Exoplanet · gas giant
HR 810 b
HR 810 b is a gas giant orbiting the star HR 810. Its year lasts 303 Earth days. It was discovered in 1999 by the Radial Velocity method.
| Host star | HR 810 |
|---|---|
| Distance | 56.5 light-years (17.3 pc) |
| Orbital period | 303 days |
| Orbital radius | 0.92 AU |
| Eccentricity | 0.140 |
| Radius | 12.7 R⊕ · 1.13 R♃ |
| Mass | 1,970 M⊕ · 6.2 M♃ |
| Density | 5.29 g/cm³ |
| Surface gravity | 12.2 × Earth |
| Equilibrium temperature | 330 K (56 °C) |
| Stellar flux received | 2.12 × Earth |
| Discovery method | Radial Velocity |
| Discovery year | 1999 |
| Discovered by | La Silla Observatory |
Habitable zone
Inside the inner edge of the habitable zone: it receives 2.12 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 0.65° across: 1.2 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.40). Visible from the whole Southern Hemisphere and north to latitude 39° N. South of latitude 39° S it never sets. It stands highest at midnight in October, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1970. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.0 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.