GJ 229 b
📋 A written introduction is coming — for now this page shows official values only.
Planet
- Host star
- GJ 229
- Distance from Earth
- 5.7562 pc (≈ 18.8 light-years)
- NASA planet type
- Neptune-like
- Radius (Earth = 1)
- 3.97
- Mass (Earth = 1)
- 14.9379
- Orbital period
- 579.475 days
- Semi-major axis
- 1.086 AU
- Eccentricity
- 0.404
- Equilibrium temperature
- 111.85 K
- Discovery method
- Radial Velocity
- Discovery year
- 2,014
- Discovery facility
- Multiple Observatories
- Host spectral type
- M1.5V
- Host temperature
- 3,564 K
- Host radius (Sun = 1)
- 0.46
- Host mass (Sun = 1)
- 0.509
- Host brightness
- 8.15 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 19 years to reach Earth — the light you see tonight left around AD 2007 (official distance ÷ speed of light).
- Its radius is about 4 times Earth's (NASA Exoplanet Archive).
- One orbit takes about 579.5 Earth days (about 1.6 years) — that is this planet's year.
Worked out from this object's official values.