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The Infrared Processing and Analysis Center (IPAC), denies that IRAS ever discovered the 12th.

...Nearly everyone on the IRAS Science Team who looked at the early IRAS data found at least one source that they initially thought could be "the tenth planet". Many of these observations turned out to be IRC+10216, a bright previously known source which is almost exactly in the ecliptic plane (the plane of the planets)...