# HD 143811

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Binary star in the constellation Lupus

HD 143811 HD 143811 AB b (arrow) with Gemini in 2019. The star is behind the black disk of the coronagraph in the center. Observation data Epoch J2000 Equinox J2000 Constellation Lupus[1] Right ascension 16h 03m 33.425s[2] Declination −30° 08′ 13.38″[2] Apparent magnitude (V) +8.91±0.01[3] Characteristics Evolutionary stage main sequence[2] Spectral type F5V[4] Astrometry Radial velocity (Rv) +0.48±0.02[5] km/s Proper motion (μ) RA: −14.850 mas/yr[2] Dec.: −24.984 mas/yr[2] Parallax (π) 7.3065±0.0204 mas[2] Distance 446 ± 1 ly (136.9 ± 0.4 pc) Orbit[5] Period (P) 18.59098(7) days Semi-major axis (a) 0.1854+0.0014 −0.0024 au Eccentricity (e) 0.4935±0.0013 Inclination (i) 22.9+0.3 −0.2° Periastron epoch (T) 58230.438±0.006 MJD Argument of periastron (ω) (secondary) 335.91±0.18° Argument of periastron (ω) (primary) 155.91±0.18° Semi-amplitude (K1) (primary) 22.76±0.05 km/s Semi-amplitude (K2) (secondary) 25.71±0.06 km/s Details[5] A Mass 1.30+0.03 −0.05 M☉ Temperature 6,751+207 −148 K Metallicity [Fe/H] −0.18±0.10 dex Rotational velocity (v sin i) 6.8±0.6 km/s Age 20.9+1.8 −1.7 Myr B Mass 1.15+0.03 −0.04 M☉ Temperature 6,349+122 −133 K Metallicity [Fe/H] −0.18±0.10 dex Rotational velocity (v sin i) 2.8±1.4 km/s Age 20.9+1.8 −1.7 Myr Other designations CD−29°12217, HD 143811, HIP 78663, TYC 7330-289-1[6] Database references SIMBAD data

**HD 143811** is a [spectroscopic binary](/source/Spectroscopic_binary)[7] system in the constellation [Lupus](/source/Lupus_(constellation)). Its [apparent magnitude](/source/Apparent_magnitude) is 8.91, too faint to be visible with the [naked eye](/source/Naked_eye). Based on [parallax](/source/Parallax) measurements from the [Gaia](/source/Gaia_(spacecraft)) spacecraft, it is located at a distance of 446 [light-years](/source/Light-year) (137 [parsecs](/source/Parsec)).

The system is a member of the [Scorpius–Centaurus association](/source/Scorpius%E2%80%93Centaurus_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](/source/Eccentric_orbit) for such a short orbital period.[5] HD 143811 has a debris disk located at 8.5 [astronomical units](/source/Astronomical_unit), with an estimated temperature of 140 K (−133 °C),[8] and is orbited by one known exoplanet, at 63 au.[7]

## Planetary system

In 2025, two independent teams found a planet orbiting the system using the [direct imaging](/source/Direct_imaging) technique. One used the [Gemini Planet Imager](/source/Gemini_Planet_Imager) and the NIRC-2 camera aboard the [Keck telescope](/source/Keck_telescope),[9] while the other used the [SPHERE](/source/SPHERE) instrument aboard the [Very Large Telescope](/source/Very_Large_Telescope) and the Gemini Planet Imager.[7] Additionally, its existence was inferred using [astrometry](/source/Methods_of_detecting_exoplanets#Astrometry).[7] The planet, named **HD 143811 b**, is a [gas giant](/source/Gas_giant) with 6.1 times the mass of Jupiter ([MJ](/source/Jupiter_mass)),[7] 1.4 to 1.7 times Jupiter's radius ([RJ](/source/Jupiter_radius)),[9] and a temperature of 1,000±30 [K](/source/Kelvin). It has a [circumbinary](/source/Circumbinary_planet) orbit, having a [semi-major axis](/source/Semi-major_axis) of 63 astronomical units, and an orbital period of roughly 300 years.[7][10]

The HD 143811 planetary system[7] Companion (in order from star) Mass Semimajor axis (AU) Orbital period (years) Eccentricity Inclination (°) Radius b 6.1+0.7 −0.9 MJ 63+30 −12 319+248 −86 0.19±0.12 37+11 −12 1.41±0.03 – 1.7+0.7 −0.4[9] RJ

## References

1. **[^](#cite_ref-XHIP_1-0)** Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". *[Astronomy Letters](/source/Astronomy_Letters)*. **38** (5): 331. [arXiv](/source/ArXiv_(identifier)):[1108.4971](https://arxiv.org/abs/1108.4971). [Bibcode](/source/Bibcode_(identifier)):[2012AstL...38..331A](https://ui.adsabs.harvard.edu/abs/2012AstL...38..331A). [doi](/source/Doi_(identifier)):[10.1134/S1063773712050015](https://doi.org/10.1134%2FS1063773712050015). [XHIP record for this object](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ681510a8389ecb&-out.src=V%2F137D%2FXHIP&-nav=cat%3AV%2F137D%26tab%3A{V%2F137D%2FXHIP}%26key%3Asource%3DV%2F137D%2FXHIP%26HTTPPRM%3A&-source=V%2F137D%2FXHIP&-out=HIP&HIP=78663&-out=Comp&-out=Gr&-out=RAJ2000&-out=DEJ2000&-out=Dist&-out=X&-out=Y&-out=Z&-out=SpType&-out=Simbad&-out=Hpmag&-out=Lum&-out=Cst) at [VizieR](/source/VizieR).

1. ^ [***a***](#cite_ref-DR3_2-0) [***b***](#cite_ref-DR3_2-1) [***c***](#cite_ref-DR3_2-2) [***d***](#cite_ref-DR3_2-3) [***e***](#cite_ref-DR3_2-4) Vallenari, A.; et al. (Gaia collaboration) (2023). ["*Gaia* Data Release 3. Summary of the content and survey properties"](https://doi.org/10.1051%2F0004-6361%2F202243940). *Astronomy and Astrophysics*. **674**: A1. [arXiv](/source/ArXiv_(identifier)):[2208.00211](https://arxiv.org/abs/2208.00211). [Bibcode](/source/Bibcode_(identifier)):[2023A&A...674A...1G](https://ui.adsabs.harvard.edu/abs/2023A&A...674A...1G). [doi](/source/Doi_(identifier)):[10.1051/0004-6361/202243940](https://doi.org/10.1051%2F0004-6361%2F202243940). [S2CID](/source/S2CID_(identifier)) [244398875](https://api.semanticscholar.org/CorpusID:244398875). [Gaia DR3 record for this source](https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-source=+I%2F355&-from=nav&-nav=cat%3AI%2F355%26tab%3A%7BI%2F355%2Fgaiadr3%7D%26key%3Asource%3D1355%2Fgaiadr3%26HTTPPRM%3A%26-out.add%3D.%26Source%3D%3D%3D6040105283968486144%26-go+%25%23Sesame%23%25%26) at [VizieR](/source/VizieR).

1. **[^](#cite_ref-Hog2000_3-0)** Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". *Astronomy and Astrophysics*. **355**. [Bibcode](/source/Bibcode_(identifier)):[2000A&A...355L..27H](https://ui.adsabs.harvard.edu/abs/2000A&A...355L..27H).

1. **[^](#cite_ref-Houk1982_4-0)** Houk, N. (1982). *Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0*. [Bibcode](/source/Bibcode_(identifier)):[1982mcts.book.....H](https://ui.adsabs.harvard.edu/abs/1982mcts.book.....H).

1. ^ [***a***](#cite_ref-Peck2025_5-0) [***b***](#cite_ref-Peck2025_5-1) [***c***](#cite_ref-Peck2025_5-2) [***d***](#cite_ref-Peck2025_5-3) Peck, Anne E.; Roberson, William; Nielsen, Eric L.; Rosa, Robert J. De; Jones, Nathalie; Wang, Jason; Macintosh, Bruce; Lewis, Bailey L.; Duchêne, Gaspard (2025-09-08). "Characterization of the Host Binary of the Directly Imaged Exoplanet HD 143811 AB b". [arXiv](/source/ArXiv_(identifier)):[2509.06727](https://arxiv.org/abs/2509.06727) [[astro-ph.EP](https://arxiv.org/archive/astro-ph.EP)].

1. **[^](#cite_ref-SIMBAD_6-0)** ["HD 143811"](http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+143811). *[SIMBAD](/source/SIMBAD)*. [Centre de données astronomiques de Strasbourg](/source/Centre_de_donn%C3%A9es_astronomiques_de_Strasbourg).

1. ^ [***a***](#cite_ref-Squicciarini2025_7-0) [***b***](#cite_ref-Squicciarini2025_7-1) [***c***](#cite_ref-Squicciarini2025_7-2) [***d***](#cite_ref-Squicciarini2025_7-3) [***e***](#cite_ref-Squicciarini2025_7-4) [***f***](#cite_ref-Squicciarini2025_7-5) [***g***](#cite_ref-Squicciarini2025_7-6) Squicciarini, Vito; Mazoyer, Johan; Wilkinson, Christian; Lagrange, Anne-Marie; Delorme, Philippe; Radcliffe, Alice; Flasseur, Olivier; Kiefer, Flavien; Alecian, Evelyne (2025-09-07). "GPI+SPHERE detection of a 6.1MJup circumbinary planet around HD 143811". [arXiv](/source/ArXiv_(identifier)):[2509.06009](https://arxiv.org/abs/2509.06009) [[astro-ph.EP](https://arxiv.org/archive/astro-ph.EP)].

1. **[^](#cite_ref-Cotten2016_8-0)** Cotten, Tara H.; Song, Inseok (2016-07-25). ["A Comprehensive Census of Nearby Infrared Excess Stars"](https://doi.org/10.3847%2F0067-0049%2F225%2F1%2F15). *The Astrophysical Journal Supplement Series*. **225** (1): 15. [arXiv](/source/ArXiv_(identifier)):[1606.01134](https://arxiv.org/abs/1606.01134). [Bibcode](/source/Bibcode_(identifier)):[2016ApJS..225...15C](https://ui.adsabs.harvard.edu/abs/2016ApJS..225...15C). [doi](/source/Doi_(identifier)):[10.3847/0067-0049/225/1/15](https://doi.org/10.3847%2F0067-0049%2F225%2F1%2F15). [ISSN](/source/ISSN_(identifier)) [0067-0049](https://search.worldcat.org/issn/0067-0049).

1. ^ [***a***](#cite_ref-Jones2025_9-0) [***b***](#cite_ref-Jones2025_9-1) [***c***](#cite_ref-Jones2025_9-2) Jones, Nathalie K.; Wang, Jason J.; Nielsen, Eric L.; Rosa, Robert J. De; Peck, Anne E.; Roberson, William; Ruffio, Jean-Baptiste; Xuan, Jerry W.; Macintosh, Bruce A. (2025-09-08). "HD 143811 AB b: A Directly Imaged Planet Orbiting a Spectroscopic Binary in Sco-Cen". [arXiv](/source/ArXiv_(identifier)):[2509.06729](https://arxiv.org/abs/2509.06729) [[astro-ph.EP](https://arxiv.org/archive/astro-ph.EP)].

1. **[^](#cite_ref-10)** published, Robert Lea (2025-12-11). ["Astronomers discover images of rare Tatooine-like exoplanet with a strange 300-year orbit: 'Exactly how it works is still uncertain'"](https://www.space.com/astronomy/exoplanets/astronomers-discover-images-of-a-tatooine-like-exoplanet-with-a-bizarre-orbit-hidden-in-10-year-old-data). *Space*. Retrieved 2026-03-04.

v t e Constellation of Lupus List of stars in Lupus Lupus in Chinese astronomy Stars Bayer α (Uridim) β γ δ ε ζ η θ ι κ λ μ ν1 ν2 ξ ο π ρ σ τ1 τ2 υ φ1 φ2 χ ψ1 ψ2 ω Flamsteed 1 (i) 2 (f) Variable RU EX GG GQ HR II IL IM KT (d) V407 V462 HR 5362 5364 5401 5651 (e) 5724 (k) 5825 (g) 5943 5967 HD 134004 135344 136164 141943 142527 143811 Other Gliese 588 HIP 70849 Lupus-TR-3 SSSPM J1549−3544 WASP-132 Exoplanets GQ Lupi b HIP 70849 b Lupus-TR-3b WASP-178b Star clusters NGC 5749 NGC 5822 NGC 5824 NGC 5927 NGC 5986 Nebulae IC 4406 NGC 5882 Galaxies IC 4444 NGC 5530 NGC 5643 Astronomical events SN 1006 Category

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