USS Encounter
From Star Trek: Theurgy Wiki
The USS Encounter was a Federation starship serving in Starfleet in the late 2370's. Doctor Lucan cin Nicander served aboard the Encounter as a medical officer from the time he left Starfleet Medical in 2376 to the time he was assigned to the USS Theurgy in 2378 .
(So far the class of the Encounter has not been revealed.)