{{short description|Binary star in the constellation Lupus}} {{Starbox begin}} <!--{{Starbox image | image= }}--> {{Starbox observe 2s | epoch = J2000 | constell = [[Lupus (constellation)|Lupus]]<ref name=XHIP/> | component1 = A | ra1 = {{RA|14|20|09.7016}}<ref name=DR3a/> | dec1 = {{DEC|-43|03|31.834}}<ref name=DR3a/> | appmag_v1 = 5.77<ref name=WDS/> | component2 = B | ra2 = {{RA|14|20|09.4278}}<ref name=DR3b/> | dec2 = {{DEC|-43|03|30.025}}<ref name=DR3b/> | appmag_v2 = 7.94<ref name=WDS/> }} {{Starbox character | type = [[giant star|giant]] + [[subgiant]]<ref name=Kammerer2025/> | class = G8 III + G0 IV<ref name=Corbally1984/> | u-b = | b-v = {{Val|0.907|0.001}}<ref name=XHIP/> }} {{Starbox astrometry | component1 = A | radial_v = {{Val|-19.0|0.4}}<ref name=XHIP/> | prop_mo_ra = {{Val|-9.840}} | prop_mo_dec = {{Val|+7.828}} | pm_footnote = <ref name=DR3a/> | parallax = 7.9485 | p_error = 0.0563 | parallax_footnote = <ref name=DR3a/> | absmag_v = +0.3<ref name=XHIP/> | component2 = B | prop_mo_ra2 = {{Val|-7.301}} | prop_mo_dec2 = {{Val|+5.219}} | pm_footnote2 = <ref name=DR3b/> | parallax2 = 8.0287 | p_error2 = 0.0361 | parallax_footnote2 = <ref name=DR3b/> }} {{Starbox detail | component1 = A | source = <ref name=Kammerer2025/> | radius = {{Val|11.77|0.06|0.05}} | luminosity = 84<ref name=XHIP/> | temperature = {{Val|5784|30|46|fmt=commas}} | gravity = {{Val|3.00|0.00}} | component2 = B | radius2 = {{Val|2.02|0.08}} | temperature2 = {{Val|5947|71|73|fmt=commas}} | gravity2 = {{Val|3.84|0.68|0.52}} }} {{Starbox catalog | names = {{odlist |CD=-42°9235 |HD=125383 |HIP=70054 |HR=5362 | WDS=J14202-4304 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad=HD+125383 | sn = HD 125383 A | Simbad2 = HD+125383+B | sn2 = HD 125383 B }} {{Starbox end}} '''HD 125383''' is a [[binary star]] in the constellation [[Lupus (constellation)|Lupus]]. At a combined [[apparent magnitude]] of +5.55,<ref name=XHIP/> it is faintly visible to the [[naked eye]] in locations far from [[light pollution]]. [[Parallax]] measurements give distances of {{convert|125.8|pc|ly|order=flip|abbr=off|lk=on}} and {{convert|124.6|pc|ly|order=flip|abbr=off}} for the primary and secondary, respectively.
==Characteristics== The two components are separated by 3.5" along a [[position angle]] of 301°, {{as of|lc=y|2016}}.<ref name=WDS/> They have [[apparent magnitude]]s of 5.77 and 7.94.<ref name=WDS/>
The primary (A) has a [[spectral class]] of G8 III, with the [[luminosity class]] 'III' suggesting it is a [[giant star|giant]] that has exhausted the [[hydrogen]] at its [[stellar core|core]].<ref name=Corbally1984/> The star has expanded to 11.8 times the [[Sun's radius]]<ref name=Kammerer2025/> and now radiates 84 times the [[Sun's luminosity]] from its [[photosphere]]<ref name=XHIP/> at an [[effective temperature]] of {{Val|5784|ul=K|fmt=commas}}.<ref name=Kammerer2025/> This temperature gives it a yellow hue typical of a [[G-type star]].<ref name=csiro/>
The secondary (B) has a spectral class of G0 IV, with the luminosity class 'IV' suggesting it is a subgiant that has exhausted the hydrogen at its core.<ref name=Corbally1984/> The star has expanded to 2.0 times the [[Sun's radius]] and has an [[effective temperature]] of {{Val|5947|ul=K|fmt=commas}}.<ref name=Kammerer2025/> This temperature gives it a yellow hue typical of a [[G-type star]].<ref name=csiro/>
==References== {{reflist|refs=
<ref name=SIMBAD>{{Cite SIMBAD|title=HD 125383}}</ref>
<ref name=XHIP>{{cite XHIP|70054}}</ref>
<ref name=DR3a>{{cite DR3|6103516765233511808}}</ref>
<ref name=DR3b>{{cite DR3|6103516765233511680}}</ref>
<ref name=Kammerer2025>{{Cite journal |last1=Kammerer |first1=J. |last2=Winterhalder |first2=T. O. |last3=Lacour |first3=S. |last4=Stolker |first4=T. |last5=Marleau |first5=G.-D. |last6=Balmer |first6=W. O. |last7=Moore |first7=A. F. |last8=Piscarreta |first8=L. |last9=Toci |first9=C. |last10=Mérand |first10=A. |last11=Nowak |first11=M. |last12=Rickman |first12=E. L. |last13=Pueyo |first13=L. |last14=Pourré |first14=N. |last15=Nasedkin |first15=E. |date=2025-12-01 |title=The ExoGRAVITY survey: A K-band spectral library of giant exoplanet and brown dwarf companions |journal=Astronomy & Astrophysics |language=en |volume=704 |pages=A318 |doi=10.1051/0004-6361/202556860 |arxiv=2510.08691 |bibcode=2025A&A...704A.318K |issn=0004-6361}}</ref>
<ref name=Corbally1984>{{Cite journal |last=Corbally |first=C. J. |date=December 1984 |title=Close visual binaries. III. Parameters and evolutionary status. |bibcode=1984AJ.....89.1887C |journal=The Astronomical Journal |language=en |volume=89 |pages=1887–1896 |doi=10.1086/113700 |issn=0004-6256}}</ref>
<ref name=WDS>{{cite journal|last1=Mason|first1=Brian D.|last2=Wycoff|first2=Gary L.|last3=Hartkopf|first3=William I.|last4=Douglass|first4=Geoffrey G.|last5=Worley|first5=Charles E.|title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog|journal=The Astronomical Journal|volume=122|issue=6|year=2001|pages=3466–3471|issn=0004-6256|doi=10.1086/323920|bibcode = 2001AJ....122.3466M |doi-access=free}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=B/wds&recno=87449 HD 125383's database entry] at [[VizieR]].</ref>
<ref name=csiro>{{cite web | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=Commonwealth Scientific and Industrial Research Organisation | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | accessdate=2012-01-16 | archive-date=2013-12-03 | archive-url=https://web.archive.org/web/20131203222826/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | url-status=dead }}</ref>
}}
{{Stars of Lupus}} [[Category:Lupus (constellation)]] [[Category:G-type giants]] [[Category:G-type subgiants]] [[Category:Hipparcos objects|070054]] [[Category:Henry Draper Catalogue objects|125383]] [[Category:Bright Star Catalogue objects|5362]] [[Category:Durchmusterung objects|-42°9235]]