At a Glance
Celestial Size Comparison
Choose the celestial objects you’re curious about. See at a glance how their sizes and environments compare.
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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 d | TRAPPIST-1 h |
|---|---|---|
| Mean radius | 5,025.9 km | 4,815.5 km |
| Diameter | ≈ 10,051.9 km | ≈ 9,630.9 km |
| Spherical approximate volume | ≈ 531,791,307,376 km3 | ≈ 467,738,842,439 km3 |
| Mass | 2.317E24 kg | 1.947E24 kg |
| Mean density | 4,366.784 kg/m³ | 4,162.78 kg/m³ |
| Surface gravity | ≈ 6.123 m/s² | ≈ 5.604 m/s² |
| Escape velocity | ≈ 7.8 km/s | ≈ 7.3 km/s |
| Rotation period | NaN | NaN |
| Orbital period | 4.049 d | 18.773 d |
| Mean temperature | 286.2 K (13.1°C) | 171.7 K (-101.4°C) |
| Surface pressure | NaN | NaN |
| Orbital semi-major axis | 3,331,544.6 km | 9,258,612.2 km |
Mean radius
- TRAPPIST-1 d
- 5,025.9 km
- TRAPPIST-1 h
- 4,815.5 km
Diameter
- TRAPPIST-1 d
- ≈ 10,051.9 km
- TRAPPIST-1 h
- ≈ 9,630.9 km
Spherical approximate volume
- TRAPPIST-1 d
- ≈ 531,791,307,376 km3
- TRAPPIST-1 h
- ≈ 467,738,842,439 km3
Mass
- TRAPPIST-1 d
- 2.317E24 kg
- TRAPPIST-1 h
- 1.947E24 kg
Mean density
- TRAPPIST-1 d
- 4,366.784 kg/m³
- TRAPPIST-1 h
- 4,162.78 kg/m³
Surface gravity
- TRAPPIST-1 d
- ≈ 6.123 m/s²
- TRAPPIST-1 h
- ≈ 5.604 m/s²
Escape velocity
- TRAPPIST-1 d
- ≈ 7.8 km/s
- TRAPPIST-1 h
- ≈ 7.3 km/s
Rotation period
- TRAPPIST-1 d
- NaN
- TRAPPIST-1 h
- NaN
Orbital period
- TRAPPIST-1 d
- 4.049 d
- TRAPPIST-1 h
- 18.773 d
Mean temperature
- TRAPPIST-1 d
- 286.2 K (13.1°C)
- TRAPPIST-1 h
- 171.7 K (-101.4°C)
Surface pressure
- TRAPPIST-1 d
- NaN
- TRAPPIST-1 h
- NaN
Orbital semi-major axis
- TRAPPIST-1 d
- 3,331,544.6 km
- TRAPPIST-1 h
- 9,258,612.2 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.