NGTS-30 b
NGTS-30 b is a cold gas giant orbiting NGTS-30 in the constellation Crater. It lies about 778 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is NGTS-30 b?
NGTS-30 b has a radius of 10.40 times that of Earth, or 0.93 times the radius of Jupiter. Its mass is 305 times that of Earth.
Is NGTS-30 b in the Habitable Zone?
NGTS-30 b orbits inside the inner edge of the habitable zone of NGTS-30. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of NGTS-30: 0.622–1.480 AU (conservative: 0.788–1.403 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Temperature on NGTS-30 b
The equilibrium temperature of NGTS-30 b is about 500 K (227 °C) — hotter than anywhere on Earth. 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-30 b — one full orbit around NGTS-30 — lasts 98.3 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.408 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.29).
How Was NGTS-30 b Discovered?
NGTS-30 b was discovered in 2024 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
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-30 b?
NGTS-30 b is 777.5 light-years (238.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1249. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 13,684,000 years to make the journey.
The Host Star: NGTS-30
NGTS-30
- Surface temperature
- 5,455 K (Sun: 5,772 K)
- Mass
- 0.94 M☉
- Radius
- 0.91 R☉
- Age
- 1.1 billion years (Sun: 4.6)
Planetary System
NGTS-30 b is the only planet known to orbit NGTS-30 so far.
NGTS-30 b — Complete Data
| Radius | 10.402 Earth radii (0.928 Jupiter radii) |
|---|---|
| Mass | 305.12 Earth masses (0.960 Jupiter masses) |
| Orbital period | 98.30 days |
| Orbital distance | 0.408 AU |
| Eccentricity | 0.294 |
| Equilibrium temperature | 500 K (227 °C) |
| Distance from Earth | 777.5 light-years (238.4 parsecs) |
| Constellation | Crater |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-04-15. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About NGTS-30 b
Is NGTS-30 b habitable?
No — NGTS-30 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is NGTS-30 b?
NGTS-30 b is about 778 light-years from Earth in the constellation Crater. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 13,684,000 years to get there.
How big is NGTS-30 b compared to Earth?
NGTS-30 b has 10.40 times the radius of Earth and about 305 times its mass.
How long is a year on NGTS-30 b?
One orbit around NGTS-30 takes 98.3 Earth days.
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