P2X-555
From The Stargate Omnipedia
Destination of SG-1 during the peak of a solar flare in 1999. The flare "slingshot" SG-1 back to Earth in the past.
SG-5 was later dispatched by General George Hammond to complete the team's mission.
DETAILS
HOME TO - Unknown
FIRST APPEARED - N/A
KEY EPISODE
1969 - SG-1 never arrives on P2X-555, and is later replaced for the mission by SG-5.