Psi Upsilon IV
Psi Upsilon IV was the inhabited fourth planet in its star system. 

Daniel Kwan, half-Human half-Napean son of Ronald and Emiraa was born on this planet, on stardate 22804.3. (, production art)

See also 
 Psi Upsilon III

ja:プサイ・ユプシロン4号星
Psi Upsilon 04