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Barnard d is a Rocky exoplanet (a small, dense world with a solid surface) with a mass of 0.3 Earth masses. It has an equilibrium temperature of 483 K (210°C). The planet completes one orbit around its star every 2.3 Earth days. It was discovered in 2025 using the radial velocity method. It orbits the M-type star Barnard's star, located approximately 2 parsecs (6 light-years) from Earth.
2025
Discovered
0.3
Earth Masses
483
Temperature (K)
Discovery Information
Discovery MethodRadial Velocity
Discovery Year2,025
Discovery FacilityGemini Observatory
Orbital Properties
Orbital Period2.3402 days
Semi-Major Axis0.0188 AU
Eccentricity0.04
Physical Properties
Mass (Jupiter)0.0008 MJ
Mass (Earth)0.263 M⊕
Eq. Temperature483 K
Planetary Extremes
Where Barnard d sits on the spectrum of all known exoplanets.
Mass0.3 M⊕
FeatherweightColossus
Temperature483 K
FrozenInferno
Year Length2.3 days
LightningGlacial
Star Distance0.019 AU
ScorchedFrozen exile
Star System View
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Orbit Comparison
Earth: 365.25 days (1 AU)Barnard d: 2.3 Earth days (0.019 AU)
Host Star: Barnard's star
Spectral TypeM3.5-4 V
Effective Temperature3,195 K
Mass0.162 M☉
Radius0.185 R☉
Size vs Sun5.41x smaller
Luminosity0.0036 L☉
Luminosity vs Sun281.7x dimmer
Metallicity [Fe/H]-0.56
Distance (pc)1.8266 pc
Distance (ly)6.0 light-years
Planets in the Barnard's star System
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