Exoplanet · gas giant
HATS-40 b
HATS-40 b is a gas giant orbiting the star HATS-40. Its year lasts 3.26 Earth days. It was discovered in 2018 by the Transit method.
| Host star | HATS-40 |
|---|---|
| Distance | 4,378 light-years (1,342 pc) |
| Orbital period | 3.26 days |
| Orbital radius | 0.05 AU |
| Eccentricity | 0.312 |
| Radius | 17.7 R⊕ · 1.58 R♃ |
| Mass | 505 M⊕ · 1.59 M♃ |
| Density | 0.49 g/cm³ |
| Surface gravity | 1.61 × Earth |
| Equilibrium temperature | 2,101 K (1,828 °C) |
| Stellar flux received | 3,160 × Earth |
| Discovery method | Transit |
| Discovery year | 2018 |
| Discovered by | HATSouth |
Habitable zone
Inside the inner edge of the habitable zone: it receives 3,160 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 24° across: 45 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 13.48. Visible from the whole Southern Hemisphere and north to latitude 60° N. South of latitude 60° S it never sets. It stands highest at midnight in December, the best time to observe it.
Light's journey
The light you see tonight set out 4,378 years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 78 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.