}}{{Starbox reference
| Simbad = HD+126504
}}{{Starbox end}}HR 5401 is a possible astrometric binary[16] star system in the southern constellation of Lupus. With an apparent visual magnitude of 5.83,[3] it is just visible to the naked eye under good seeing conditions. The distance to HR 5401 can be estimated from its annual parallax shift of {{Val|15.9|ul=mas}},[1] yielding a range of 205 light years. It is moving closer to Earth with a heliocentric radial velocity of −30 km/s,[6] and is expected to come within {{Convert|49.43|pc|ly|abbr=on|disp=out|sigfig=3}} in ~524,000 years.[3]This is an Am star[21] with a stellar classification of A1m A5/7-F2.[4] Lu (1991) lists it as a likely dwarf barium star.[23] It is radiating 13[3] times the Sun's luminosity from its photosphere at an effective temperature of 7,300 K.[12] This system is a source of X-ray emission which may be coming from the companion.[21]
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.[27]
References
1. ^1 2 3 4 5 6 {{cite DR2}}
2. ^1 2 3 4 5 6 7 {{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 | postscript=. }}
3. ^1 {{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 }}
4. ^1 2 {{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=. }}
5. ^1 {{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 | arxiv=0806.2878 | bibcode=2008MNRAS.389..869E | postscript=. }}
6. ^1 2 3 4 {{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=. }}
7. ^1 2 {{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 }}
8. ^1 2 {{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 | postscript=. }}
9. ^1 {{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) | bibcode=2001AJ....122.3466M | postscript=. | publisher=U. S. Naval Observatory, Washington D.C. | doi=10.1086/323920 }}