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A neighboring system, four light-years away

Proxima Centauri

Two confirmed planets and one candidate in a quiet diagram around a small, active red dwarf. Hover for a quick look, or select a planet to read its full field notes.

Illustrative system view · UTC

Proxima Centauri A small, flare-active red dwarf and the nearest star beyond the Sun. Type M5.5V red dwarf Distance 4.24 light-years Mass About 0.12 Suns Temperature About 3,300 K Proxima Centauri d Confirmed An ultra-close sub-Earth, detected through its subtle pull on the star. Solar Distance 0.0288 AU · 4.31 million km Size and Gravity Minimum mass 0.26 Earths; radius and gravity unknown Planetary Age Unknown; not measured directly Atmosphere and Weather Unknown; no atmosphere detected Moons and Satellites None known Day and Year 5.12-day orbit; rotation unknown Magnetic Shield Unknown Surface Temperature Estimated equilibrium about 282 K; not a measured surface temperature Internal Composition Unknown; rocky composition is plausible Habitability Verdict Receives about 1.8 times Earth’s stellar energy; surface conditions unknown Proxima Centauri b Confirmed A roughly Earth-mass world in the temperate zone of its red dwarf star. Solar Distance 0.0485 AU · 7.26 million km Size and Gravity Minimum mass 1.07 Earths; estimated radius 1.02 Earths; gravity unknown Planetary Age Unknown; not measured directly Atmosphere and Weather Unknown; no atmosphere directly detected Moons and Satellites None known Day and Year 11.19-day orbit; rotation unknown, possibly synchronous Magnetic Shield Unknown Surface Temperature Unknown; depends strongly on any atmosphere Internal Composition Rocky composition is plausible; not directly measured Habitability Verdict Orbits in the star’s habitable zone; this does not establish surface habitability Proxima Centauri c Candidate A proposed outer world; its planet signal has not been confirmed. Solar Distance Proposed 1.48 AU · 221 million km Size and Gravity Proposed minimum mass 5.8 Earths; radius and gravity unknown Planetary Age Unknown; not measured directly Atmosphere and Weather Unknown; no atmosphere detected Moons and Satellites None known Day and Year Proposed 1,900-day orbit; rotation unknown Magnetic Shield Unknown Surface Temperature Not measured; models suggest a very cold world Internal Composition Unknown; sometimes described as super-Earth or mini-Neptune Habitability Verdict Unconfirmed candidate, far outside the temperate zone if real

A small, active star · two confirmed planets · one outer planet candidate

Orbit spacing and animation are illustrative, not to scale. Orbital periods are shown in the planet notes.

Planet data: NASA Exoplanet Archive · NASA Proxima b catalog · NIRPS study