NGTS-24 b
NGTS-24 b is a hot Jupiter orbiting the G2 IV star NGTS-24 in the constellation Centaurus. It lies about 2,228 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is NGTS-24 b?
NGTS-24 b has a radius of 13.61 times that of Earth, or 1.21 times the radius of Jupiter. Its mass is 165 times that of Earth.
Is NGTS-24 b in the Habitable Zone?
NGTS-24 b orbits inside the inner edge of the habitable zone of NGTS-24. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of NGTS-24: 1.251–2.944 AU (conservative: 1.584–2.791 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on NGTS-24 b
The equilibrium temperature of NGTS-24 b is about 1,499 K (1,226 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on NGTS-24 b — one full orbit around NGTS-24 — lasts 3.47 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.048 AU — closer to its star than Mercury is to the Sun.
How Was NGTS-24 b Discovered?
NGTS-24 b was discovered in 2022 using the transit method, with observations from Next-Generation Transit Survey (NGTS).
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is NGTS-24 b?
NGTS-24 b is 2,227.8 light-years (683.1 parsecs) from Earth. Light arriving here tonight left the planet about 2,228 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 39,209,280 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. NGTS-24 b scores 0.07, ranking #5,006 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: NGTS-24
NGTS-24
- Spectral type
- G2 IV
- Surface temperature
- 5,820 K (Sun: 5,772 K)
- Mass
- 1.26 M☉
- Radius
- 1.64 R☉
- Luminosity
- 2.7920 L☉
- Age
- 4.8 billion years (Sun: 4.6)
Planetary System
NGTS-24 b is the only planet known to orbit NGTS-24 so far.
NGTS-24 b — Complete Data
| Radius | 13.608 Earth radii (1.214 Jupiter radii) |
|---|---|
| Mass | 165.27 Earth masses (0.520 Jupiter masses) |
| Orbital period | 3.47 days |
| Orbital distance | 0.048 AU |
| Equilibrium temperature | 1,499 K (1,226 °C) |
| Earth Similarity Index | 0.07 |
| Distance from Earth | 2,227.8 light-years (683.1 parsecs) |
| Constellation | Centaurus |
| Discovery method | Transit |
| Discovery facility | Next-Generation Transit Survey (NGTS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-11-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About NGTS-24 b
Is NGTS-24 b habitable?
No — NGTS-24 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is NGTS-24 b?
NGTS-24 b is about 2,228 light-years from Earth in the constellation Centaurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 39,209,280 years to get there.
How big is NGTS-24 b compared to Earth?
NGTS-24 b has 13.61 times the radius of Earth and about 165 times its mass.
How long is a year on NGTS-24 b?
One orbit around NGTS-24 takes 3.5 Earth days — short enough that 105 of its years would fit into one Earth year.
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