{{Short description|Star in the constellation Lupus}} {{DISPLAYTITLE:Phi<sup>1</sup> Lupi}} {{other stars by Bayer designation|Phi Lupi{{!}}φ Lupi}} {{Starbox begin | name = φ<sup>1</sup> Lupi }} {{Starbox image | image= {{Location mark |image=Lupus constellation map.svg|alt=|float=center|width=240 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=φ<sup>1</sup> Lupi |x=468|y=484 }} |caption=Location of φ<sup>1</sup> Lupi (circled) }} {{Starbox observe | epoch = [[J2000.0]] | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Lupus (constellation)|Lupus]]<ref name=constellation/> | ra = {{RA|15|21|48.36967}}<ref name=vanLeeuwen2007/> | dec = {{DEC|−36|15|40.9525}}<ref name=vanLeeuwen2007/> | appmag_v = 3.58<ref name=Mermilliod1986/> }} {{Starbox character | class = K5 III<ref name=houk1979/> | b-v = {{Val|+1.534|0.005}}<ref name=Anderson2012/> | u-b = +1.85<ref name=Mermilliod1986/> | r-i = | variable = }} {{Starbox astrometry | radial_v = {{Val|−29.4|0.7}}<ref name=deBruijne2012/> | prop_mo_ra = −92.33<ref name=vanLeeuwen2007/> | prop_mo_dec = −85.67<ref name=vanLeeuwen2007/> | parallax = 11.86 | p_error = 0.16 | parallax_footnote = <ref name=vanLeeuwen2007/> | absmag_v = −1.55<ref name=Ginestet2000/> }} {{Starbox detail | source = | mass = 1.78<ref name=charbonnel2020/> | radius = 40<ref name=dr2/> | luminosity = 1,413<ref name=charbonnel2020/> | temperature = 3,800<ref name=charbonnel2020/> | gravity = 1.93<ref name=cardiel2021/> | metal_fe = −0.40<ref name=charbonnel2020/> | rotational_velocity = | age_myr = }} {{Starbox catalog | names = {{odlist | B=φ<sup>1</sup> Lup | CD=−35°10236 | FK5=566 | HD=136422 | HIP=75177 | HR=5705 | SAO=206552 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = phi01+Lup }} {{Starbox end}}
[[Image:phi1LupLightCurve.png|thumb|left|A [[light curve]] for Phi<sup>1</sup> Lupi, plotted from ''[[Hipparcos]]'' data<ref name="CDS"/>]] '''Phi<sup>1</sup> Lupi''' is a solitary<ref name=Eggleton2008/> [[star]] in the southern [[constellation]] of [[Lupus (constellation)|Lupus]]. It is visible to the naked eye with an [[apparent visual magnitude]] of 3.58.<ref name=Mermilliod1986/> Based upon an annual [[stellar parallax|parallax shift]] of 11.86 [[milliarcsecond|mas]] as seen from Earth, it is located around 275 [[light year]]s from the [[Sun]]. The star is drifting closer with a [[radial velocity]] of −29 km/s.<ref name=deBruijne2012/> It has an [[absolute magnitude]] of −1.55.<ref name=Ginestet2000/>
This is an [[stellar evolution|evolved]] [[K-type star|K-type]] [[giant star]] with a [[stellar classification]] of K5 III,<ref name=houk1979/> which means it has used up its core [[hydrogen]] and has expanded. At present it has 40 times the [[radius of the Sun]].<ref name=dr2/> It is a [[variable star]] of unknown type, with an [[amplitude]] of 0.008 in visual magnitude and a period of 4.82 days.<ref name=Koen2002/> The star is radiating 1,413 times the [[luminosity of the Sun]] from its enlarged [[photosphere]] at an [[effective temperature]] of {{val|fmt=commas|3,800|ul=K}}.<ref name=charbonnel2020/> {{clear left}} ==References== <references>
<ref name=dr2>{{cite DR2|6007749027571497472}}</ref>
<ref name=constellation>{{cite constellation|HR 5705}}</ref>
<ref name="CDS">{{cite web | url=https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats | website=Centre de Données astronomiques de Strasbourg | title=/ftp/cats/more/HIP/cdroms/cats | publisher=Strasbourg astronomical Data Center |access-date=15 October 2022}}</ref>
<ref name=charbonnel2020>{{cite journal |bibcode=2020A&A...633A..34C |title=Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era |last1=Charbonnel |first1=C. |last2=Lagarde |first2=N. |last3=Jasniewicz |first3=G. |last4=North |first4=P. L. |last5=Shetrone |first5=M. |last6=Krugler Hollek |first6=J. |last7=Smith |first7=V. V. |last8=Smiljanic |first8=R. |last9=Palacios |first9=A. |last10=Ottoni |first10=G. |journal=Astronomy and Astrophysics |date=2020 |volume=633 |pages=A34 |doi=10.1051/0004-6361/201936360 |arxiv=1910.12732 }}</ref>
<ref name=cardiel2021>{{cite journal |bibcode=2002A&A...393..183B |title=A catalogue of calibrator stars for long baseline stellar interferometry |last1=Bordé |first1=P. |last2=Coudé Du Foresto |first2=V. |last3=Chagnon |first3=G. |last4=Perrin |first4=G. |journal=Astronomy and Astrophysics |date=2002 |volume=393 |page=183 |doi=10.1051/0004-6361:20021020 }}</ref>
<ref name=Anderson2012>{{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | postscript=. | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | arxiv=1108.4971 | doi=10.1134/S1063773712050015 | s2cid=119257644 }}</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=Ginestet2000>{{citation | title=Magnitudes absolues des étoiles standards MK des types G à M à partir des parallaxes Hipparcos | trans-title=The absolute magnitudes of the G to M type MK standards from the Hipparcos parallaxes | display-authors=1 | last1=Ginestet | first1=N. | last2=Carquillat | first2=J. M. | last3=Jaschek | first3=C. | journal=Astronomy and Astrophysics Supplement | postscript=. | volume=142 | pages=13–24 | date=February 2000 | language=French | doi=10.1051/aas:2000135 | bibcode=2000A&AS..142...13G | doi-access=free }}</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=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=houk1979>{{citation | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=3 | last1=Houk | first1=Nancy | postscript=. | publication-place=Ann Arbor, Michigan | publisher=Dept. of Astronomy, University of Michigan | date=1979 | bibcode=1982mcts.book.....H }}</ref>
<ref name=Koen2002>{{citation | last1=Koen | first1=Chris | last2=Eyer | first2=Laurent | title=New periodic variables from the Hipparcos epoch photometry | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=331 | issue=1 | pages=45–59 |date=March 2002 | doi=10.1046/j.1365-8711.2002.05150.x | doi-access=free | bibcode=2002MNRAS.331...45K | arxiv=astro-ph/0112194 | s2cid=10505995 | postscript=. }}</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=SIMBAD>{{cite simbad | title=* phi01 Lup | access-date=2017-03-10 | postscript=. }}</ref>
</references>
{{Stars of Lupus|state=collapsed}}
[[Category:K-type giants]] [[Category:Suspected variables]] [[Category:Zeta Herculis Moving Group]] [[Category:Lupus (constellation)]] [[Category:Bayer objects|Lupi, Phi1]] [[Category:Henry Draper Catalogue objects|136422]] [[Category:Hipparcos objects|075177]] [[Category:Bright Star Catalogue objects|5705]] [[Category:Durchmusterung objects]]