Exoplanet · Gliese 251
GJ 251 c
Orbit0.2 AU
Year53.6 days
Mass≥ 3.88 M⊕
Temperature~216 K (estimated)
It circles Gliese 251 once every 53.6 days, 0.2 AU out: about 2 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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