Exoplanet · gas giant
HD 189733 b
HD 189733 b is a gas giant orbiting the star HD 189733. Its year lasts 2.22 Earth days. It was discovered in 2005 by the Radial Velocity method.
| Host star | HD 189733 |
|---|---|
| Distance | 64.5 light-years (19.8 pc) |
| Orbital period | 2.22 days |
| Orbital radius | 0.0313 AU |
| Eccentricity | 0.000 |
| Radius | 12.7 R⊕ · 1.13 R♃ |
| Mass | 359 M⊕ · 1.13 M♃ |
| Density | 0.943 g/cm³ |
| Surface gravity | 2.24 × Earth |
| Equilibrium temperature | 1,209 K (936 °C) |
| Stellar flux received | 356 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2005 |
| Discovered by | Haute-Provence Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 356 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 13° across: 24 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 7.67); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 67° S. North of latitude 67° N it never sets. It stands highest at midnight in July, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1962. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.1 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.