Gliese 357 d
Planet· orbits Gliese 357
Gliese 357 d - a super-Earth (minimum mass ~6.1 Earth) orbiting in the habitable zone every 56 days, one of the nearer temperate planets known. RV-only: minimum mass, model-estimate size, so whether it is rocky or volatile-rich is unknown, and it has never been imaged.
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Key facts
Minimum mass
3.64 × 10²⁵ kg
6.1 M⊕
Year
55.66 Earth days
Distance from Gliese 357
0.204 AU
Science
Physical
- Minimum mass (m·sin i)
- 3.64 × 10²⁵ kg · 6.1 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 ~6.1-Earth-mass world; true size unknown.
Orbital
- Semi-major axis
- 0.204 AU
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Eccentricity
- 0
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Inclination
- 0.00 °
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Orbital period
- 55.7 days
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Perihelion
- 0.204 AU
- Computed from the orbital elements
- Aphelion
- 0.204 AU
- Computed from the orbital elements
- Mean orbital velocity
- 39.9 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- A super-Earth of minimum mass ~6.1 Earth orbiting in the habitable zone; whether it is rocky or volatile-rich is unknown, and it has never been 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
- 0.382 S⊕ · 38% of the sunlight Earth receives
- Computed from Gliese 357's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 220 K (-53 °C)
- Computed model value for its habitable-zone orbit — not measured; actual temperature depends on any atmosphere.
Discovery & history
- Method
- Radial-velocity detection (stellar wobble)
- Name
- Designated 'd' 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 2019 as the habitable-zone member of the system - a widely discussed nearby temperate super-Earth.
Images
Images from open archives · credit shown per image