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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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 b | Proxima Centauri d |
|---|---|---|
| Mean radius | ≈ 6,505.7 km | ≈ 4,413.6 km |
| Diameter | ≈ 13,011.3 km | ≈ 8,827.3 km |
| Spherical approximate volume | ≈ 1.153E12 km3 | ≈ 360,147,881,948 km3 |
| Mass | 6.301E24 kg | 1.553E24 kg |
| Mean density | ≈ 5,460 kg/m³ | ≈ 4,310 kg/m³ |
| Surface gravity | ≈ 9.936 m/s² | ≈ 5.32 m/s² |
| Escape velocity | ≈ 11.4 km/s | ≈ 6.9 km/s |
| Rotation period | NaN | NaN |
| Orbital period | 11.185 d | 5.123 d |
| Mean temperature | 218 K (-55.1°C) | 282 K (8.9°C) |
| Surface pressure | NaN | NaN |
| Orbital semi-major axis | 7,252,504.8 km | 4,309,914.7 km |
Mean radius
- Proxima Centauri b
- ≈ 6,505.7 km
- Proxima Centauri d
- ≈ 4,413.6 km
Diameter
- Proxima Centauri b
- ≈ 13,011.3 km
- Proxima Centauri d
- ≈ 8,827.3 km
Spherical approximate volume
- Proxima Centauri b
- ≈ 1.153E12 km3
- Proxima Centauri d
- ≈ 360,147,881,948 km3
Mass
- Proxima Centauri b
- 6.301E24 kg
- Proxima Centauri d
- 1.553E24 kg
Mean density
- Proxima Centauri b
- ≈ 5,460 kg/m³
- Proxima Centauri d
- ≈ 4,310 kg/m³
Surface gravity
- Proxima Centauri b
- ≈ 9.936 m/s²
- Proxima Centauri d
- ≈ 5.32 m/s²
Escape velocity
- Proxima Centauri b
- ≈ 11.4 km/s
- Proxima Centauri d
- ≈ 6.9 km/s
Rotation period
- Proxima Centauri b
- NaN
- Proxima Centauri d
- NaN
Orbital period
- Proxima Centauri b
- 11.185 d
- Proxima Centauri d
- 5.123 d
Mean temperature
- Proxima Centauri b
- 218 K (-55.1°C)
- Proxima Centauri d
- 282 K (8.9°C)
Surface pressure
- Proxima Centauri b
- NaN
- Proxima Centauri d
- NaN
Orbital semi-major axis
- Proxima Centauri b
- 7,252,504.8 km
- Proxima Centauri d
- 4,309,914.7 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.