Exoplanet · gas giant
HIP 111909 b
HIP 111909 b is a gas giant orbiting the star HIP 111909. Its year lasts 487 Earth days. It was discovered in 2025 by the Radial Velocity method.
| Host star | HIP 111909 |
|---|---|
| Distance | 287.3 light-years (88.1 pc) |
| Orbital period | 487 days |
| Orbital radius | 1.32 AU |
| Radius | 13.7 R⊕ · 1.22 R♃ |
| Mass (minimum) | 385 M⊕ · 1.21 M♃ |
| Density | 0.822 g/cm³ |
| Equilibrium temperature | 437 K (164 °C) |
| Stellar flux received | 6.01 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2025 |
| Discovered by | Multiple Observatories |
Habitable zone
Inside the inner edge of the habitable zone: it receives 6.01 times the light the Earth does, too hot to keep liquid water on its surface.
Its star in the sky
In the planet's sky its star is a disc 1.8° across: 3.4 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 7.37); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 40° N. South of latitude 40° S it never sets. It stands highest at midnight in August, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1739. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.1 million years.
Planets in the same system
- HIP 111909 c 894-day orbit · 13.9 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.