Vorash

Vorash was a planet the Tok'ra established a base on. It was the only planet with a breathable atmosphere in the system, and Vorash itself was a desert world. When SG-1 acquired a Ha'tak after they killed Cronus, they planned to move the Tok'ra to a world without a Stargate, intending to take the Vorash Stargate with them. Tanith, however, sent a message to Apophis, who brought his fleet to attack the planet. After this, Jacob and Samantha Carter decided on a different course of action: after dialing P3W-451, they lanuched the Stargate into the sun, causing it to lose some of it's hydrogen and supernova. The plan worked, destroying Apophis' fleet, but causing the Tau'ri ha'tak and Apophis' mothership to travel four million lightyears.

Behind the scenes
Stargate SG-1: The DVD Collection issue 11 gives a completely different address for this planet which contains the point of origins for both Earth and Abydos. This was later fixed, however, as Stargate SG-1: The Ultimate Visual Guide gives the address we currently use.