NGTS-33 b
NGTS-33 b is a hot Jupiter orbiting NGTS-33 in the constellation Puppis. It lies about 1,428 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is NGTS-33 b?
NGTS-33 b has a radius of 18.38 times that of Earth, or 1.64 times the radius of Jupiter. Its mass is 1,154 times that of Earth, giving it a density of 0.19 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is NGTS-33 b in the Habitable Zone?
The position of NGTS-33 b relative to the habitable zone of NGTS-33 cannot be precisely determined from the available orbital data.
Temperature on NGTS-33 b
The equilibrium temperature of NGTS-33 b is about 1,991 K (1,718 °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. It receives 2,620 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on NGTS-33 b — one full orbit around NGTS-33 — lasts 2.83 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-33 b Discovered?
NGTS-33 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-33 b?
NGTS-33 b is 1,428.1 light-years (437.9 parsecs) from Earth. Light arriving here tonight left the planet about 1,428 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 25,134,560 years to make the journey.
The Host Star: NGTS-33
NGTS-33
- Surface temperature
- 7,437 K (Sun: 5,772 K)
- Mass
- 1.60 M☉
- Radius
- 1.47 R☉
- Luminosity
- 5.9100 L☉
- Age
- 0.0 billion years (Sun: 4.6)
Planetary System
NGTS-33 b is the only planet known to orbit NGTS-33 so far.
NGTS-33 b — Complete Data
| Radius | 18.383 Earth radii (1.640 Jupiter radii) |
|---|---|
| Mass | 1,153.72 Earth masses (3.630 Jupiter masses) |
| Density | 0.19 g/cm³ (Earth: 5.51) |
| Orbital period | 2.83 days |
| Orbital distance | 0.048 AU |
| Equilibrium temperature | 1,991 K (1,718 °C) |
| Stellar irradiation | 2,620.00× Earth |
| Distance from Earth | 1,428.1 light-years (437.9 parsecs) |
| Constellation | Puppis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-12-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About NGTS-33 b
Is NGTS-33 b habitable?
NGTS-33 b is not known to orbit within the habitable zone of NGTS-33, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is NGTS-33 b?
NGTS-33 b is about 1,428 light-years from Earth in the constellation Puppis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 25,134,560 years to get there.
How big is NGTS-33 b compared to Earth?
NGTS-33 b has 18.38 times the radius of Earth and about 1,154 times its mass.
How long is a year on NGTS-33 b?
One orbit around NGTS-33 takes 2.8 Earth days — short enough that 129 of its years would fit into one Earth year.
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