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.
Proxima Centauri System objects
3 objectsProxima CentauriStar
Proxima Centauri bPlanet
Proxima Centauri dPlanet
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 | Proxima Centauri | Proxima Centauri b |
|---|---|---|
| Mean radius | 98,093.7 km | ≈ 6,505.7 km |
| Diameter | ≈ 196,187.4 km | ≈ 13,011.3 km |
| Spherical approximate volume | ≈ 3.954E15 km3 | ≈ 1.153E12 km3 |
| Mass | 2.428E29 kg | 6.301E24 kg |
| Mean density | ≈ 61,407.688 kg/m³ | ≈ 5,460 kg/m³ |
| Surface gravity | ≈ 1,684.062 m/s² | ≈ 9.936 m/s² |
| Escape velocity | ≈ 574.8 km/s | ≈ 11.4 km/s |
| Rotation period | NaN | NaN |
| Orbital period | NaN | 11.185 d |
| Mean temperature | 2,900 K (2,626.9°C) | 218 K (-55.1°C) |
| Surface pressure | NaN | NaN |
| Orbital semi-major axis | NaN | 7,252,504.8 km |
Mean radius
- Proxima Centauri
- 98,093.7 km
- Proxima Centauri b
- ≈ 6,505.7 km
Diameter
- Proxima Centauri
- ≈ 196,187.4 km
- Proxima Centauri b
- ≈ 13,011.3 km
Spherical approximate volume
- Proxima Centauri
- ≈ 3.954E15 km3
- Proxima Centauri b
- ≈ 1.153E12 km3
Mass
- Proxima Centauri
- 2.428E29 kg
- Proxima Centauri b
- 6.301E24 kg
Mean density
- Proxima Centauri
- ≈ 61,407.688 kg/m³
- Proxima Centauri b
- ≈ 5,460 kg/m³
Surface gravity
- Proxima Centauri
- ≈ 1,684.062 m/s²
- Proxima Centauri b
- ≈ 9.936 m/s²
Escape velocity
- Proxima Centauri
- ≈ 574.8 km/s
- Proxima Centauri b
- ≈ 11.4 km/s
Rotation period
- Proxima Centauri
- NaN
- Proxima Centauri b
- NaN
Orbital period
- Proxima Centauri
- NaN
- Proxima Centauri b
- 11.185 d
Mean temperature
- Proxima Centauri
- 2,900 K (2,626.9°C)
- Proxima Centauri b
- 218 K (-55.1°C)
Surface pressure
- Proxima Centauri
- NaN
- Proxima Centauri b
- NaN
Orbital semi-major axis
- Proxima Centauri
- NaN
- Proxima Centauri b
- 7,252,504.8 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.