The USS Constellation (NCC-55817) was a 24th century Federation starship operated by Starfleet. In 2364, this starship was commanded by Captain Louis Rubenstein. On stardate 42623.2, Gregory Quinn of Starfleet Operational Support Services sent a mission order to this ship about revised ship refit specs. Later that year, this order was read by Lieutenant Commander Data during an investigation into an alleged conspiracy in the highest levels of Starfleet Command. (TNG: "Conspiracy" , okudagram)