Exoplanet · gas giant
HR 8799 b
HR 8799 b is a gas giant orbiting the star HR 8799. Its year lasts 170,000 Earth days. It was discovered in 2008 by the Imaging method.
| Host star | HR 8799 |
|---|---|
| Distance | 134.5 light-years (41.2 pc) |
| Orbital period | 465 years |
| Orbital radius | 68 AU |
| Radius | 13 R⊕ · 1.16 R♃ |
| Mass | 2,000 M⊕ · 6.29 M♃ |
| Density | 5 g/cm³ |
| Surface gravity | 11.8 × Earth |
| Equilibrium temperature | 1,200 K (927 °C) |
| Stellar flux received | 0.0011 × Earth |
| Discovery method | Imaging |
| Discovery year | 2008 |
| Discovered by | Gemini Observatory |
Habitable zone
Beyond the habitable zone: it receives only %0.11 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 0.012° across: 0.022 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 69° S. North of latitude 69° N it never sets. It stands highest at midnight in September, the best time to observe it.
Light's journey
The light you see tonight set out around the year 1891. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.4 million years.
Planets in the same system
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.