Exoplanet · gas giant
HD 143811 AB b
HD 143811 AB b is a gas giant orbiting the star HD 143811 A. Its year lasts 117,000 Earth days. It was discovered in 2025 by the Imaging method.
| Host star | HD 143811 A |
|---|---|
| Distance | 445.6 light-years (136.6 pc) |
| Orbital period | 320 years |
| Orbital radius | 63 AU |
| Eccentricity | 0.190 |
| Radius | 15.7 R⊕ · 1.4 R♃ |
| Mass | 1,940 M⊕ · 6.1 M♃ |
| Density | 2.76 g/cm³ |
| Surface gravity | 7.87 × Earth |
| Equilibrium temperature | 1,042 K (769 °C) |
| Stellar flux received | 0.0011 × Earth |
| Discovery method | Imaging |
| Discovery year | 2025 |
| Discovered by | Paranal Observatory |
Habitable zone
Beyond the habitable zone: it receives only %0.11 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.014° across: 0.027 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 8.91); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 60° N. South of latitude 60° S it never sets. It stands highest at midnight in May, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1580. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 7.9 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.