The USS Arcturus (NCC-1807) was a Constitution-class (Tikopai-subclass) heavy cruiser active in Federation Starfleet service during the 23rd and early 24th centuries. (Star Fleet Technical Manual) Arcturus was commissioned in 2282. It was often the testbed for developing sensor technologies. It had two different commanding officers before a refit ca. 2286. Along with its sister ships, Darion and Vena, Arcturus obtained vast amounts of information about Klingon activities while under the guise of various scientific expeditions. (Ships of the Star Fleet, vol. 1 [revised])