Exoplanet · gas giant
HD 210277 b
HD 210277 b is a gas giant orbiting the star HD 210277. Its year lasts 442 Earth days. It was discovered in 1998 by the Radial Velocity method.
| Host star | HD 210277 |
|---|---|
| Distance | 69.5 light-years (21.3 pc) |
| Orbital period | 442 days |
| Orbital radius | 1.13 AU |
| Eccentricity | 0.480 |
| Radius | 13.6 R⊕ · 1.21 R♃ |
| Mass (minimum) | 410 M⊕ · 1.29 M♃ |
| Density | 0.896 g/cm³ |
| Equilibrium temperature | 260 K (-13 °C) |
| Stellar flux received | 0.728 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 1998 |
| Discovered by | W. M. Keck Observatory |
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 0.5° across: 0.95 times the Sun as we see it from Earth.
In the sky
Too faint for the naked eye (magnitude 6.54); binoculars will find it. Visible from the whole Southern Hemisphere and north to latitude 82° N. It stands highest at midnight in August, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1957. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.2 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.