GJ 4274 b
GJ 4274 b is a super-Earth orbiting the M4.5 V star GJ 4274 in the constellation Aquarius. It lies about 24 light-years from Earth and was discovered in 2026 using the radial velocity method.
Is GJ 4274 b in the Habitable Zone?
GJ 4274 b orbits inside the inner edge of the habitable zone of GJ 4274. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of GJ 4274: 0.048–0.127 AU (conservative: 0.061–0.120 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on GJ 4274 b
GJ 4274 b receives 14.70 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on GJ 4274 b — one full orbit around GJ 4274 — lasts just 39.2 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.015 AU — closer to its star than Mercury is to the Sun.
How Was GJ 4274 b Discovered?
GJ 4274 b was discovered in 2026 using the radial velocity method, with observations from Mauna Kea Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is GJ 4274 b?
GJ 4274 b is 23.6 light-years (7.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 2003. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 415,360 years to make the journey.
The Host Star: GJ 4274
GJ 4274
- Spectral type
- M4.5 V
- Surface temperature
- 3,228 K (Sun: 5,772 K)
- Mass
- 0.18 M☉
- Radius
- 0.19 R☉
- Luminosity
- 0.0035 L☉
- Age
- 0.1 billion years (Sun: 4.6)
The GJ 4274 Planetary System
GJ 4274 b is one of 2 known planets in the GJ 4274 system. Its siblings:
- GJ 4274 c (Super Earth)
GJ 4274 b — Complete Data
| Mass (best estimate) | 2.97 Earth masses |
|---|---|
| Orbital period | 1.63 days |
| Orbital distance | 0.015 AU |
| Stellar irradiation | 14.70× Earth |
| Distance from Earth | 23.6 light-years (7.2 parsecs) |
| Constellation | Aquarius |
| Discovery method | Radial Velocity |
| Discovery facility | Mauna Kea Observatory |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-02-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About GJ 4274 b
Is GJ 4274 b habitable?
No — GJ 4274 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is GJ 4274 b?
GJ 4274 b is about 24 light-years from Earth in the constellation Aquarius. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 415,360 years to get there.
How long is a year on GJ 4274 b?
One orbit around GJ 4274 takes 1.6 Earth days — short enough that 224 of its years would fit into one Earth year.
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