Exoplanet · gas giant
HN Peg b
HN Peg b is a gas giant orbiting the star HN Peg. It was discovered in 2006 by the Imaging method.
| Host star | HN Peg |
|---|---|
| Distance | 59.1 light-years (18.1 pc) |
| Orbital radius | 773 AU |
| Radius | 11.8 R⊕ · 1.05 R♃ |
| Mass | 6,990 M⊕ · 22 M♃ |
| Density | 23.5 g/cm³ |
| Surface gravity | 50.4 × Earth |
| Equilibrium temperature | 11 K (-262 °C) |
| Stellar flux received | 0 × Earth |
| Discovery method | Imaging |
| Discovery year | 2006 |
| Discovered by | Spitzer Space Telescope |
Habitable zone
Beyond the habitable zone: it receives only %0 of the light the Earth does, a frozen world.
Its star in the sky
In the planet's sky its star is a disc 6.9 × 10⁻⁴° across: 0.0013 times the Sun as we see it from Earth.
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.96). Visible from the whole Northern Hemisphere and south to latitude 75° S. North of latitude 75° N it never sets. 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 1967. 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.