Janssen
55 Cnc e
IAU name «Janssen» — Netherlands, 2015 contest
📋 A written introduction is coming — for now this page shows official values only.
Planet
- Host star
- 55 Cnc
- Distance from Earth
- 12.5855 pc (≈ 41 light-years)
- NASA planet type
- Super Earth
- Radius (Earth = 1)
- 1.875
- Mass (Earth = 1)
- 7.99
- Orbital period
- 0.736547 days
- Semi-major axis
- 0.01544 AU
- Eccentricity
- 0.05
- Equilibrium temperature
- 1,958 K
- Discovery method
- Radial Velocity
- Discovery year
- 2,004
- Discovery facility
- McDonald Observatory
- Host spectral type
- G8 V
- Host temperature
- 5,172 K
- Host radius (Sun = 1)
- 0.943
- Host mass (Sun = 1)
- 0.905
- Host brightness
- 5.9508 mag
Source:NASA Exoplanet Archive (Caltech/IPAC) · checked 2026-11-02 ↗NASA Science · checked 2026-11-02 ↗NASA Exoplanet Archive (Caltech/IPAC) · checked 2026-11-02 ↗
Related
Host star
In everyday life
- Light from this object takes about 41 years to reach Earth — the light you see tonight left around AD 1985 (official distance ÷ speed of light).
- Its radius is about 1.9 times Earth's (NASA Exoplanet Archive).
- One orbit takes about 17.7 hours — more than 1.4 orbits a day.
Worked out from this object's official values.