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We report on the discovery of a free-floating methane dwarf toward thedirection of the young star cluster sigma Orionis. Based on the object'sfar-red optical and near-infrared photometry and spectroscopy, we conclude thatit is a possible member of this association. We have named it as S OriJ053810.1-023626 (S Ori 70 is the abridged name). If it is a true member ofsigma Orionis, the comparison of the photometric and spectroscopic propertiesof S Ori 70 with state-of-the-art evolutionary models yields a mass of 3(+5/-1) Jupiter mass for ages between 1 Myr and 8 Myr. The presence of such alow-mass object in our small search area (55.4 sq. arcmin) would indicate arising substellar initial mass function in the sigma Orionis cluster even forplanetary masses.Comment: Accepted for publication in the ApJ. Twelve pages, figures and tables  include

A Methane, Isolated, Planetary‐Mass Object in Orion