55 Cancri B
Listed as 55 Cnc B in the NASA Exoplanet Archive.
55 Cancri B is an M4.5 V star 40.7 light years away with 2 known planets. They were all found in 2025. It has a companion star.
Open in 3DPlanets
| Planet | Orbital period | Distance from star | Radius (Earths) | Mass (Earths) | Found | Method |
|---|---|---|---|---|---|---|
| 55 Cnc B b | 6.799 days | 0.044 AU | at least 3.5 | 2025 | Radial Velocity | |
| 55 Cnc B c | 33.75 days | 0.13 AU | at least 5.3 | 2025 | Radial Velocity |
"At least" is a minimum mass. Radial velocity can only measure mass times the sine of the orbit's tilt.
Star
- Spectral type M4.5 V
- 3,286 K surface temperature
- 0.26 times the mass of the Sun
- 0.274 times the radius of the Sun
Data from the NASA Exoplanet Archive, as of October 3, 2026. In the 3D view sizes and distances are compressed and every orbit is drawn in the same plane. Where each planet sits along its orbit is made up.