GJ 251 c

GJ 251 c is a “Super-Earth” about 18.2 light-years away in the constellation Gemini. It orbits the red dwarf star Gliese 251.

Key Physical Characteristics

Planet Type: Rocky Super-Earth.
Mass: Roughly 2.2 times the mass of Earth.
Orbit: It orbits its star every 14.3 Earth days.
The Star: Gliese 251 is an old, stable red dwarf. It does not often release high-energy flares.

Habitability & Environment

GJ 251 c is a high-priority target for climate modeling:

Energy Intake: It receives about 90% of the starlight that Earth receives from the Sun. This puts it in a “temperate” zone, similar to Earth’s energy balance.
Temperature: The star’s stability makes it a good candidate for a stable atmosphere. This could allow for liquid water on the surface.
Tidal Locking: Like most planets orbiting close to a red dwarf, it is likely tidally locked.

Scientific Significance

Atmospheric Retention: Because the host star is older and less active, GJ 251 c may have an atmosphere that has not been stripped away by radiation.
Target for Study: At 18.2 light-years, it is close enough for future high-resolution spectroscopy to look for “biosignatures” like oxygen, nitrogen, and water vapor.

Published @ March 24, 2026 9:16 am