G 268-110 b
G 268-110 b is a terrestrial planet orbiting the M5.0 V star G 268-110 in the constellation Cetus. It was discovered in 2025 using the radial velocity method.
Is G 268-110 b in the Habitable Zone?
The position of G 268-110 b relative to the habitable zone of G 268-110 cannot be precisely determined from the available orbital data.
Temperature on G 268-110 b
The equilibrium temperature of G 268-110 b is about 534 K (261 °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. It receives 13.57 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on G 268-110 b — one full orbit around G 268-110 — lasts just 34.4 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.013 AU — closer to its star than Mercury is to the Sun.
How Was G 268-110 b Discovered?
G 268-110 b was discovered in 2025 using the radial velocity method, with observations from Calar Alto 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.
The Host Star: G 268-110
G 268-110
- Spectral type
- M5.0 V
- Mass
- 0.14 M☉
Planetary System
G 268-110 b is the only planet known to orbit G 268-110 so far.
G 268-110 b — Complete Data
| Mass (best estimate) | 1.52 Earth masses |
|---|---|
| Orbital period | 1.43 days |
| Orbital distance | 0.013 AU |
| Equilibrium temperature | 534 K (261 °C) |
| Stellar irradiation | 13.57× Earth |
| Constellation | Cetus |
| Discovery method | Radial Velocity |
| Discovery facility | Calar Alto Observatory |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-04-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About G 268-110 b
Is G 268-110 b habitable?
G 268-110 b is not known to orbit within the habitable zone of G 268-110, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How long is a year on G 268-110 b?
One orbit around G 268-110 takes 1.4 Earth days — short enough that 255 of its years would fit into one Earth year.
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