The Delta Eridani system was a star system in or near Federation space. Sahu was in the Delta Eridani system, and in 2377, the USS Enterprise-E, under temporary command of Commander William Riker, undertook a relief mission to Sahu. (CoE eBook: Remembrance of Things Past, Book I) Memory Alpha suggests the Delta Rana system, visited in TNG episode: "The Survivors", may have been intended as Delta Eridani, a real-world star.