Gliese 251 c
Planet· orbits the Sun
Gliese 251 c - a cooler outer super-Earth (minimum mass ~3.9 Earth) on a 54-day orbit. RV-only: minimum mass, model-estimate size, never imaged.
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Key facts
Minimum mass
2.32 × 10²⁵ kg
3.88 M⊕
Year
53.65 Earth days
Distance from Gliese 251
0.196 AU
Science
Physical
- Minimum mass (m·sin i)
- 2.32 × 10²⁵ kg · 3.88 M⊕
- Radius
- Not measured
Orbital
- Semi-major axis
- 0.196 AU
- Eccentricity
- 0
- Inclination
- 0.00 °
- Orbital period
- 53.6 days
- Perihelion
- 0.196 AU
- Aphelion
- 0.196 AU
- Mean orbital velocity
- 39.7 km/s
Composition
- Bulk composition
- A cooler outer super-Earth of minimum mass ~3.9 Earth, confirmed in 2025; never imaged.
- Surface appearance
- Appearance based on ESO/M. Kornmesser's artist's concept. No spacecraft has imaged this world, so its real appearance is unknown — The surface shown is an artistic representation, shown only in Vision mode; Realism shows a plain spectral colour.
Radiation & temperature
- Insolation
- 0.403 S⊕ · 40% of the sunlight Earth receives
- Equilibrium temperature
- 216 K (-57 °C)
Discovery & history
- Method
- Radial-velocity detection (stellar wobble)
- Name
- Designated 'c' under the IAU convention that letters a star's planets 'b', 'c', 'd'... in the order they are discovered (the star itself is the unwritten 'a').
Confirmed in 2025 as a second planet from extended radial-velocity data.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.