{{Short description|Star in the constellation Lupus}} {{Starbox begin}} {{Starbox observe | epoch = J2000 | constell = [[Lupus (constellation)|Lupus]]<ref name=Anderson2012/> | ra = {{RA|14|27|12.15415}}<ref name=GaiaDR3/> | dec = {{DEC|−46|08|03.0975}}<ref name=GaiaDR3/> | appmag_v = 5.83<ref name=Anderson2012/> }} {{Starbox character | type = [[main sequence]]<ref name=GaiaDR3/> | class = A1m A5/7-F2<ref name=houk1978/> | b-v = {{Val|0.311|0.004}}<ref name=Anderson2012/> }} {{Starbox astrometry | radial_v = {{Val|−30.0|3.8}}<ref name=deBruijne2012/> | prop_mo_ra = −150.420<ref name=GaiaDR3/> | prop_mo_dec = −88.472<ref name=GaiaDR3/> | parallax = 20.6065 | p_error = 0.4550 | parallax_footnote = <ref name=GaiaDR3/> | absmag_v = +2.01<ref name=Anderson2012/> }} {{Starbox detail | source = | mass = | radius = | luminosity = 13.01<ref name=Anderson2012/> | gravity = 3.92<ref name=North1994/> | temperature = 7,300<ref name=North1994/> | metal_fe = 0.2<ref name=North1994/> | rotational_velocity = | age_myr = }} {{Starbox catalog | names={{odlist | CD=−45°9188 | HD=126504 | HIP=70663 | HR=5401 | SAO=224929 | WDS=J14272-4608A }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+126504 }} {{Starbox end}}
'''HR 5401''' is a possible [[astrometric binary]]<ref name=Eggleton2008/> [[star]] system in the southern [[constellation]] of [[Lupus (constellation)|Lupus]]. With an [[apparent visual magnitude]] of 5.83,<ref name=Anderson2012/> it is just visible to the naked eye under good seeing conditions. The distance to HR 5401 can be estimated from its annual [[stellar parallax|parallax shift]] of {{Val|20.6|ul=mas}},<ref name=GaiaDR3/> yielding a range of 158 [[light year]]s. It is moving closer to Earth with a heliocentric [[radial velocity]] of −30 km/s,<ref name=deBruijne2012/> and is expected to come within {{Convert|49.43|pc|ly|abbr=on|disp=out|sigfig=3}} in ~524,000 years.<ref name=Anderson2012/>
This is an [[Am star]]<ref name=Schroeder2007/> with a [[stellar classification]] of A1m A5/7-F2.<ref name=houk1978/> Lu (1991) lists it as a likely dwarf [[barium star]].<ref name=lu1991/> It is radiating 13<ref name=Anderson2012/> times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of 7,300 K.<ref name=North1994/> This system is a source of [[X-ray astronomy|X-ray emission]] which may be coming from the companion.<ref name=Schroeder2007/>
HR 5401 has two visual companions. Component B is a magnitude 11.50 star at an [[angular separation]] of {{Val|33.1|ul=arcsecond}} along a [[position angle]] (PA) of 114°, as of 1999. The second companion, designated component C, is magnitude 11.16 with a separation of {{Val|27.20|u=arcsecond}} at a PA of 164°, as of 2000.<ref name=wds2006/>
==References== <references>
<ref name=SIMBAD>{{cite simbad | title=HD 126504 | access-date=2018-07-30 }}</ref>
<ref name=GaiaDR3>{{cite Gaia DR3|6093066628770287104}}</ref>
<ref name=Anderson2012>{{cite XHIP|70663}}</ref>
<ref name=lu1991>{{citation | postscript=. | title=Taxonomy of barium stars | last1=Lu | first1=Phillip K. | journal=Astronomical Journal | volume=101 | pages=2229 | year=1991 | bibcode=1991AJ....101.2229L | doi=10.1086/115845 | doi-access=free}}</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>
<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=North1994>{{citation | display-authors=1 | last1=North | first1=P. | last2=Berthet | first2=S. | last3=Lanz | first3=T. | title=The nature of the F STR lambda 4077 stars. 3: Spectroscopy of the barium dwarfs and other CP stars | journal=Astronomy and Astrophysics | volume=281 | issue=3 | pages=775–796 | date=January 1994 | bibcode=1994A&A...281..775N | postscript=. }}</ref>
<ref name=Schroeder2007>{{citation | last1=Schröder | first1=C. | last2=Schmitt | first2=J. H. M. M. | title=X-ray emission from A-type stars | journal=Astronomy and Astrophysics | postscript=. | volume=475 | issue=2 | pages=677–684 | date=November 2007 | doi=10.1051/0004-6361:20077429 | bibcode=2007A&A...475..677S | doi-access=free }}</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=wds2006>{{citation | display-authors=1 | last1=Mason | first1=B. D. | last2=Wycoff | first2=G. L. I. | last3=Hartkopf | first3=W. I. | date=2008 | title=Washington Visual Double Star Catalog, 2006.5 (WDS) | journal=The Astronomical Journal | volume=122 | issue=6 | page=3466 | bibcode=2001AJ....122.3466M | postscript=. | publisher=U. S. Naval Observatory, Washington D.C. | doi=10.1086/323920 | doi-access=free }}</ref>
</references>
{{Stars of Lupus}}
[[Category:Am stars]] [[Category:Astrometric binaries]] [[Category:Lupus (constellation)]] [[Category:Durchmusterung objects]] [[Category:Henry Draper Catalogue objects|126504]] [[Category:Hipparcos objects|070663]] [[Category:Bright Star Catalogue objects|5401]]