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The USS Sirius (NCC-1744) was a Constitution-class Federation heavy cruiser starship of the Achernar-subclass, ordered for construction in the 23rd century, named for the star Sirius.
Construction of Sirius was authorized by the Starfleet appropriation of stardate 5930. (Reference book: 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.