Exoplanet · gas giant
WASP-78 b
WASP-78 b is a gas giant orbiting the star WASP-78. Its year lasts 2.18 Earth days. It was discovered in 2012 by the Transit method.
| Host star | WASP-78 |
|---|---|
| Distance | 2,460 light-years (754.3 pc) |
| Orbital period | 2.18 days |
| Orbital radius | 0.0349 AU |
| Eccentricity | 0.000 |
| Radius | 21.6 R⊕ · 1.93 R♃ |
| Mass | 353 M⊕ · 1.11 M♃ |
| Density | 0.131 g/cm³ |
| Surface gravity | 0.754 × Earth |
| Equilibrium temperature | 2,470 K (2,197 °C) |
| Stellar flux received | 4,810 × Earth |
| Discovery method | Transit |
| Discovery year | 2012 |
| Discovered by | SuperWASP |
Habitable zone
Inside the inner edge of the habitable zone: it receives 4,810 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 36° across: 68 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 12.04. Visible from the whole Southern Hemisphere and north to latitude 68° N. South of latitude 68° S it never sets. It stands highest at midnight in November, the best time to observe it.
Light's journey
The light you see tonight set out around 435 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 44 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.