A small Federation science vessel type represented by the USS Raven, the ship in which Magnus and Erin Hansen took their daughter Annika to study the Borg.
The Raven is a compact ship with a blunt hull and two short nacelles, small enough to land and suited to a tiny crew on a long survey. It carries the civilian-style registry NAR-32450.
In the Voyager episode The Raven, Seven of Nine is drawn by a Borg homing signal to a moon in B'omar space, where she finds the wreck of her parents' ship and remembers being assimilated there as a child. Dark Frontier shows the Hansens' journey in flashback: they leave Federation space in the 2350s, follow a cube through a transwarp conduit into the Delta Quadrant and shadow the Collective for years using their own shielding, until an ion storm exposes them. Their field notes later help Janeway plan a raid on a Borg sphere.