Rigel class
Rigel-class was the original intended starship class of the , as it was listed in an okudagram in , before the ship was seen in  as an  heavy cruiser. After a second appearance of the ship list in , the okudagram was corrected. A later version of the graphic listed the Zhukov correctly as an Ambassador-class starship.

According to the  the , mentioned, but not seen in  and  and the , mentioned in , were both Rigel-class starships. No specific model was ever built for the Rigel-class. The dialogue about the wreck of the Tolstoy being seen in the debris field in "The Best of Both Worlds, Part II" was added in post production to replace a line about the , a  starship, that actually appeared on screen. Michael Okuda remembered,"Rigel: I don't think we ever came up with a ship design specifically tied to that name."  In the , he also wrote that the designation Rigel-class was conjectural. StarTrek.com incorrectly identifies the model that was labeled as  as the Tolstoy in their Rigel-class article. 

According to the apocryphal Last Unicorn Games sourcebook The Price of Freedom, Rigel-class starships were heavy scouts, 215 meters in length, with a crew of 65. The ships had a maximum speed of warp factor 9.2.

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Federation starship classes (retconned)