{{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=θ Lupi |x=115|y=532 }} | caption = Location of θ Lupi (circled in red) }} {{Starbox observe | epoch = [[J2000.0]] | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Lupus (constellation)|Lupus]] | ra = {{RA|16|06|35.54525}}<ref name=vanLeeuwen2007/> | dec = {{DEC|−36|48|08.2653}}<ref name=vanLeeuwen2007/> | appmag_v = 4.22<ref name=GutierrezMoreno1968/> }} {{Starbox character | class = B2.5 Vn<ref name=Hiltner1969/> | b-v = −0.184<ref name=GutierrezMoreno1968/> | u-b = −0.734<ref name=GutierrezMoreno1968/> | r-i = | variable = }} {{Starbox astrometry | radial_v = {{Val|+6.0|3.4}}<ref name=deBruijne2012/> | prop_mo_ra = −15.33<ref name=vanLeeuwen2007/> | prop_mo_dec = −33.83<ref name=vanLeeuwen2007/> | parallax = 7.87 | p_error = 0.47 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = −1.29<ref name=Anderson2012/> }} {{Starbox detail | source = | mass = {{Val|6.5|0.1}}<ref name=Tetzlaff2011/> | radius = 4.5<ref name=PasinettiFracassini2001/> | luminosity = 792<ref name=Mcdonald2012/> | temperature = 15,395<ref name=Mcdonald2012/> | gravity = 4.5<ref name=Kraus2016/> | metal_fe = | rotational_velocity = 331<ref name=UesugiFukuda70/> | age_myr = {{Val|24.6|5.2}}<ref name=Tetzlaff2011/> }} {{Starbox catalog | names = [[Bayer designation|θ Lup]], [[Durchmusterung|CD]]−36°10642, [[FK5]] 599, [[Henry Draper Catalogue|HD]] 144294, [[Hipparcos Catalogue|HIP]] 78918, [[Harvard Revised catalogue|HR]] 5987, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 207332<ref name=SIMBAD/> }} {{Starbox reference | Simbad = tet+Lup }} {{Starbox end}} '''Theta Lupi''', [[Latinisation of names|Latinized]] from '''θ Lupi''', is a solitary<ref name=Rizzuto2013/> [[star]] in the southern [[constellation]] of [[Lupus (constellation)|Lupus]]. It is visible to the naked eye with an [[apparent visual magnitude]] of 4.22.<ref name=GutierrezMoreno1968/> (The [[planetary nebula]] [[NGC 6072]] lies 1.4° to the east-northeast.<ref name=Bakich2010/>) Based upon an annual [[stellar parallax|parallax shift]] of 7.87 [[milliarcsecond|mas]] as seen from Earth, it is located roughly 410 [[light year]]s away from the [[Sun]]. Relative to its neighbors, this star has a [[peculiar velocity]] of {{Val|16.7|3.7|u=km/s}}.<ref name=Bobylev2013/> It is a member of the nearby [[Sco OB2]] association.<ref name=Rizzuto2013/>
This is a [[B-type main sequence star]] with a [[stellar classification]] of B2.5 Vn,<ref name=Hiltner1969/> where the 'n' suffix indicates nebulous [[absorption line|lines]] due to spin. It is rotating rapidly with a [[projected rotational velocity]] of 331 km/s.<ref name=UesugiFukuda70/> This is giving the star an [[Oblate spheroid|oblate]] shape with an [[equatorial bulge]] that is an estimated 15% larger than the polar radius.<ref name=belle2012/> The star has an estimated 6.5<ref name=Tetzlaff2011/> times the [[solar mass|mass of the Sun]] and around 4.5<ref name=PasinettiFracassini2001/> times the [[solar radius|Sun's radius]]. With an age of just 24.6<ref name=Tetzlaff2011/> million years, it is radiating 792 times the [[solar luminosity]] from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 15,395 K.<ref name=Mcdonald2012/>
==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=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=Rizzuto2013>{{citation | title=Long-baseline interferometric multiplicity survey of the Sco-Cen OB association | display-authors=1 | last1=Rizzuto | first1=A. C. | last2=Ireland | first2=M. J. | last3=Robertson | first3=J. G. | last4=Kok | first4=Y. | last5=Tuthill | first5=P. G. | last6=Warrington | first6=B. A. | last7=Haubois | first7=X. | last8=Tango | first8=W. J. | last9=Norris | first9=B. | last10=ten Brummelaar | first10=T. | last11=Kraus | first11=A. L. | last12=Jacob | first12=A. | last13=Laliberte-Houdeville | first13=C. | journal=Monthly Notices of the Royal Astronomical Society | volume=436 | issue=2 | pages=1694–1707 | date=December 2013 | doi=10.1093/mnras/stt1690 | doi-access=free | bibcode=2013MNRAS.436.1694R | postscript=. |arxiv = 1309.3811 }}</ref>
<ref name=Kraus2016>{{citation | title=The Close Companion Mass-ratio Distribution of Intermediate-mass Stars | display-authors=1 | last1=Gullikson | first1=Kevin | last2=Kraus | first2=Adam | last3=Dodson-Robinson | first3=Sarah | journal=The Astronomical Journal | volume=152 | issue=2 | id=40 | pages=13 | date=August 2016 | doi=10.3847/0004-6256/152/2/40 | bibcode=2016AJ....152...40G | arxiv=1604.06456 | s2cid=119179065 | postscript=. | doi-access=free }}</ref>
<ref name=PasinettiFracassini2001>{{citation | last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A. | title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) | journal=Astronomy and Astrophysics | display-authors=1 | volume=367 | pages=521–524 | date=February 2001 | edition=3rd | doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}</ref>
<ref name=Mcdonald2012>{{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57| date=2012 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | s2cid=118665352 | postscript=. }}</ref>
<ref name=Bakich2010>{{citation | title=1,001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers | series=The Patrick Moore Practical Astronomy Series | first1=Michael E. | last1=Bakich | publisher=Springer Science & Business Media | year=2010 | isbn=978-1441917775 | page=191 | postscript=. | url=https://books.google.com/books?id=qEhpS7d5ZdAC&pg=PA191 }}</ref>
<ref name=belle2012>{{citation | title=Interferometric observations of rapidly rotating stars | last1=Belle | first1=G. T. | journal=The Astronomy and Astrophysics Review | volume=20 | pages=51 | year=2012 | issue=1 | doi=10.1007/s00159-012-0051-2 | bibcode=2012A&ARv..20...51V | arxiv=1204.2572 | s2cid=119273474 | 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=Bobylev2013>{{citation | title=Galactic kinematics from a sample of young massive stars | last1=Bobylev | first1=V. V. | last2=Bajkova | first2=A. T. | journal=Astronomy Letters | postscript=. | volume=39 | issue=8 | pages=532–549 | date=August 2013 | doi=10.1134/S106377371308001X | bibcode=2013AstL...39..532B |arxiv = 1307.1677 | s2cid=118568203 }}</ref>
<ref name=Tetzlaff2011>{{citation | display-authors=1 | last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M. | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun | journal=Monthly Notices of the Royal Astronomical Society | volume=410 | issue=1 | pages=190–200 | date=January 2011 | doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | bibcode=2011MNRAS.410..190T | arxiv=1007.4883 | s2cid=118629873 | postscript=. }}</ref>
<ref name=Hiltner1969>{{citation | display-authors=1 | last1=Hiltner | first1=W. A. | last2=Garrison | first2=R. F. | last3=Schild | first3=R. E. | title=MK Spectral Types for Bright Southern OB Stars | journal=Astrophysical Journal | postscript=. | volume=157 |date=July 1969 | pages=313–326 | doi=10.1086/150069 | bibcode=1969ApJ...157..313H | doi-access=free }}</ref>
<ref name=UesugiFukuda70>{{citation | last1=Uesugi | first1=Akira | last2=Fukuda | first2=Ichiro | title=Catalogue of rotational velocities of the stars | journal=Contributions from the Institute of Astrophysics and Kwasan Observatory | date=1970 | publisher=University of Kyoto | bibcode=1970crvs.book.....U | postscript=. }}</ref>
<ref name=GutierrezMoreno1968>{{citation | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=Hugo | title=A Photometric Investigation of the Scorpio-Centaurus Association | journal=Astrophysical Journal Supplement | volume=15 | page=459 | date=1968 | postscript=. | bibcode=1968ApJS...15..459G | doi=10.1086/190168 | doi-access=free }}</ref>
<ref name=SIMBAD>{{citation | title=tet Lup -- Star | work=SIMBAD Astronomical Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=tet+Lup | accessdate=2017-03-03 | postscript=. }}</ref>
</references>
==External links== *{{citation | first1=James B. | last1=Kaler | date=July 12, 2013 | title=Theta Lupi | work=Stars | publisher=University of Illinois | url=http://stars.astro.illinois.edu/sow/thetalup.html | accessdate=2017-03-05 | postscript=. }}
{{Stars of Lupus|state=collapsed}}
[[Category:B-type main-sequence stars]] [[Category:Lupus (constellation)]] [[Category:Bayer objects|Lupi, Theta]] [[Category:Durchmusterung objects|CD-36 10642]] [[Category:Henry Draper Catalogue objects|144294]] [[Category:Hipparcos objects|078918]] [[Category:Bright Star Catalogue objects|5987]]