Exoplanet · gas giant
NGTS-18 b
NGTS-18 b is a gas giant orbiting the star NGTS-18. Its year lasts 3.05 Earth days. It was discovered in 2021 by the Transit method.
| Host star | NGTS-18 |
|---|---|
| Distance | 3,575 light-years (1,096 pc) |
| Orbital period | 3.05 days |
| Orbital radius | 0.0448 AU |
| Eccentricity | 0.000 |
| Radius | 13.6 R⊕ · 1.21 R♃ |
| Mass | 130 M⊕ · 0.409 M♃ |
| Density | 0.28 g/cm³ |
| Surface gravity | 0.707 × Earth |
| Equilibrium temperature | 1,381 K (1,108 °C) |
| Stellar flux received | 845 × Earth |
| Discovery method | Transit |
| Discovery year | 2021 |
| Discovered by | Next-Generation Transit Survey (NGTS) |
Habitable zone
Inside the inner edge of the habitable zone: it receives 845 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 16° across: 31 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 14.59. Visible from the whole Southern Hemisphere and north to latitude 54° N. South of latitude 54° 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 1550 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 63 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.