La massa joviana (simbòl : MJ) es una unitat de massa utilizada en astronomia per exprimir la massa d'objèctes subestellars coma una planeta giganta ò una nana bruna.
Es egala a la massa de Jupitèr, es a dire 1,8986.1027 kg. Correspond a 317,83 massas terrèstras ò a 9,546.10-4 massa solara.
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