Confirmed exoplanet · Database record + computed analysis
HD 143811 AB b
A confirmed world orbiting HD 143811 A, 445.6 light-years away.
A gas giant
15.69 Earth radii, Jupiter-class (Jupiter is 11.2).
The orbit
Its year takes 117,000 Earth days (320.3 Earth years).
Temperature and starlight
Its equilibrium temperature (the airless-world estimate) is about 769 °C. Hotter than Venus's surface. It receives only 0.00 times Earth's starlight.
Its sun
Its star is hotter than the Sun (6,791 K), burning brighter and faster. The system holds 2 stars, so its skies have more than one sun.
How far is that, really?
At 446 light-years, tonight's light from this system left it around the year 1580. A Voyager-speed probe would need roughly 7,883,035 years to get there.
How we found it
It was directly imaged, one of the rare planets actually photographed as its own point of light, possible only for young, hot, wide-orbiting giants. The discovery was announced in 2025 from Paranal Observatory.
Everything above is computed from the archive’s measured values for this planet. Where a quantity is missing, the statement is omitted rather than guessed.
About this record
The measured values come from the NASA Exoplanet Archive, and any missing value has not been determined yet; the Atlas never fills gaps with guesses. More standout worlds: Proxima b, TRAPPIST-1e, K2-18 b, 55 Cancri e, and the detection methods that found them all.