NGTS-35 b
NGTS-35 b is a cold gas giant orbiting the K3.5 V star NGTS-35 in the constellation Hydra. It lies about 597 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is NGTS-35 b?
NGTS-35 b has a radius of 10.90 times that of Earth, or 0.97 times the radius of Jupiter. Its mass is 152 times that of Earth.
Is NGTS-35 b in the Habitable Zone?
NGTS-35 b orbits inside the inner edge of the habitable zone of NGTS-35. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of NGTS-35: 0.399–0.976 AU (conservative: 0.505–0.925 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on NGTS-35 b
The equilibrium temperature of NGTS-35 b is about 451 K (178 °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-35 b — one full orbit around NGTS-35 — lasts 25.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.160 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.19).
How Was NGTS-35 b Discovered?
NGTS-35 b was discovered in 2025 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-35 b?
NGTS-35 b is 597.1 light-years (183.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1429. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,508,960 years to make the journey.
The Host Star: NGTS-35
NGTS-35
- Spectral type
- K3.5 V
- Surface temperature
- 4,717 K (Sun: 5,772 K)
- Mass
- 0.79 M☉
- Radius
- 0.75 R☉
- Luminosity
- 0.2530 L☉
- Age
- 1.5 billion years (Sun: 4.6)
Planetary System
NGTS-35 b is the only planet known to orbit NGTS-35 so far.
NGTS-35 b — Complete Data
| Radius | 10.900 Earth radii (0.972 Jupiter radii) |
|---|---|
| Mass | 152.00 Earth masses (0.478 Jupiter masses) |
| Orbital period | 25.24 days |
| Orbital distance | 0.160 AU |
| Eccentricity | 0.192 |
| Equilibrium temperature | 451 K (178 °C) |
| Distance from Earth | 597.1 light-years (183.1 parsecs) |
| Constellation | Hydra |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2026-01-15. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About NGTS-35 b
Is NGTS-35 b habitable?
No — NGTS-35 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is NGTS-35 b?
NGTS-35 b is about 597 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,508,960 years to get there.
How big is NGTS-35 b compared to Earth?
NGTS-35 b has 10.90 times the radius of Earth and about 152 times its mass.
How long is a year on NGTS-35 b?
One orbit around NGTS-35 takes 25.2 Earth days — short enough that 14 of its years would fit into one Earth year.
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