NGTS-14 A b
NGTS-14 A b is a Neptune-like planet orbiting the K1 V star NGTS-14 A in the constellation Grus. It lies about 1,051 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is NGTS-14 A b?
NGTS-14 A b has a radius of 4.98 times that of Earth. Its mass is 29.2 times that of Earth, giving it a density of 1.40 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is NGTS-14 A b in the Habitable Zone?
NGTS-14 A b orbits inside the inner edge of the habitable zone of NGTS-14 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of NGTS-14 A: 0.527–1.264 AU (conservative: 0.667–1.198 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on NGTS-14 A b
The equilibrium temperature of NGTS-14 A b is about 1,143 K (870 °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-14 A b — one full orbit around NGTS-14 A — lasts 3.54 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.040 AU — closer to its star than Mercury is to the Sun.
How Was NGTS-14 A b Discovered?
NGTS-14 A b was discovered in 2021 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-14 A b?
NGTS-14 A b is 1,050.7 light-years (322.1 parsecs) from Earth. Light arriving here tonight left the planet about 1,051 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 18,492,320 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-14 A b scores 0.15, ranking #4,188 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: NGTS-14 A
NGTS-14 A b belongs to a system of 2 stars; it orbits NGTS-14 A.
NGTS-14 A
- Spectral type
- K1 V
- Surface temperature
- 5,187 K (Sun: 5,772 K)
- Mass
- 0.90 M☉
- Radius
- 0.84 R☉
- Age
- 5.9 billion years (Sun: 4.6)
Planetary System
NGTS-14 A b is the only planet known to orbit NGTS-14 A so far.
NGTS-14 A b — Complete Data
| Radius | 4.977 Earth radii (0.444 Jupiter radii) |
|---|---|
| Mass | 29.24 Earth masses (0.092 Jupiter masses) |
| Density | 1.40 g/cm³ (Earth: 5.51) |
| Orbital period | 3.54 days |
| Orbital distance | 0.040 AU |
| Equilibrium temperature | 1,143 K (870 °C) |
| Earth Similarity Index | 0.15 |
| Distance from Earth | 1,050.7 light-years (322.1 parsecs) |
| Constellation | Grus |
| Discovery method | Transit |
| Discovery facility | Next-Generation Transit Survey (NGTS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-02-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About NGTS-14 A b
Is NGTS-14 A b habitable?
No — NGTS-14 A b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is NGTS-14 A b?
NGTS-14 A b is about 1,051 light-years from Earth in the constellation Grus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 18,492,320 years to get there.
How big is NGTS-14 A b compared to Earth?
NGTS-14 A b has 4.98 times the radius of Earth and about 29.2 times its mass.
How long is a year on NGTS-14 A b?
One orbit around NGTS-14 A takes 3.5 Earth days — short enough that 103 of its years would fit into one Earth year.
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