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|Expected Duration:||20 years|
|Resupply Interval:||1 year|
|Refit Interval:||5 years|
|Cruising Speed:||Warp 1.5 (TOS)|
|Maximum Speed:||Warp 1.7 (TOS)|
|Emergency Speed:||Warp 2.0 (TOS)|
|[ Source ]|
The Neptune-class was a type of United Earth starship in Starfleet service during the mid-22nd century.
Originally developed for planetary defense, survey, and escort roles within the Earth Starfleet of the early to mid twenty-second century, the four deck 'warp delta' design was an evolution of the earlier NA-class S.S. Emmette solar explorer and the Lockheed Martin X-33 Venture Star orbiter spacecraft of the previous century. A predecessor of the NX-class, the Neptune featured nuclear fusion power and was capable of achieving speeds up to warp two. The ship was initially armed with plasma cannons which were upgraded to phase cannons in the 2150s.
Two ships of this class came to the assistance of the Enterprise NX-01 in 2153 when, on its return to Earth, the Enterprise came under assault from a Klingon warship. Together with the starship Intrepid, the four Starfleet vessels managed to overwhelm the Klingons and drive them off.