HD 143811

HD 143811 is a spectroscopic binary system in the 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, it is located at a distance of.
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. HD 143811 has a debris disk located at 8.5 astronomical units, with an estimated temperature of, and is orbited by one known exoplanet, at 63 au.

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, while the other used the SPHERE instrument aboard the Very Large Telescope and the Gemini Planet Imager. Additionally, its existence was inferred using astrometry. The planet, named HD 143811 b, is a gas giant with 6.1 times the mass of Jupiter, 1.4 to 1.7 times Jupiter's radius, and a temperature of. It has a circumbinary orbit, having a semi-major axis of 63 astronomical units, and an orbital period of roughly 300 years.