Exoplanet · gas giant
HAT-P-9 b
HAT-P-9 b is a gas giant orbiting the star Tevel. Its year lasts 3.92 Earth days. It was discovered in 2008 by the Transit method.
| Host star | Tevel |
|---|---|
| Distance | 1,485 light-years (455.2 pc) |
| Orbital period | 3.92 days |
| Orbital radius | 0.0529 AU |
| Eccentricity | 0.084 |
| Radius | 15.6 R⊕ · 1.39 R♃ |
| Mass | 238 M⊕ · 0.749 M♃ |
| Density | 0.342 g/cm³ |
| Surface gravity | 0.976 × Earth |
| Equilibrium temperature | 1,540 K (1,267 °C) |
| Stellar flux received | 931 × Earth |
| Discovery method | Transit |
| Discovery year | 2008 |
| Discovered by | HATNet |
Habitable zone
Inside the inner edge of the habitable zone: it receives 931 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 13° across: 25 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 12.34. Visible from the whole Northern Hemisphere and south to latitude 53° S. North of latitude 53° N it never sets. It stands highest at midnight in January, the best time to observe it.
Light's journey
The light you see tonight set out around the year 541. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 26 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.