Exoplanet · gas giant
HATS-18 b
HATS-18 b is a gas giant orbiting the star HATS-18. Its year lasts 0.838 Earth days. It was discovered in 2016 by the Transit method.
| Host star | HATS-18 |
|---|---|
| Distance | 2,036 light-years (624.4 pc) |
| Orbital period | 20.1 hours |
| Orbital radius | 0.0174 AU |
| Eccentricity | 0.166 |
| Radius | 14.9 R⊕ · 1.33 R♃ |
| Mass | 629 M⊕ · 1.98 M♃ |
| Density | 1.12 g/cm³ |
| Surface gravity | 2.84 × Earth |
| Equilibrium temperature | 2,069 K (1,796 °C) |
| Stellar flux received | 2,990 × Earth |
| Discovery method | Transit |
| Discovery year | 2016 |
| Discovered by | Multiple Observatories |
Habitable zone
Inside the inner edge of the habitable zone: it receives 2,990 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 30° across: 57 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 14.19. Visible from the whole Southern Hemisphere and north to latitude 61° N. South of latitude 61° S it never sets. It stands highest at midnight in March, the best time to observe it.
Light's journey
The light you see tonight set out around 11 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 36 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.