Planet (Coup D'etat)
Astrographical information
Galaxy	Pegasus
Out of universe information
Appearances	"Coup D'etat"

[Source]

This is an unnamed planet in Pegasus galaxy, which holds a Stargate. Ladon Radim contacted Atlantis from this planet in an effort to trade a depleted Zero Point Module for supplies he could use in his "rebellion" against Cowen. (ATL: "Coup D'etat")