{{short description|Binary star in the constellation Lupus}} {{Starbox begin}} {{Starbox image | image= [[File:HD 143811 AB b Gemini Planet Imager.png|250px]] | caption= HD 143811 AB b (arrow) with Gemini in 2019. The star is behind the black disk of the coronagraph in the center. }} {{Starbox observe | epoch = J2000 | constell = [[Lupus (constellation)|Lupus]]<ref name=XHIP/> | ra = {{RA|16|03|33.425}}<ref name=DR3/> | dec = {{DEC|-30|08|13.38}}<ref name=DR3/> | appmag_v = {{Val|+8.91|0.01}}<ref name=Hog2000/> }} {{Starbox character | type = [[main sequence]]<ref name=DR3/> | class = F5V<ref name=Houk1982/> | u-b = | b-v = }} {{Starbox astrometry | radial_v = {{Val|+0.48|0.02}}<ref name=Peck2025/> | prop_mo_ra = {{Val|-14.850}} | prop_mo_dec = {{val|-24.984}} | pm_footnote = <ref name=DR3/> | parallax = 7.3065 | p_error = 0.0204 | parallax_footnote = <ref name=DR3/> | absmag_v = }} {{Starbox orbit | reference = <ref name=Peck2025/> | period_unitless = {{val|18.59098|(7)}} days | axis_unitless = {{Val|0.1854|0.0014|0.0024|ul=au}} | eccentricity = {{Val|0.4935|0.0013}} | inclination = {{Val|22.9|0.3|0.2}} | periastron = {{val|58230.438|0.006}} [[Modified Julian date|MJD]] | periarg = {{Val|335.91|0.18}} | periarg_primary = {{Val|155.91|0.18}} | k1 = {{Val|22.76|0.05}} | k2 = {{Val|25.71|0.06}} }} {{Starbox detail | source = <ref name=Peck2025/> | component1 = A | mass = {{Val|1.30|0.03|0.05}} | radius = | luminosity = | temperature = {{val|6751|207|148|fmt=commas}} | gravity = | metal_fe = {{Val|-0.18|0.10}} | rotational_velocity = {{Val|6.8|0.6}} | age_myr = {{Val|20.9|1.8|1.7}} | component2 = B | mass2 = {{Val|1.15|0.03|0.04}} | radius2 = | luminosity2 = | temperature2 = {{val|6349|122|133|fmt=commas}} | gravity2 = | metal2_fe = {{Val|-0.18|0.10}} | rotational_velocity2 = {{Val|2.8|1.4}} | age_myr2 = {{Val|20.9|1.8|1.7}} }} {{Starbox catalog | names = {{odlist |HD=143811 | HIP=78663 | CD=-29°12217 | TYC=7330-289-1 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad=HD+143811 }} {{Starbox end}} '''HD 143811''' is a [[spectroscopic binary]]<ref name=Squicciarini2025/> system in the constellation [[Lupus (constellation)|Lupus]]. Its [[apparent magnitude]] is 8.91, too faint to be visible with the [[naked eye]]. Based on [[parallax]] measurements from the [[Gaia (spacecraft)|Gaia]] spacecraft, it is located at a distance of {{convert|446|ly|pc|abbr=off|lk=on}}.
The system is a member of the [[Scorpius–Centaurus association]], and has an estimated age of 21 million years. The two stellar components are a bit more massive and hotter than the Sun. They take 18.59 days to orbit each other, and have an unusually [[eccentric orbit]] for such a short orbital period.<ref name=Peck2025/> HD 143811 has a debris disk located at 8.5 [[astronomical unit]]s, with an estimated temperature of {{convert|140|K|C}},<ref name=Cotten2016/> and is orbited by one known exoplanet, at 63 au.<ref name=Squicciarini2025/>
==Planetary system== In 2025, two independent teams found a planet orbiting the system using the [[direct imaging]] technique. One used the [[Gemini Planet Imager]] and the NIRC-2 camera aboard the [[Keck telescope]],<ref name=Jones2025/> while the other used the [[SPHERE]] instrument aboard the [[Very Large Telescope]] and the Gemini Planet Imager.<ref name=Squicciarini2025/> Additionally, its existence was inferred using [[Methods_of_detecting_exoplanets#Astrometry|astrometry]].<ref name=Squicciarini2025/> The planet, named '''HD 143811 b''', is a [[gas giant]] with 6.1 times the mass of Jupiter ({{jupiter mass|link=y}}),<ref name=Squicciarini2025/> 1.4 to 1.7 times Jupiter's radius ({{jupiter radius|link=y}}),<ref name=Jones2025/> and a temperature of {{Val|1000|30|ul=K|fmt=commas}}. It has a [[circumbinary planet|circumbinary]] orbit, having a [[semi-major axis]] of 63 astronomical units, and an orbital period of roughly 300 years.<ref name=Squicciarini2025/><ref>{{Cite web |last=published |first=Robert Lea |date=2025-12-11 |title=Astronomers discover images of rare Tatooine-like exoplanet with a strange 300-year orbit: 'Exactly how it works is still uncertain' |url=https://www.space.com/astronomy/exoplanets/astronomers-discover-images-of-a-tatooine-like-exoplanet-with-a-bizarre-orbit-hidden-in-10-year-old-data |access-date=2026-03-04 |website=Space |language=en}}</ref>
{{OrbitboxPlanet begin | name = HD 143811 | table_ref = <ref name=Squicciarini2025/> | period_unit = year }} {{OrbitboxPlanet | exoplanet = {{nsl|HD 143811 b|b}} | mass = {{Val|6.1|0.7|0.9}} | radius = {{val|1.41|0.03}}{{snd}}{{Val|1.7|0.7|0.4}}<ref name=Jones2025/> | period = {{Val|319|248|86}} | semimajor = {{val|63|30|12}} | eccentricity = {{Val|0.19|0.12}} | inclination = {{val|37|11|12}} }} {{Orbitbox end}}
==References== {{Reflist|refs=
<ref name=XHIP>{{cite XHIP|78663}}</ref>
<ref name=SIMBAD>{{Cite SIMBAD|title=HD 143811}}</ref>
<ref name=DR3>{{Cite DR3|6040105283968486144}}</ref>
<ref name=Hog2000>{{cite journal|last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=2000 |volume=355 |bibcode=2000A&A...355L..27H}}</ref>
<ref name=Cotten2016>{{Cite journal |last1=Cotten |first1=Tara H. |last2=Song |first2=Inseok |date=2016-07-25 |title=A Comprehensive Census of Nearby Infrared Excess Stars |journal=The Astrophysical Journal Supplement Series |language=en |volume=225 |issue=1 |pages=15 |doi=10.3847/0067-0049/225/1/15 |arxiv=1606.01134 |doi-access=free |bibcode=2016ApJS..225...15C |issn=0067-0049}}</ref>
<ref name=Houk1982>{{cite book|last1=Houk |first1=N. |title=Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0 |date=1982 |bibcode=1982mcts.book.....H}}</ref>
<ref name=Squicciarini2025>{{cite arXiv |last1=Squicciarini |first1=Vito |last2=Mazoyer |first2=Johan |last3=Wilkinson |first3=Christian |last4=Lagrange |first4=Anne-Marie |last5=Delorme |first5=Philippe |last6=Radcliffe |first6=Alice |last7=Flasseur |first7=Olivier |last8=Kiefer |first8=Flavien |last9=Alecian |first9=Evelyne |title=GPI+SPHERE detection of a 6.1MJup circumbinary planet around HD 143811 |date=2025-09-07 |class=astro-ph.EP |eprint=2509.06009 }}</ref>
<ref name=Jones2025>{{cite arXiv |last1=Jones |first1=Nathalie K. |last2=Wang |first2=Jason J. |last3=Nielsen |first3=Eric L. |last4=Rosa |first4=Robert J. De |last5=Peck |first5=Anne E. |last6=Roberson |first6=William |last7=Ruffio |first7=Jean-Baptiste |last8=Xuan |first8=Jerry W. |last9=Macintosh |first9=Bruce A. |title=HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen |date=2025-09-08 |class=astro-ph.EP |eprint=2509.06729 }}</ref>
<ref name=Peck2025>{{cite arXiv |last1=Peck |first1=Anne E. |last2=Roberson |first2=William |last3=Nielsen |first3=Eric L. |last4=Rosa |first4=Robert J. De |last5=Jones |first5=Nathalie |last6=Wang |first6=Jason |last7=Macintosh |first7=Bruce |last8=Lewis |first8=Bailey L. |last9=Duchêne |first9=Gaspard |title=Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b |date=2025-09-08 |class=astro-ph.EP |eprint=2509.06727 }}</ref>
}} {{Stars of Lupus}} [[Category:Spectroscopic binaries]] [[Category:Lupus (constellation)]] [[Category:F-type main-sequence stars]] [[Category:Henry Draper Catalogue objects|143811]] [[Category:Hipparcos objects|078663]] [[Category:Planetary systems with one confirmed planet]] [[Category:Durchmusterung objects|CD-29 12217]]