The USS Nova (NCC-73515) was a Federation starship in service in the 2370s.
In 2379, the Nova was assigned to Starfleet Battle Group Omega, which was deployed to the Romulan Neutral Zone to counter an anticipated Reman invasion. (Star Trek Nemesis)
Background
Though it has not been confirmed, it is possible that this ship is the prototype of the Nova-class and the class was named for the USS Nova. However, the registry number doesn't correspond to this theory, considering the USS Equinox, itself a Nova-class starship, had the lower registry number of NCC-72381, suggesting the Equinox came before the Nova. It could be suggested that the USS Nova referred to in Star Trek Nemesis was a replacement for the prototype ship of the Nova-class.