GJ 338 B b
📋 A written introduction is coming — for now this page shows official values only.
Planet
- Host star
- GJ 338 B
- Distance from Earth
- 6.3326 pc (≈ 20.7 light-years)
- NASA planet type
- Neptune-like
- Radius (Earth = 1)
- 3.25
- Mass (Earth = 1)
- 10.6
- Orbital period
- 24.422 days
- Semi-major axis
- 0.142 AU
- Eccentricity
- 0.109
- Equilibrium temperature
- 391 K
- Discovery method
- Radial Velocity
- Discovery year
- 2,020
- Discovery facility
- Calar Alto Observatory
- Host spectral type
- M0 V
- Host temperature
- 4,014 K
- Host radius (Sun = 1)
- 0.58
- Host mass (Sun = 1)
- 0.64
- Host brightness
- 7.7 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 ↗
In everyday life
- Light from this object takes about 21 years to reach Earth — the light you see tonight left around AD 2005 (official distance ÷ speed of light).
- Its radius is about 3.3 times Earth's (NASA Exoplanet Archive).
- One orbit takes about 24.4 Earth days — that is this planet's year.
Worked out from this object's official values.