Exoplanet · gas giant
NGTS-21 b
NGTS-21 b is a gas giant orbiting the star NGTS-21. Its year lasts 1.54 Earth days. It was discovered in 2022 by the Transit method.
| Host star | NGTS-21 |
|---|---|
| Distance | 1,934 light-years (592.9 pc) |
| Orbital period | 37 hours |
| Orbital radius | 0.0236 AU |
| Eccentricity | 0.000 |
| Radius | 14.9 R⊕ · 1.33 R♃ |
| Mass | 750 M⊕ · 2.36 M♃ |
| Density | 1.25 g/cm³ |
| Surface gravity | 3.37 × Earth |
| Equilibrium temperature | 1,357 K (1,084 °C) |
| Stellar flux received | 514 × Earth |
| Discovery method | Transit |
| Discovery year | 2022 |
| Discovered by | Next-Generation Transit Survey (NGTS) |
Habitable zone
Inside the inner edge of the habitable zone: it receives 514 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 19° across: 36 times the Sun as we see it from Earth.
In the sky
A telescope is needed to see it: its apparent magnitude is 15.51. Visible from the whole Southern Hemisphere and north to latitude 55° N. South of latitude 55° S it never sets. It stands highest at midnight in July, the best time to observe it.
Light's journey
The light you see tonight set out around the year 92. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 34 million years.
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.