Exoplanet
Kepler-661 b
1,744.25 light-years
- Discovery
- Transit · 2016
- Radius
- 3.07 (+0.12 / −0.21) Earth radii
- Mass
- 9.64 Earth masses
- Orbital period
- 6.0293 (+5.362 × 10⁻⁶ / −5.362 × 10⁻⁶) days
- Semi-major axis
- 0.0585 AU
- Equilibrium temperature
- 678 K
- Mass provenance
- M-R relationship
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