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 b | TRAPPIST-1 c |
|---|---|---|
| Mean radius | 7,118 km | 6,996.8 km |
| Diameter | ≈ 14,235.9 km | ≈ 13,993.6 km |
| Spherical approximate volume | ≈ 1.511E12 km3 | ≈ 1.435E12 km3 |
| Mass | 8.206E24 kg | 7.812E24 kg |
| Mean density | 5,441.939 kg/m³ | 5,463.993 kg/m³ |
| Surface gravity | ≈ 10.81 m/s² | ≈ 10.65 m/s² |
| Escape velocity | ≈ 12.4 km/s | ≈ 12.2 km/s |
| Rotation period | NaN | NaN |
| Orbital period | 1.511 d | 2.422 d |
| Mean temperature | 397.6 K (124.5°C) | 339.7 K (66.6°C) |
| Surface pressure | NaN | NaN |
| Orbital semi-major axis | 1,726,359.4 km | 2,363,646.4 km |
Mean radius
- TRAPPIST-1 b
- 7,118 km
- TRAPPIST-1 c
- 6,996.8 km
Diameter
- TRAPPIST-1 b
- ≈ 14,235.9 km
- TRAPPIST-1 c
- ≈ 13,993.6 km
Spherical approximate volume
- TRAPPIST-1 b
- ≈ 1.511E12 km3
- TRAPPIST-1 c
- ≈ 1.435E12 km3
Mass
- TRAPPIST-1 b
- 8.206E24 kg
- TRAPPIST-1 c
- 7.812E24 kg
Mean density
- TRAPPIST-1 b
- 5,441.939 kg/m³
- TRAPPIST-1 c
- 5,463.993 kg/m³
Surface gravity
- TRAPPIST-1 b
- ≈ 10.81 m/s²
- TRAPPIST-1 c
- ≈ 10.65 m/s²
Escape velocity
- TRAPPIST-1 b
- ≈ 12.4 km/s
- TRAPPIST-1 c
- ≈ 12.2 km/s
Rotation period
- TRAPPIST-1 b
- NaN
- TRAPPIST-1 c
- NaN
Orbital period
- TRAPPIST-1 b
- 1.511 d
- TRAPPIST-1 c
- 2.422 d
Mean temperature
- TRAPPIST-1 b
- 397.6 K (124.5°C)
- TRAPPIST-1 c
- 339.7 K (66.6°C)
Surface pressure
- TRAPPIST-1 b
- NaN
- TRAPPIST-1 c
- NaN
Orbital semi-major axis
- TRAPPIST-1 b
- 1,726,359.4 km
- TRAPPIST-1 c
- 2,363,646.4 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.