The USS Stefansson (NCC-2818) was a Emperor-class Starfleet explorer starship commissioned on 2382 into Admiral Truman's Starfleet Third Fleet. (Star Trek: Pioneer)
The Stefansson was under the command of Captain Connor Burt in 2382, with Commander Sally Romero as the executive officer.
The Stefansson was named after Vilhjalmur Stefansson, a Canadian Arctic explorer from the 20th century.
Burt was given command of the Stefansson in late 2382, despite his mental breakdown in 2381. With the Coalition War in full swing, his knowledge and experience with the Oralian sector, and in-particular the So'jan, overshadowed his psychology problems. Starfleet Command agreed to give him command of the ship in-exchange for his guarantee that he would keep up with a medicine regimen assigned by Starfleet Medical. ("For Better or Worse")
In 2382, the Stefansson participated in the last part of the Battle of Minark. ("Torment and Woe")
In early 2383, the Stefansson accompanied the USS Pioneer to the planet of Yoth. ("The Forgotten Planet")