This page contains information regarding Star Trek: Discovery, and thus may contain spoilers.
The homeworld of the warp-capable Orions, Orion was an inhabited planet in the Pi³ Orionis system. This star was located in the Orion sector of the Alpha Quadrant. This planet was near to the route that a spacecraft would travel from Deep Space 9 to Earth. (TNG: "Conspiracy", display graphic; DS9: "Little Green Men")
The Adashake Center was a scenic square on Orion.
In 2293, the location of Orion in the Milky Way Galaxy was labeled in a star chart that was in Captain James T. Kirk's quarters aboard the USS Enterprise-A. (Star Trek VI: The Undiscovered Country, okudagram)
In 2399, the location of Orion was labeled on a star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This planet was in or near to Federation space. (PIC: "Maps and Legends")
Orion once harbored a highly advanced civilization whose history had drawn great interest from Federation historians and archaeologists alike. During the mid-23rd century, noted Federation archaeologist Doctor Roger Korby translated medical records from the Orion ruins that helped revolutionize modern immunization techniques and were required reading at Starfleet Academy. In 2269, through the assistance of the Guardian of Forever, Starfleet officers Captain James T. Kirk, Commander Spock and historian Lieutenant Erickson traveled to the dawn of Orion's civilization to view the planet's history unfold firsthand. (TOS: "What Are Little Girls Made Of?"; TAS: "Yesteryear")
Devna, an Orion trapped in Elysia, told Kirk that she wished to return through the time barrier and see Orion again. Kirk offered to take her back with him, but she declined, stating that she had accepted where she now was in life. (TAS: "The Time Trap")
In 2372, Ferengi entrepreneur Quark attempted to smuggle kemocite on a highly profitable side trip to Orion under the guise of taking his ship, Quark's Treasure, on a test flight to Earth. This proved to be unsuccessful due to sabotage. (DS9: "Little Green Men")
|Pi³ Orionis system|
|Orion • Orion I • Orion III|
In the final draft script for "The Menagerie, Part II", a scene set on the Orion colony (according to dialogue) was stated, in the teleplay's scene descriptions, to be "on Orien" (that spelling was consistently used for anything Orion in the two-parter's script).
According to Star Trek: Star Charts (pp. 36, 45, 60), the planet Orion had been visited by Zefram Cochrane on his final voyage in 2120. Orion was a non-aligned world before and after 2161, the founding date of the Federation. In 2378, Orion was a destination on the major space lanes.
According to Star Trek Maps (p. 36), the Rigel system and the Orion system were one and the same. The planet Orion was the eighth planet in the system. This is corroborated by The Worlds of the Federation and FASA's The Orions sourcebook, which names the Orion homeworld as "Botchok".
In the novels A Choice of Futures and Tower of Babel, Orion was called "Pi 3 Orionis III". The novel Silent Weapons simply calls it "Orion" or the "Orion homeworld", and the novel The Light Fantastic calls it "Orion Prime." All these novels share the continuity, and refer to the same planet.
In Star Trek Online, Orion Prime is the second planet in the Orion system, which has five worlds. It is also deserted due to excessive pollution.