Psi Upsilon III

From Memory Alpha, the free Star Trek reference

Psi Upsilon III was the third planet in the Psi Upsilon system. An annex of the Starfleet Academy was located on its surface.

Daniel Kwan graduated the from the Academy annex on Psi Upsilon III on stardate 40571.5. (TNG: "Eye of the Beholder")

An okudagram readout of Kwan's personnel file was displayed on a viewscreen that Deanna Troi was studying. Some of the facts could be called into question since she was involved in a very detailed hallucination when the data was shown. This could explain why the stardate indicates he graduated when he was only six months old.