Astronomical evidence
Proxima Cen b orbits Proxima Cen. The saved catalog gives an orbital period of 11.18465 ± 0.00053 days. Its discovery method is recorded as radial velocity. These quantities describe the real astronomical setting behind the illustration. Proxima Cen b is known through the motion it induces in its red-dwarf host. The radial-velocity signal supplies a minimum mass, because an unknown orbital inclination changes the observed velocity amplitude. The saved radius estimate comes from a mass–radius relation rather than a measured transit. The catalog radius of 1.02 Earth radii is calculated, not directly measured. The mass entry, 1.055 ± 0.055 Earth masses, is M sin i: a minimum mass unless the inclination is known. The source papers and full table retain the provenance of each parameter.
The illustrated viewpoint
The surface and sky are imagined. Neither a minimum mass near Earth’s nor the planet’s orbital distance establishes breathable air, a particular terrain or liquid surface water.
The surface and sky are imagined. Neither a minimum mass near Earth’s nor the planet’s orbital distance establishes breathable air, a particular terrain or liquid surface water. All depicted life and technology are fictional.
Catalog measurements & sources
Host: Proxima Cen. Snapshot: 25 September 2026. Errors, limits and source provenance are retained. Calculated values and model estimates are not direct measurements. Unknown is not zero; equilibrium temperature is not surface temperature.
| Quantity / unit | Value / reported errors | Source |
|---|---|---|
| Radius · Earth radii | 1.02 | Calculated Value |
| Mass · Earth masses | 1.055 (+0.055 / -0.055) | Suárez Mascareño et al. 2025 |
| Density · g/cm³ | 5.46 | Calculated Value |
| Orbital period · days | 11.1846 (+0.00053 / -0.00053) | Suárez Mascareño et al. 2025 |
| Orbital semimajor axis · AU | 0.04848 (+0.00029 / -0.00029) | Suárez Mascareño et al. 2025 |
| Eccentricity | 0 | Suárez Mascareño et al. 2025 |
| Inclination · degrees | Unknown | Not supplied |
| Irradiation · Earth flux | 0.641 (+0.065 / -0.065) | Suárez Mascareño et al. 2025 |
| Equilibrium temperature · K | 218 (+18 / -18) | Suárez Mascareño et al. 2025 |
| Stellar effective temperature · K | 2900 (+100 / -100) | Suárez Mascareño et al. 2025 |
| Stellar radius · Solar | 0.141 (+0.021 / -0.021) | Suárez Mascareño et al. 2025 |
| Stellar mass · Solar | 0.1221 (+0.0022 / -0.0022) | Suárez Mascareño et al. 2025 |
| Stellar luminosity · log Solar | -2.82102 (+0.02242 / -0.02364) | Suárez Mascareño et al. 2025 |
| Stellar age · Gyr | Unknown | Not supplied |
| Stellar metallicity · dex | Unknown | Not supplied |
| Distance · pc | 1.30119 (+0.00034 / -0.00035) | TICv8 |