Phi2 Lupi

{{Short description|Star in the constellation Lupus}} {{DISPLAYTITLE:Phi2 Lupi}} {{other stars by Bayer designation|Phi Lupi{{!}}φ Lupi}} {{Starbox begin | name = Phi2 Lupi }} {{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=Phi2 Lupi |x=455|y=508 }} | caption = Location of φ2 Lupi (circled in red) }} {{Starbox observe | epoch = [[J2000.0]] | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Lupus (constellation)|Lupus]] | ra = {{RA|15|23|09.35005}}<ref name=vanLeeuwen2007/> | dec = {{DEC|−36|51|30.5521}}<ref name=vanLeeuwen2007/> | appmag_v = 4.535<ref name=Kozok1985/> }} {{Starbox character | class = B4 V<ref name=Braganca2012/><ref name=Tetzlaff2011/> | b-v = −0.161<ref name=Kozok1985/> | u-b = −0.648<ref name=Kozok1985/> | r-i = | variable = }} {{Starbox astrometry | radial_v = {{Val|+0.80|2.70}}<ref name=deBruijne2012/> | prop_mo_ra = −18.24<ref name=vanLeeuwen2007/> | prop_mo_dec = −20.72<ref name=vanLeeuwen2007/> | parallax = 6.28 | p_error = 0.20 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = −1.47<ref name=Anderson2012/> }} {{Starbox detail | source = | mass = {{Val|6.1|0.1}}<ref name=Tetzlaff2011/> | radius = 3.4<ref name=PasinettiFracassini2001/> | luminosity = 800<ref name=Mcdonald2012/> | temperature = 16,780<ref name=Braganca2012/> | gravity = | metal_fe = | rotational_velocity = {{Val|141|6}}<ref name=Braganca2012/> | age_myr = {{Val|39.9|10.1}}<ref name=Tetzlaff2011/> }} {{Starbox catalog | names = [[Bayer designation|φ2 Lup]], [[Durchmusterung|CD]]−36°10103, [[FK5]] 1403, [[Henry Draper Catalogue|HD]] 136664, [[Hipparcos Catalogue|HIP]] 75304, [[Harvard Revised catalogue|HR]] 5712, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 206580<ref name=SIMBAD/> }} {{Starbox reference | Simbad = phi2+Lup }} {{Starbox end}} '''Phi2 Lupi''', [[Latinisation of names|Latinized]] from '''φ2 Lupi''', is a solitary<ref name=Eggleton2008/> [[star]] in the southern [[constellation]] of [[Lupus (constellation)|Lupus]]. With an [[apparent magnitude]] of 4.535,<ref name=Kozok1985/> it is bright enough to be seen with the naked eye. Based upon an annual [[stellar parallax|parallax shift]] of 6.28 [[milliarcsecond|mas]] as seen from Earth, it is located around 520 [[light year]]s from the [[Sun]]. At that distance, the visual magnitude of the star is diminished by an [[extinction (astronomy)|extinction factor]] of {{Val|0.052|0.013}} due to [[interstellar dust]]. It is a member of the Upper Centaurus–Lupus subgroup of the [[Scorpius–Centaurus association]].<ref name=Chen2012/>

This is an ordinary [[B-type main sequence star]] with a [[stellar classification]] of B4 V.<ref name=Braganca2012/><ref name=Tetzlaff2011/> It has an estimated 6.1<ref name=Tetzlaff2011/> times the [[solar mass|mass of the Sun]] and about 3.4<ref name=PasinettiFracassini2001/> times the [[solar radius|Sun's radius]]. The star is roughly 40<ref name=Tetzlaff2011/> million years and is spinning with a [[projected rotational velocity]] of 141 km/s.<ref name=Braganca2012/> It is radiating about 800<ref name=Mcdonald2012/> times the [[solar luminosity]] from its [[photosphere]] at an [[effective temperature]] of 16,780 K.<ref name=Braganca2012/>

==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=Chen2012>{{citation | title=A Spitzer MIPS Study of 2.5–2.0 M☉ Stars in Scorpius–Centaurus | display-authors=1 | last1=Chen | first1=Christine H. | last2=Pecaut | first2=Mark | last3=Mamajek | first3=Eric E. | last4=Su | first4=Kate Y. L. | last5=Bitner | first5=Martin | journal=The Astrophysical Journal | volume=756 | issue=2 | id=133 | pages=24 | date=September 2012 | doi=10.1088/0004-637X/756/2/133 | bibcode=2012ApJ...756..133C | arxiv=1207.3415 | s2cid=119278056 | postscript=. }}</ref>

<ref name=PasinettiFracassini2001>{{citation | display-authors=1 | 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) - Third edition - Comments and statistics | journal=Astronomy & Astrophysics | volume=367 | pages=521–24 | date=2001 | issue=2 | bibcode=2001A&A...367..521P | doi=10.1051/0004-6361:20000451 | arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}</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=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=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=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=Braganca2012>{{citation | title=Projected Rotational Velocities and Stellar Characterization of 350 B Stars in the Nearby Galactic Disk | last1=Bragança | first1=G. A. | last2=Daflon | first2=S. | last3=Cunha | first3=K. | last4=Bensby | first4=T. | last5=Oey | first5=M. S. | last6=Walth | first6=G. | journal=The Astronomical Journal | date=November 2012 | volume=144 | issue=5 | id=130 | pages=10 | display-authors=1 | doi=10.1088/0004-6256/144/5/130 | bibcode=2012AJ....144..130B | postscript=. |arxiv = 1208.1674 | s2cid=118868235 }}</ref>

<ref name=Kozok1985>{{citation | last1=Kozok | first1=J. R. | title=Photometric observations of emission B-stars in the southern Milky Way | journal=Astronomy and Astrophysics Supplement Series | volume=61 | pages=387–405 | date=September 1985 | bibcode=1985A&AS...61..387K | postscript=. }}</ref>

<ref name=SIMBAD>{{cite simbad | title=phi02 Lup | accessdate=2017-03-10 | postscript=. }}</ref>

</references>

[[Category:B-type main-sequence stars]] [[Category:Lupus (constellation)]] [[Category:Bayer objects|Lupi, Phi2]] [[Category:Henry Draper Catalogue objects|136664]] [[Category:Hipparcos objects|075304]] [[Category:Bright Star Catalogue objects|5712]] [[Category:Durchmusterung objects|CD-36 10103]] [[Category:Upper Centaurus Lupus]]