{{Short description|Star in the constellation Lupus}} {{about-distinguish|i Lupi (1 Lupi)|iota Lupi{{!}}ι (iota) Lupi}} {{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=1 Lupi |x=528|y=295 }} | caption = Location of 1 Lupi (circled in red) }} {{Starbox observe | epoch = J2000.0 | constell = [[Lupus (constellation)|Lupus]] | ra = {{RA|15|14|37.32104}}<ref name=GaiaDR2/> | dec = {{DEC|-31|31|08.8434}}<ref name=GaiaDR2/> | appmag_v = 4.90<ref name="MERMILLIOD"/> }} {{Starbox character | class = F1 III<ref name="Houk1978"/> or F0 Ib-II<ref name=Gray2001/> | b-v = 0.37<ref name="AmmlerVonEiff2012"/> | u-b = +0.26<ref name="MERMILLIOD"/> | variable = }} {{Starbox astrometry | radial_v = −22.80<ref name="Gontcharov"/> | prop_mo_ra = −9.873<ref name=GaiaDR2/> | prop_mo_dec = –0.892<ref name=GaiaDR2/> | parallax = 1.8055 | p_error = 0.1876 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = −3.93<ref name=Anderson2012/> }} {{Starbox detail | mass = {{Val|6.9|0.1}}<ref name=mnras410_1_190/> | radius = {{Val|41.3|2.2|1.7}}<ref name=GaiaDR2/> | luminosity = 2,900<ref name=Mcdonald2012/> | gravity = | temperature = 6,867<ref name="Gontcharov"/> | metal_fe = | rotational_velocity = {{Val|3.9|0.2}}<ref name="AmmlerVonEiff2012"/> | age_myr = {{Val|47.1|3.8}}<ref name=mnras410_1_190/> }} {{Starbox catalog | names = {{odlist | B=i Lup | F=1 Lup | CD=−31°11813 | HD=135153 | HIP=74604 | HR=5660 | SAO=206445 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = 1+Lup }} {{Starbox end}} '''1 Lupi''' is a solitary<ref name=mnras389_2_869/> [[giant star]] in the [[Southern celestial hemisphere|southern]] [[constellation]] of [[Lupus (constellation)|Lupus]]. It has the [[Bayer designation]] '''i Lupi'''; ''1 Lupi'' is the [[Flamsteed designation]]. The [[apparent visual magnitude]] is 4.90,<ref name="MERMILLIOD"/> which indicates it is faintly visible to the naked eye. Based on [[Stellar parallax|parallax]] measurements, this star is approximately 1,800 [[light-year]]s from the [[Sun]].<ref name=GaiaDR2/> It is moving closer to the Earth with a heliocentric [[radial velocity]] of −23 km/s.<ref name="Gontcharov"/>
Houk (1978) assigned the [[spectral classification]] of this star as F1III,<ref name="Houk1978"/> which suggests it is an [[F-type star|F-type]] (yellow-white) star that has evolved away from the [[main sequence]] and expanded into a [[giant star|giant]]. However, Gray et al. (2001) found a class of F0 Ib-II,<ref name=Gray2001/> matching a [[supergiant]]/[[bright giant]] star. It has a mass around seven times [[solar mass|that of the Sun]]<ref name=mnras410_1_190/> and has expanded to 41<ref name=GaiaDR2/> times the [[Sun's radius]]. The star is radiating 2,900<ref name=Mcdonald2012/> times the [[luminosity of the Sun]] from its enlarged [[photosphere]] at an [[effective temperature]] of {{val|6867|fmt=commas|ul=K}}.<ref name="Gontcharov"/> The estimated age of the star is around 47 million years.<ref name=mnras410_1_190/>
== References == <references>
<ref name=GaiaDR2>{{cite DR2|6210657748086115328}}</ref>
<ref name=Gray2001>{{citation | display-authors=1 | last1=Gray | first1=R. O. | last2=Napier | first2=M. G. | last3=Winkler | first3=L. I. | title=The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars | journal=The Astronomical Journal | volume=121 | issue=4 | pages=2148–2158 | date=April 2001 | doi=10.1086/319956 | bibcode=2001AJ....121.2148G | postscript=. | doi-access=free }}</ref>
<ref name=SIMBAD>{{citation | title=i Lup -- Star | work=SIMBAD Astronomical Database | publisher=[[Centre de Données astronomiques de Strasbourg]] | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=1+Lupi | accessdate=2016-03-07 | postscript=. }}</ref>
<ref name="Houk1978">{{citation | last1=Houk | first1=N. | title=Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars | volume=2 | date=1978 | publisher=Dept. of Astronomy, University of Michigan | bibcode=1978mcts.book.....H | postscript=. }}</ref>
<ref name="Gontcharov">{{citation | last1=Gontcharov | first1=G. A. | title=Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system | journal=Astronomy Letters | volume=32| issue=11| pages=759–771| date=November 2006 | doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G | postscript=. |arxiv = 1606.08053 | s2cid=119231169 }}</ref>
<ref name="AmmlerVonEiff2012">{{citation | last1=Ammler-von Eiff | first1=Matthias | last2=Reiners | first2=Ansgar | title=New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars? | journal=Astronomy & Astrophysics | arxiv=1204.2459 | volume=542 | page=A116 | date=June 2012 | postscript=. | doi=10.1051/0004-6361/201118724 | bibcode=2012A&A...542A.116A | s2cid=53666672 }}</ref>
<ref name="MERMILLIOD">{{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=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=mnras410_1_190>{{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=mnras389_2_869>{{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=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>
</references>
{{Stars of Lupus}}
[[Category:F-type giants]] [[Category:Lupus (constellation)]] [[Category:Bayer objects|Lupi, i]] [[Category:Flamsteed objects|Lupi, 1]] [[Category:Durchmusterung objects|CD-31 11813]] [[Category:Henry Draper Catalogue objects|135153]] [[Category:Hipparcos objects|074604]] [[Category:Bright Star Catalogue objects|5660]]