Proxima Centauri
Proxima Centauri is a red dwarf star and the closest known star to the Sun.
How big is it?
214,300 km across
Diameter · rounded model
A little perspective
About 1.53 times the mean diameter of Jupiter.
Jupiter: Jupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.
Measurements, assumptions & sources +
Proxima Centauri
A rounded red-dwarf reference. Radius and mass are approximate.
Defined examples — our methodology
The marked diameter is calibrated. Unmeasured illustration details are representative.
Jupiter
Mean-radius spherical model for Jupiter; actual shape is not perfectly spherical. Gravity refers to a conventional atmospheric level, not solid ground.
NASA JPL — planetary physical parameters
The marked mean diameter is calibrated. Unmeasured illustration details are representative.
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Why this measurement?
Why we use 214,300 km
For comparison, this page uses diameter. This is labelled rounded model: an explicit comparison model rather than a claim that every example has the same value.
A rounded red-dwarf reference. Radius and mass are approximate.
The marked horizontal span follows the named feature; transparent margins and unmeasured details do not alter it. How calibrated comparisons work →
Recorded properties
Proxima Centauri dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 214,300 km | Not recorded | rounded model | |
| 40,620 M⊕ | Not recorded | rounded model |
Around this scale
Go smaller. Go bigger.
These links use compatible length records, ordered around the selected value.
Nearest lower value · SpaceJupiter139,800 kmJupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.
Around the same scale · SpaceSaturn116,500 kmSaturn is a giant planet made mostly of hydrogen and helium, distinguished by its extensive ring system.
Nearest higher value · SpaceEarth–Moon distance384,400 kmThe Earth–Moon distance is the average space between the centres of the Earth and the Moon.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
More ways to see it
Curated comparisons
There’s always another scale
Follow your curiosity.
SpaceSun1,391,000 kmThe Sun is the star at the centre of the Solar System.SpaceJupiter139,800 kmJupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.
SpaceNeutron star20 kmA neutron star is the dense remnant core left after a massive star explodes as a supernova, composed mostly of neutrons.SpaceEarth–Moon distance384,400 kmThe Earth–Moon distance is the average space between the centres of the Earth and the Moon.SpaceSaturn116,500 kmSaturn is a giant planet made mostly of hydrogen and helium, distinguished by its extensive ring system.
SpaceUranus50,720 kmUranus is an ice giant planet with a blue-green atmosphere, orbiting the Sun on its side.
SpaceNeptune49,240 kmNeptune is an ice giant planet with a deep blue atmosphere, orbiting the Sun beyond Uranus.SpaceSirius A2,379,000 kmSirius A is the brighter main-sequence star in the Sirius binary system.