Exoplanet
GJ 3998 d
59.18 light-years
- Discovery
- Radial Velocity · 2025
- Radius
- 2.34 Earth radii
- Mass
- 6.07 (+1 / −0.96) Earth masses
- Orbital period
- 41.78 (+0.05 / −0.05) days
- Semi-major axis
- 0.189 (+6 × 10⁻³ / −6 × 10⁻³) AU
- Equilibrium temperature
- 292.23 (+16.23 / −16.23) K
- Mass provenance
- Msini
Measurements may come from different studies and need not form one self-consistent model. “Msini” is a minimum mass; a mass inferred from radius is an estimate. Equilibrium temperature is a model estimate, not a measured surface temperature or evidence of habitability.
NASA archive record and references ↗
Snapshot retrieved: 2026-10-11T04:15:07.688253+00:00