Proplyd 133-353 is possibly the largest known exoplanet. This celestial body is likely a sub-brown dwarf/rogue planet. Proplyd 133-353 is likely not able to fuse deuterium disqualifying it from being a brown dwarf, the mass limit for deuterium fusion is slightly over 13M<sub>J</sub> and Proplyd 133-353's mass is likely under this threshold. Proplyd likely has a photoevaporating disk as shown in the graphic on the right. Proplyd 133-353 is also a very young exoplanet with an age of just 500,000 years making it one of the youngest exoplanets known.
It is located in the Trapezium Cluster, 1,260 light years away.<ref name=":0" />
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