The Vulcan survey ship that detected Zefram Cochrane's warp flight and landed at Bozeman, Montana, on 5 April 2063, making first contact between Vulcans and humans.
The T'Plana-Hath is the Vulcan survey ship seen at the end of the film Star Trek: First Contact. Passing through the Sol system in 2063, its crew detect the warp signature of Zefram Cochrane's Phoenix and change course for Earth.
The ship lands on three folding legs outside the settlement at Bozeman, Montana, where its captain greets Cochrane with the Vulcan salute. The name is not spoken in the film; it honours T'Plana-Hath, the matron of Vulcan philosophy quoted in Star Trek IV: The Voyage Home.
The design has since given its name to the T'Plana-Hath type of Vulcan lander. The landing is replayed in the Enterprise episode In a Mirror, Darkly, where the mirror Cochrane shoots the Vulcan captain and humans loot the ship.