P3X-298 is a planet visited by SG-1 where Daniel Jackson collected a mask fragment.
No details about the planet, nor of SG-1's mission to it, are known except for the fact that Daniel returned with a mask fragment. According to test results, the mask fragment collected by Daniel Jackson dated back to the predynastic period of Egypt. Below is a transcript of the fax results:
Pages 1 of 1Dr. Sam A[illegible]]
To: Dr. Daniel Jackson
Fax# Local #776
Dr. Daniel Jackson
After extensive carbon testing of the main fragment that was collected from planet P3X-298, we find that it is to be dated to match the predynastic period of Egypt on Earth. Official results to be sent to your laboratory…
When Dr. Jackson was paged that he was receiving the fax, he raced away from an interview with Emmett Bregman's documentary crew, just to see if they would chase him.
--Aurora 14:26, 7 July 2006 (PDT)