Lacaille 9352 e
Planet· orbits Lacaille 9352
Lacaille 9352 e — the innermost and hottest of the four (equilibrium temperature ~544 K), a scorching Earth-mass planet on a 4.4-day orbit. Its minimum mass is ~1.5 Earth (M·sin i, a lower limit — the true mass may be higher). Never imaged.
Open in 3D viewSee Lacaille 9352 e in the live, interactive 3D map
Key facts
Minimum mass
8.72 × 10²⁴ kg
1.46 M⊕
Year
4.42 Earth days
Distance from Lacaille 9352
6,238,231 km
Science
Physical
- Minimum mass (m·sin i)
- 8.72 × 10²⁴ kg · 1.46 M⊕
- Radial-velocity detection measures m·sin i; the true mass depends on the unknown orbital inclination. Value: Hartogh et al. 2026.
- Radius
- Not measured
- No transit — the radius is a model estimate; true size unknown.
Orbital
- Semi-major axis
- 6,238,231 km
- 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
- 4.4 days
- From the NASA Exoplanet Archive (radial-velocity orbit)
- Perihelion
- 6,238,231 km
- Computed from the orbital elements
- Aphelion
- 6,238,231 km
- Computed from the orbital elements
- Mean orbital velocity
- 103 km/s
- Computed from the orbital elements
Composition
- Bulk composition
- An Earth-mass planet — minimum mass ~1.5 Earth (M·sin i, a lower limit); presumed rocky, scorching and 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
- 21.2 S⊕ · 21.2× the sunlight Earth receives
- Computed from Lacaille 9352's luminosity and the orbital distance (inverse-square; Earth's sunlight = 1).
- Equilibrium temperature
- 544 K (271 °C)
- Computed model value (no atmosphere assumed), the hottest of the four — not measured.
Discovery & history
- Method
- Radial-velocity detection (stellar wobble)
- Name
- Designated 'e' as the fourth planet found around its star, following the IAU convention of lettering planets in discovery order from 'b'.
Established in 2026 as continued radial-velocity monitoring resolved two more signals in the Lacaille 9352 system, bringing its confirmed count to four (Hartogh et al. 2026).
Images
No official imagery available — this object has never been visited and no officially-licensed depiction exists.