NGTS-25 b
NGTS-25 b is a hot Jupiter orbiting the K0 V star NGTS-25 in the constellation Microscopium. It lies about 1,700 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is NGTS-25 b?
NGTS-25 b has a radius of 11.47 times that of Earth, or 1.02 times the radius of Jupiter. Its mass is 203 times that of Earth.
Is NGTS-25 b in the Habitable Zone?
NGTS-25 b orbits inside the inner edge of the habitable zone of NGTS-25. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of NGTS-25: 0.551–1.316 AU (conservative: 0.698–1.248 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on NGTS-25 b
The equilibrium temperature of NGTS-25 b is about 1,101 K (828 °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-25 b — one full orbit around NGTS-25 — lasts 2.82 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.039 AU — closer to its star than Mercury is to the Sun.
How Was NGTS-25 b Discovered?
NGTS-25 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-25 b?
NGTS-25 b is 1,700.0 light-years (521.2 parsecs) from Earth. Light arriving here tonight left the planet about 1,700 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 29,920,000 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-25 b scores 0.08, ranking #4,666 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: NGTS-25
NGTS-25
- Spectral type
- K0 V
- Surface temperature
- 5,321 K (Sun: 5,772 K)
- Mass
- 0.91 M☉
- Radius
- 0.86 R☉
- Luminosity
- 0.5110 L☉
- Age
- 3.5 billion years (Sun: 4.6)
Planetary System
NGTS-25 b is the only planet known to orbit NGTS-25 so far.
NGTS-25 b — Complete Data
| Radius | 11.467 Earth radii (1.023 Jupiter radii) |
|---|---|
| Mass | 203.09 Earth masses (0.639 Jupiter masses) |
| Orbital period | 2.82 days |
| Orbital distance | 0.039 AU |
| Equilibrium temperature | 1,101 K (828 °C) |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 1,700.0 light-years (521.2 parsecs) |
| Constellation | Microscopium |
| Discovery method | Transit |
| Discovery facility | Next-Generation Transit Survey (NGTS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2023-01-04. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About NGTS-25 b
Is NGTS-25 b habitable?
No — NGTS-25 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is NGTS-25 b?
NGTS-25 b is about 1,700 light-years from Earth in the constellation Microscopium. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 29,920,000 years to get there.
How big is NGTS-25 b compared to Earth?
NGTS-25 b has 11.47 times the radius of Earth and about 203 times its mass.
How long is a year on NGTS-25 b?
One orbit around NGTS-25 takes 2.8 Earth days — short enough that 129 of its years would fit into one Earth year.
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