TRAPPIST-1 h
📋 A written introduction is coming — for now this page shows official values only.
Planet
- Host star
- TRAPPIST-1
- Distance from Earth
- 12.4299 pc (≈ 40.5 light-years)
- NASA planet type
- Terrestrial
- Radius (Earth = 1)
- 0.755
- Mass (Earth = 1)
- 0.326
- Orbital period
- 18.7729 days
- Semi-major axis
- 0.06189 AU
- Eccentricity
- 0.00567
- Equilibrium temperature
- 171.7 K
- Discovery method
- Transit
- Discovery year
- 2,017
- Discovery facility
- Multiple Observatories
- Host spectral type
- M8.0 V
- Host temperature
- 2,566 K
- Host radius (Sun = 1)
- 0.1192
- Host mass (Sun = 1)
- 0.0898
- Host brightness
- 17.02 mag
Source:NASA Exoplanet Archive (Caltech/IPAC) · checked 2026-11-02 ↗NASA Exoplanet Archive (Caltech/IPAC) · checked 2026-11-02 ↗NASA Science · checked 2026-11-02 ↗
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 0.8 times Earth's (NASA Exoplanet Archive).
- One orbit takes about 18.8 Earth days — that is this planet's year.
Worked out from this object's official values.