Exoplanet Janssen
Janssen is an exoplanet in the Copernicus (55 Cancri A ) system, a K-class star 40.9 light years away in the constellation Cancer.
| Exoplanet name: | Janssen |
| Detection method: | radial velocity |
| Distance: | 40.9 light-years |
| Mass (Earth ratio): | 0.02542 |
| Radius (Earth ratio): | 0.17 |
| Period: | 0.736539 days |
| Host star: | Copernicus |
| Star designation: | 55 Cancri A |
| Star magnitude: | 13.5 |
| Spectral class: | K |
| Star mass (Sun ratio): | 0.91 |
| Star temperature: | 5196 K |
| Constellation: | Cancer |