Gliese 682 c
Planet· orbits Gliese 682
Gliese 682 c - an outer mini-Neptune (minimum mass ~8.7 Earth) on a 57-day orbit. RV-only: minimum mass, model-estimate size, never imaged.
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Key facts
Minimum mass
5.20 × 10²⁵ kg
8.7 M⊕
Year
57.32 Earth days
Distance from Gliese 682
0.176 AU
Science
Physical
- Minimum mass (m·sin i)
- 5.20 × 10²⁵ kg · 8.7 M⊕
- Radial-velocity detection measures m·sin i; the true mass depends on the unknown orbital inclination.
- Radius
- Not measured
- No transit — radius is a model estimate for an ~8.7-Earth-mass world; no density is quoted.
Orbital
- Semi-major axis
- 0.176 AU
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Eccentricity
- 0.1
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Orbital period
- 57.3 days
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Perihelion
- 0.158 AU
- Computed from the orbital elements
- Aphelion
- 0.194 AU
- Computed from the orbital elements
- Mean orbital velocity
- 33.4 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- An outer mini-Neptune of minimum mass ~8.7 Earth; 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 Visual mode; Realism shows a plain spectral colour.
Radiation & temperature
- Insolation
- 0.0646 S⊕ · 6% of the sunlight Earth receives
- Computed from Gliese 682's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 190 K (-83 °C)
- Computed model value for its 57-day orbit — not measured.
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').
The outer of the two planets reported in 2014 around this nearby red dwarf.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.