Exoplanet · Barnard's Star
Barnard c
Orbit0.027 AU
Year4.12 days
Mass≥ 0.34 M⊕
Temperature~400 K (estimated)
It circles Barnard's Star once every 4.12 days, 0.027 AU out: about 14 times closer than Mercury is to the Sun.
Found in 2025 by the radial velocity method, which measures the star's wobble. That gives a minimum mass, so it could be heavier.
Sources
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