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
Proxima Centauri vs Jupiter: diameter comparison
The diameter of Proxima Centauri is about 1.53 times the mean diameter of Jupiter.
Proxima Centauri is a red dwarf star and the closest known star to the Sun.
Jupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
Proxima Centauri
Diameter: 214,300 km; rounded model.
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 diameter: 139,800 km; approximate.
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.
Use the visual comparison to explore its scale, then check the measurements and sources.
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Why this measurement?
Why we use 214,300 km
We compare the diameter of Proxima Centauri. This is an illustrative comparison value, not a claim that every example is the same.
A rounded red-dwarf reference. Radius and mass are approximate.
The marked horizontal span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
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
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valuePlanets, moons and spaceJupiter139,800 kmMean diameterJupiter is a giant planet composed mainly of hydrogen and helium, orbiting the Sun beyond the asteroid belt.
Around the same scalePlanets, moons and spaceSaturn116,500 kmMean diameterSaturn is a giant planet made mostly of hydrogen and helium, distinguished by its extensive ring system.
Nearest higher valuePlanets, moons and spaceEarth–Moon distance384,400 kmDistanceThe 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.A closer look