Delta 2 was the designation for an uninhabited and unnamed class 4 moon in the Veda system. This system was located in the Alpha Quadrant.
The Federation had surveyed the moon by the mid-23rd century, naming major geographical regions and collecting samples.
A navigational diagram indicated the moon's coordinates as 803.16 80 10.
Agri-transport vessels descend into the Delta 2 atmosphere
In 2257, during the Federation-Klingon War, the moon was terraformed with Prototaxites stellaviatori by the USS Discovery so as to provide a new source of mycelium spores for its spore drive. (DIS: "The War Without, The War Within"; PIC: "Maps and Legends")
Locations[]
These labels are in fact features of the planet Mercury.
The location of Veda was labeled on a star chart seen in the Star Trek: Picard episode "Maps and Legends".
According to the revised edition of the Stellar Cartography: The Starfleet Reference Library ("History of the United Federation of Planets"), the Veda system was located in the Beta Quadrant.