6 known planets in exoplanet.eu: K2-138 b, K2-138 c, K2-138 d, K2-138 e, K2-138 f, K2-138 g.
K2-138: 6 known planets in exoplanet.eu: K2-138 b, K2-138 c, K2-138 d, K2-138 e, K2-138 f, K2-138 g. The catalogue of known planets · SetuHQ home
