Exoplanet · gas giant
HD 139357 b
HD 139357 b is a gas giant orbiting the star HD 139357. Its year lasts 1,120 Earth days. It was discovered in 2008 by the Radial Velocity method.
| Host star | HD 139357 |
|---|---|
| Distance | 365.6 light-years (112.1 pc) |
| Orbital period | 3.08 years |
| Orbital radius | 2.95 AU |
| Eccentricity | 0.099 |
| Radius | 12.1 R⊕ · 1.08 R♃ |
| Mass | 6,320 M⊕ · 19.9 M♃ |
| Density | 19.6 g/cm³ |
| Surface gravity | 43.1 × Earth |
| Equilibrium temperature | 447 K (174 °C) |
| Stellar flux received | 7.65 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2008 |
| Discovered by | Thueringer Landessternwarte Tautenburg |
Habitable zone
Inside the inner edge of the habitable zone: it receives 7.65 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 2.1° across: 3.9 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.97). Visible from the whole Northern Hemisphere and south to latitude 36° S. North of latitude 36° N 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 1660. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6.5 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.