Gliese 687 c
Planet· orbits the Sun
Gliese 687 c - an outer Neptune-mass planet (minimum mass ~16 Earth) on a cold, eccentric two-year orbit. RV-only: minimum mass, model-estimate size, never imaged.
Open in 3D viewSee Gliese 687 c in the live, interactive 3D map
Key facts
Minimum mass
9.56 × 10²⁵ kg
16 M⊕
Year
728 Earth days
1.99 Earth years
Distance from Gliese 687
1.17 AU
Science
Physical
- Minimum mass (m·sin i)
- 9.56 × 10²⁵ kg · 16 M⊕
- Radius
- Not measured
Orbital
- Semi-major axis
- 1.17 AU
- Eccentricity
- 0.4
- Inclination
- 0.00 °
- Orbital period
- 1.99 years
- Perihelion
- 0.699 AU
- Aphelion
- 1.63 AU
- Mean orbital velocity
- 17.4 km/s
Composition
- Bulk composition
- A cold Neptune-class planet of minimum mass ~16 Earth on the outer, eccentric orbit; never imaged.
- Cloud appearance
- Appearance based on ESO/M. Kornmesser's artist's concept. No spacecraft has imaged this world, so its real appearance is unknown — The banded clouds shown are a representation of its class, shown only in Vision mode; Realism shows a plain spectral colour.
Radiation & temperature
- Insolation
- 0.0157 S⊕ · 2% of the sunlight Earth receives
- Equilibrium temperature
- 99 K (-174 °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').
Announced in 2020 as a second, more distant planet in the system.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.