Exoplanet · gas giant
HD 240210 b
HD 240210 b is a gas giant orbiting the star HD 240210. Its year lasts 502 Earth days. It was discovered in 2009 by the Radial Velocity method.
| Host star | HD 240210 |
|---|---|
| Distance | 1,215 light-years (372.4 pc) |
| Orbital period | 502 days |
| Orbital radius | 1.16 AU |
| Eccentricity | 0.150 |
| Radius | 12.8 R⊕ · 1.14 R♃ |
| Mass (minimum) | 1,660 M⊕ · 5.21 M♃ |
| Density | 4.34 g/cm³ |
| Equilibrium temperature | 971 K (698 °C) |
| Stellar flux received | 26.4 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2009 |
| Discovered by | McDonald Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 26.4 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 12° across: 22 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 8.47); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 33° S. North of latitude 33° N 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 811. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 22 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.