GJ 3323 c
Planet· orbits GJ 3323
GJ 3323 c - a cooler outer super-Earth (minimum mass ~2.3 Earth) on a 41-day orbit. RV-only: minimum mass, model-estimate size, never imaged.
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Key facts
Minimum mass
1.38 × 10²⁵ kg
2.31 M⊕
Year
40.54 Earth days
Distance from GJ 3323
0.126 AU
Science
Physical
- Minimum mass (m·sin i)
- 1.38 × 10²⁵ kg · 2.31 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 a ~2.3-Earth-mass world; true size unknown.
Orbital
- Semi-major axis
- 0.126 AU
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Eccentricity
- 0.17
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Orbital period
- 40.5 days
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Perihelion
- 0.105 AU
- Computed from the orbital elements
- Aphelion
- 0.148 AU
- Computed from the orbital elements
- Mean orbital velocity
- 33.9 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- A cooler outer super-Earth of minimum mass ~2.3 Earth; 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 Visual mode; Realism shows a plain spectral colour.
Radiation & temperature
- Insolation
- 0.169 S⊕ · 17% of the sunlight Earth receives
- Computed from GJ 3323's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 148 K (-125 °C)
- Computed model value for its cool 41-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 two planets announced in 2017 around this nearby red dwarf.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.