Exoplanet · gas giant
HD 22781 b
HD 22781 b is a gas giant orbiting the star HD 22781. Its year lasts 528 Earth days. It was discovered in 2011 by the Radial Velocity method.
| Host star | HD 22781 |
|---|---|
| Distance | 106.3 light-years (32.6 pc) |
| Orbital period | 528 days |
| Orbital radius | 1.17 AU |
| Eccentricity | 0.819 |
| Radius | 12.3 R⊕ · 1.1 R♃ |
| Mass (minimum) | 4,340 M⊕ · 13.6 M♃ |
| Density | 12.8 g/cm³ |
| Equilibrium temperature | 193 K (-80 °C) |
| Stellar flux received | 0.246 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 2011 |
| Discovered by | Haute-Provence Observatory |
Habitable zone
Beyond the habitable zone: it receives only %25 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.34° across: 0.64 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 8.78); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 58° S. North of latitude 58° N it never sets. It stands highest at midnight in November, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1920. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.9 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.