Lacaille 9352 d
Planet· orbits Lacaille 9352
Lacaille 9352 d — the outermost of the four (minimum mass ~6.1 Earth) on a 50.8-day orbit, cool enough that it may lie near or beyond the temperate zone. Never imaged.
Open in 3D viewSee Lacaille 9352 d in the live, interactive 3D map
Key facts
Minimum mass
3.64 × 10²⁵ kg
6.1 M⊕
Year
50.77 Earth days
Distance from Lacaille 9352
0.212 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 — the radius is a model estimate; true size unknown.
Orbital
- Semi-major axis
- 0.212 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
- 50.8 days
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Perihelion
- 0.212 AU
- Computed from the orbital elements
- Aphelion
- 0.212 AU
- Computed from the orbital elements
- Mean orbital velocity
- 45.4 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- Cool sub-Neptune or super-Earth (minimum mass ~6.1 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
- 0.819 S⊕ · 82% of the sunlight Earth receives
- Computed from Lacaille 9352's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 241 K (-32 °C)
- Computed model value (no atmosphere assumed), the coolest of the four — not measured.
Discovery & history
- Method
- Radial-velocity detection (stellar wobble)
- Name
- Designated 'd' as the third planet found around its star, following the IAU convention of lettering planets in discovery order from 'b'.
Established in 2026 with planet e as the radial-velocity baseline lengthened, completing the four-planet family (Hartogh et al. 2026).
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.