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We report the discovery of a possible planet in microlensing eventMOA-2010-BLG-353. This event was only recognised as having a planetary signalafter the microlensing event had finished, and following a systematic analysisof all archival data for binary lens microlensing events collected to date.Data for event MOA-2010-BLG-353 were only recorded by the high cadenceobservations of the OGLE and MOA survey groups. If we make the assumptions thatthe probability of the lens star hosting a planet of the measured mass ratio isindependent of the lens star mass or distance, and that the source star is inthe Galactic bulge, a probability density analysis indicates the planetarysystem comprises a 0.9^{+1.6}_{-0.53} M_{Saturn} mass planet orbiting a0.18^{+0.32}_{-0.11} M_{sun} red dwarf star, 6.43^{+1.09}_{-1.15} kpc away. Theprojected separation of the planet from the host star is 1.72^{+0.56}_{-0.48}AU. Under the additional assumption that the source is on the far side of theGalactic bulge, the probability density analysis favours a lens systemcomprising a slightly lighter planet.

MOA-2010-BLG-353Lb A Possible Saturn Revealed