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:
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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…
Dr. Sam A[illegible]]
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)