Gliese 317 b
Planet· orbits the Sun
Gliese 317 b - a super-Jupiter (about 2.5 Jupiter masses) on a nearly two-year orbit around a red dwarf - an unusually massive planet for so small a star. Found from the star's wobble; it has never transited or been imaged, so its size is a model estimate and no density is quoted.
Open in 3D viewSee Gliese 317 b in the live, interactive 3D map
Key facts
Mass
4.74 × 10²⁷ kg
2.5 M♃ (795 M⊕)
Year
696 Earth days
1.90 Earth years
Distance from Gliese 317
1.14 AU
Science
Physical
- Mass
- 4.74 × 10²⁷ kg · 2.5 M♃ (795 M⊕)
- Radius
- Not measured
Orbital
- Semi-major axis
- 1.14 AU
- Eccentricity
- 0.083
- Inclination
- 0.00 °
- Orbital period
- 1.90 years
- Perihelion
- 1.04 AU
- Aphelion
- 1.23 AU
- Mean orbital velocity
- 17.8 km/s
Composition
- Bulk composition
- A super-Jupiter of about 2.5 Jupiter masses (a dynamical mass, shown plainly) — hydrogen and helium; unusually massive for so small a star, and 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
- 0.0159 S⊕ · 2% of the sunlight Earth receives
- Equilibrium temperature
- 100 K (-173 °C)
Discovery & history
- Method
- Radial-velocity detection (stellar wobble)
- Name
- Designated 'b' 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').
Discovered in 2007 from radial-velocity monitoring - one of the few giant planets known around a low-mass red dwarf.
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.