Theta class (starship)
The Theta-class raider was a type of starship used by the Miradorn during the 2360s and 70s. 

The Theta-class raider was equipped with deflector shields and armed with a dual forward photon torpedo bank and two wing mounted cannons for launching concentrated plasma charges. With this weaponry it could easily outgun small ships, such as Starfleet  runabouts. Its maximum velocity was capable of exceeding warp 5. ()

Ships of the class
 Ah-Kel's raider

Appendices

Background information
This studio model was designed by Ricardo F. Delgado, and was described on his concept art as a "raptor". Notes on the camera test model of Baran's ship indicate this ship to be "1/4 length of Enterprise", which suggest an approximately length of 160 meters. 

In "Vortex", the runabout's computer identified Ah-Kel's raider as "Miradorn vessel, Theta-class", suggesting that the ships of this class are constructed by the Miradorn.

Baran's mercenary vessel, later seen in  and , was not specified as a Theta-class ship in those episodes, but rather the ship classification BC 011. However, based on its numerous similarities, unmodified studio model and use as a mercenary ship, and moderate top speeds, suggest it is also a ship of this class.

Apocrypha 
A model of the Miradorn starship was released by Galoob as part of their Star Trek Micro Machines collection. Star Trek: The Official Starships Collection released the raider as Baran's ship.

The CCG: Second Edition named this type of vessel as a Ma-Karn-class ship.

External links
 
 

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Starship classes