The New Orion Nebula was a small cloud phenomena created and named in the year 2267 by Starfleet Captain James T. Kirk.
History and specifics[]
Using two planet-wrecker missiles, the Federation starship USS Enterprise destroyed a planet in the Orion sector to neutralize the blastoneuron neural parasite threat on Deneva. The resulting dust cloud became the New Orion Nebula. (TOS - Star Trek 2 novelization: Operation—Annihilate!)