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The appearance of the Essex has not been established in canon. USS Essex ( NCC-176) as represented in the Chronology
Lieutenant Morgan Kelly (security officer). Commander Steven Mullen (first officer). The criminals impersonated the crew of the Essex and attempted to take over the Enterprise, but were unsuccessful. In 2368, the USS Enterprise-D detected the distress signal of the Essex, over two hundred years old, and investigated the moon. The ship's distress call continued to signal. The criminals nearly escaped their imprisonment on board the Essex, but the ship was incapable of eluding this moon's electromagnetic storms and it was destroyed with all hands. There, it was overtaken by non-corporeal criminals from the Ux-Mal star system, who had been imprisoned on the moon centuries before, attempted to escape by possessing the Essex crew. That year, the Essex visited the class M moon of Mab-Bu VI. The Essex operated out of Starbase 12, under the sector command of Admiral Uttan Narsu.
In 2167, the Essex was commanded by Captain Bryce Shumar. The USS Essex ( NCC-173) was a 22nd century Federation Daedalus-class starship operated by Starfleet.