TRAPPIST-1 d
A confirmed exoplanet orbiting TRAPPIST-1.
Compared with Earth
- Size
- About 79% of Earth's width.
- Mass
- About 39% of Earth's mass.
- Starlight
- About 1.1 times the starlight Earth gets from the Sun.
- Year
- A year here lasts about 4 Earth days.
Planet
- Radius
- 0.788 × Earth
- Mass
- 0.388 × Earth
- Density
- 4.367 g/cm³
- Equilibrium temperature
- Unknown
- Starlight received
- 1.115 × Earth
- Orbital period
- 4.049 days
- Average distance from its star
- 0.02227 AU
Star
- Host star
- TRAPPIST-1
- Spectral class
- M — red dwarf
- Surface temperature
- 2,566 K
- Radius
- 0.1192 × Sun
- Mass
- 0.0898 × Sun
- Age
- Unknown
System
- Distance from Earth
- Unknown
- Stars in system
- 1
- Known planets
- 7
Discovery
- Year
- 2016
- Method
- Transit
- Facility
- La Silla Observatory
Data from the NASA Exoplanet Archive, synced October 14, 2026.