Exoplanet · gas giant
HD 224538 b
HD 224538 b is a gas giant orbiting the star HD 224538. Its year lasts 1,200 Earth days. It was discovered in 2016 by the Radial Velocity method.
| Host star | HD 224538 |
|---|---|
| Distance | 257.9 light-years (79.1 pc) |
| Orbital period | 3.29 years |
| Orbital radius | 2.38 AU |
| Eccentricity | 0.476 |
| Radius | 12.7 R⊕ · 1.13 R♃ |
| Mass | 2,080 M⊕ · 6.53 M♃ |
| Density | 5.57 g/cm³ |
| Surface gravity | 12.9 × Earth |
| Equilibrium temperature | 237 K (-36 °C) |
| Stellar flux received | 0.523 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2016 |
| Discovered by | Multiple Observatories |
Habitable zone
Inside its star's habitable zone: it receives enough light for liquid water to exist on its surface under a suitable atmosphere.
Its star in the sky
In the planet's sky its star is a disc 0.35° across: 0.65 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 8.06); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 28° N. South of latitude 28° S it never sets. It stands highest at midnight in September, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1768. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.6 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.