At a Glance
Celestial Size Comparison
Choose the celestial objects you’re curious about. See at a glance how their sizes and environments compare.
Choose objects to compare
Choose at least 2 and no more than 4 celestial objects.
TRAPPIST-1 System objects
8 objectsTRAPPIST-1Star
TRAPPIST-1 bPlanet
TRAPPIST-1 cPlanet
TRAPPIST-1 dPlanet
TRAPPIST-1 ePlanet
TRAPPIST-1 fPlanet
TRAPPIST-1 gPlanet
TRAPPIST-1 hPlanet
Size Comparison
Shows objects at a scale close to their actual size ratio.
Environment Comparison
Compare the size and environment of each celestial object.
| Measurement | TRAPPIST-1 g | TRAPPIST-1 f |
|---|---|---|
| Mean radius | 7,200.9 km | 6,665.1 km |
| Diameter | ≈ 14,401.7 km | ≈ 13,330.2 km |
| Spherical approximate volume | ≈ 1.564E12 km3 | ≈ 1.24E12 km3 |
| Mass | 7.889E24 kg | 6.205E24 kg |
| Mean density | 5,055.986 kg/m³ | 5,022.904 kg/m³ |
| Surface gravity | ≈ 10.155 m/s² | ≈ 9.323 m/s² |
| Escape velocity | ≈ 12.1 km/s | ≈ 11.1 km/s |
| Rotation period | NaN | NaN |
| Orbital period | 12.352 d | 9.208 d |
| Mean temperature | 197.3 K (-75.8°C) | 217.7 K (-55.4°C) |
| Surface pressure | NaN | NaN |
| Orbital semi-major axis | 7,005,668.3 km | 5,758,022 km |
Mean radius
- TRAPPIST-1 g
- 7,200.9 km
- TRAPPIST-1 f
- 6,665.1 km
Diameter
- TRAPPIST-1 g
- ≈ 14,401.7 km
- TRAPPIST-1 f
- ≈ 13,330.2 km
Spherical approximate volume
- TRAPPIST-1 g
- ≈ 1.564E12 km3
- TRAPPIST-1 f
- ≈ 1.24E12 km3
Mass
- TRAPPIST-1 g
- 7.889E24 kg
- TRAPPIST-1 f
- 6.205E24 kg
Mean density
- TRAPPIST-1 g
- 5,055.986 kg/m³
- TRAPPIST-1 f
- 5,022.904 kg/m³
Surface gravity
- TRAPPIST-1 g
- ≈ 10.155 m/s²
- TRAPPIST-1 f
- ≈ 9.323 m/s²
Escape velocity
- TRAPPIST-1 g
- ≈ 12.1 km/s
- TRAPPIST-1 f
- ≈ 11.1 km/s
Rotation period
- TRAPPIST-1 g
- NaN
- TRAPPIST-1 f
- NaN
Orbital period
- TRAPPIST-1 g
- 12.352 d
- TRAPPIST-1 f
- 9.208 d
Mean temperature
- TRAPPIST-1 g
- 197.3 K (-75.8°C)
- TRAPPIST-1 f
- 217.7 K (-55.4°C)
Surface pressure
- TRAPPIST-1 g
- NaN
- TRAPPIST-1 f
- NaN
Orbital semi-major axis
- TRAPPIST-1 g
- 7,005,668.3 km
- TRAPPIST-1 f
- 5,758,022 km
This comparison is based on the most reliable observational data available. Celestial information may change with new research and observations, so please treat it as a general guide rather than a definitive source.