The USS Atmos was a Federation Starfleet starship in service in the mid-22nd century.
In reference stardate 0/9003 (c. 2163), the USS Atmos intercepted the Larc, an Orion personnel transport. After the Atmos received a secret message from slaves making a bid for freedom, the captain of the Larc became the first Orion charged with slavery by the Federation. However, the slaves who'd sent the message were vaporized. (FASA RPG module: The Orions: Book of Deep Knowledge)