This planet has no known canonical name. While the information presented in this article is canonical, the planet described lacks an official name, thus the title is conjecture.
The Planet (Nemesis) was a planet in the Idagalaxy. At one point, the planet was visited by the Replicators. The Asgard visited the world later and found deactivated Replicator blocks. It is unknown if the planet had a Stargate when the Asgard visited the planet. (SG1: "Nemesis")