NGTS-10 b
NGTS-10 b is a hot Jupiter orbiting the K5 V star NGTS-10 in the constellation Lepus. It was discovered in 2020 using the transit method.
How Big Is NGTS-10 b?
NGTS-10 b has a radius of 13.51 times that of Earth, or 1.21 times the radius of Jupiter. Its mass is 687 times that of Earth, giving it a density of 1.43 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is NGTS-10 b in the Habitable Zone?
NGTS-10 b orbits inside the inner edge of the habitable zone of NGTS-10. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of NGTS-10: 0.352–0.866 AU (conservative: 0.446–0.821 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-10 b
The equilibrium temperature of NGTS-10 b is about 1,332 K (1,059 °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-10 b — one full orbit around NGTS-10 — lasts just 18.4 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.014 AU — closer to its star than Mercury is to the Sun.
How Was NGTS-10 b Discovered?
NGTS-10 b was discovered in 2020 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.
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-10 b scores 0.07, ranking #4,984 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: NGTS-10
NGTS-10
- Spectral type
- K5 V
- Surface temperature
- 4,600 K (Sun: 5,772 K)
- Mass
- 0.70 M☉
- Radius
- 0.70 R☉
- Age
- 10.4 billion years (Sun: 4.6)
Planetary System
NGTS-10 b is the only planet known to orbit NGTS-10 so far.
NGTS-10 b — Complete Data
| Radius | 13.507 Earth radii (1.205 Jupiter radii) |
|---|---|
| Mass | 687.15 Earth masses (2.162 Jupiter masses) |
| Density | 1.43 g/cm³ (Earth: 5.51) |
| Orbital period | 0.77 days |
| Orbital distance | 0.014 AU |
| Equilibrium temperature | 1,332 K (1,059 °C) |
| Earth Similarity Index | 0.07 |
| Constellation | Lepus |
| Discovery method | Transit |
| Discovery facility | Next-Generation Transit Survey (NGTS) |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2020-03-13. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About NGTS-10 b
Is NGTS-10 b habitable?
No — NGTS-10 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How big is NGTS-10 b compared to Earth?
NGTS-10 b has 13.51 times the radius of Earth and about 687 times its mass.
How long is a year on NGTS-10 b?
One orbit around NGTS-10 takes 0.8 Earth days — short enough that 476 of its years would fit into one Earth year.
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