{{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=HD 125442 |x=895|y=870 }} | caption = Location of HD 125442 (circled in red) }} {{Starbox observe | epoch = J2000 | constell = [[Lupus (constellation)|Lupus]]<ref name=Anderson2012/> | ra = {{RA|14|20|42.58071}}<ref name=GaiaDR2/> | dec = {{DEC|-45|11|13.4190}}<ref name=GaiaDR2/> | appmag_v = 4.78<ref name=Anderson2012/> }} {{Starbox character | class = F0 IV<ref name=houk1978/> | b-v = {{Val|0.310|0.003}}<ref name=Anderson2012/> }} {{Starbox astrometry | radial_v = {{Val|+0.0|3.7}}<ref name=deBruijne2012/> | prop_mo_ra = +37.33<ref name=vanLeeuwen2007/> | prop_mo_dec = −72.81<ref name=vanLeeuwen2007/> | parallax = 22.1448 | p_error = 0.3265 | parallax_footnote = <ref name=GaiaDR2/> | absmag_v = 1.49<ref name=vonEiff2012/> }} {{Starbox detail | source = | mass = 1.58<ref name=tic/> | radius = 2.95<ref name=tic/> | luminosity = 20.2<ref name=tic/> | gravity = 3.97<ref name=tic/> | temperature = 7,123<ref name=tic/> | metal_fe = | rotational_velocity = {{Val|148|10}}<ref name=vonEiff2012/> | age_myr = 614<ref name=David2015/> }} {{Starbox catalog | names={{odlist | CD=-44°9236 | HD=125442 | HIP=70104 | HR=5364 | SAO=224843 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+125442 }} {{Starbox end}}
'''HD 125442''' is a single<ref name=Eggleton2008/> [[star]] in the southern [[constellation]] of [[Lupus (constellation)|Lupus]]. Its [[apparent visual magnitude]] is 4.78,<ref name=Anderson2012/> which can be seen with the naked eye. The distance to HD 125442, as determined from its annual [[stellar parallax|parallax shift]] of {{Val|22.1|ul=mas}},<ref name=GaiaDR2/> is 147 [[light year]]s.
This is an [[F-type star|F-type]] [[subgiant star]] with a [[stellar classification]] of F0 IV,<ref name=houk1978/> having, at the age of 614 million years,<ref name=David2015/> used up the hydrogen at its core and begun the process of [[stellar evolution|evolving]] into a [[giant star]]. It has 1.6 times the [[mass of the Sun]] and is radiating 20 times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of {{val|fmt=commas|7123|ul=K}}.<ref name=tic/> The star displays a high rate of spin with a [[projected rotational velocity]] of 148 km/s.<ref name=vonEiff2012/>
==References== <references>
<ref name=SIMBAD>{{cite simbad | title=HD 125442 | access-date=2018-07-22 }}</ref>
<ref name=GaiaDR2>{{cite DR2}}</ref>
<ref name=tic>{{cite journal |last1=Stassun |first1=Keivan G. |last2=Oelkers |first2=Ryan J. |last3=Paegert |first3=Martin |last4=Torres |first4=Guillermo |last5=Pepper |first5=Joshua |last6=De Lee |first6=Nathan |last7=Collins |first7=Kevin |last8=Latham |first8=David W. |last9=Muirhead |first9=Philip S. |last10=Chittidi |first10=Jay |last11=Rojas-Ayala |first11=Bárbara |last12=Fleming |first12=Scott W. |last13=Rose |first13=Mark E. |last14=Tenenbaum |first14=Peter |last15=Ting |first15=Eric B. |last16=Kane |first16=Stephen R. |last17=Barclay |first17=Thomas |last18=Bean |first18=Jacob L. |last19=Brassuer |first19=C. E. |last20=Charbonneau |first20=David |last21=Ge |first21=Jian |last22=Lissauer |first22=Jack J. |last23=Mann |first23=Andrew W. |last24=McLean |first24=Brian |last25=Mullally |first25=Susan |last26=Narita |first26=Norio |last27=Plavchan |first27=Peter |last28=Ricker |first28=George R. |last29=Sasselov |first29=Dimitar |last30=Seager |first30=S. |display-authors=1 |title=The Revised TESS Input Catalog and Candidate Target List |journal=The Astronomical Journal |date=2019 |volume=158 |issue=4 |page=138 |doi=10.3847/1538-3881/ab3467 |doi-access=free |arxiv=1905.10694 |bibcode=2019AJ....158..138S }}</ref>
<ref name=vanLeeuwen2007>{{citation | postscript=. | first=F. | last=van Leeuwen | date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | arxiv=0708.1752 | s2cid=18759600 }}</ref>
<ref name=Anderson2012>{{cite XHIP|70104}}</ref>
<ref name=David2015>{{citation | last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. | title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | journal=The Astrophysical Journal | volume=804 | issue=2 | pages=146 | year=2015 | bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146 | arxiv=1501.03154 | s2cid=33401607 | postscript=. }}</ref>
<ref name=vonEiff2012>{{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=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=Eggleton2008>{{citation | title=A catalogue of multiplicity among bright stellar systems | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869 | date=2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | arxiv=0806.2878 | bibcode=2008MNRAS.389..869E | s2cid=14878976 | postscript=. }}</ref>
<ref name=houk1978>{{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=2 | publication-place=Ann Arbor | year=1978 | publisher=Dept. of Astronomy, University of Michigan | bibcode=1978mcts.book.....H | postscript=. }}</ref>
</references>
{{Stars of Lupus}}
[[Category:F-type subgiants]] [[Category:Lupus (constellation)]] [[Category:Durchmusterung objects|CD-44 09236]] [[Category:Henry Draper Catalogue objects|125442]] [[Category:Hipparcos objects|070104]] [[Category:Bright Star Catalogue objects|5364]]