In that year, the Centaur mistakenly attacked a Jem'Hadar attack ship being commanded by Captain Benjamin Sisko for a covert mission. The Centaur pursued the attack ship into Dominion territory before being chased off by additional Jem'Hadar ships. (DS9: "A Time to Stand")
Background information Edit
The Centaur was a "kitbashed" scale model created from the saucer section and warp nacelles of two AMT/Ertl USS Excelsior model kits and the torpedo rollbar and bridge from an Ertl USS Reliant kit. It was listed as "Excelsior-class starship variant" in the Star Trek: Deep Space Nine Technical Manual due to the use of the Excelsior saucer section. However, it has now been established that the original scale of the shooting model was much smaller and was based on the bridge section and other details from the Miranda-class Reliant model, not the saucer section.  No further name was known; it was generally referred to as "Centaur-class" or Centaur-type, and was considered a prototype. Whatever its formal class designation, dialogue from "Sacrifice of Angels" suggests that it was considered a "destroyer"-type starship.
Registry number Edit
The third edition of the Star Trek Encyclopedia gave no registry number in its entry about this ship, although NCC-42043 was used in the Star Trek Fact Files and Star Trek: The Magazine(citation needed • edit). As for the shooting model itself, we know only that the number was used along with the name Buckner. (X)
Many years later, there was a side view of the Centaur in the Star Trek Encyclopedia (4th ed., vol. 1, p. 127). The ship bore the registry NCC-42043.