The USS Mengen (NCC-1773) was a Constitution-class Federation heavy cruiser starship of the Achernar-subclass, ordered for construction in the 23rd century, named for the star Mengen.
Construction of Mengen was authorized by the Starfleet appropriation of stardate 5930. (ST reference: Star Fleet Technical Manual)
- The stardate given would seem to suggest this ship was ordered during the TAS era. It is not positively known if this vessel was built, only that it was authorized.