henry Draper Catalogue objects|139127]] [[Category:Hipparcos objects|076552]] [[Category:Bright Star Catalogue objects|5797]] [[Category:Double stars]]