P3C-599
From The Stargate Omnipedia
Originally designated P3W-924, this planet was the location where Ma'chello was found.
Ma'chello slept amidst his armory of technology, including his mind transfer device and several palm-sized data devices. Following his death these items were taken back to Earth for safekeeping from the Goa'uld as well as further study.
DETAILS
HOME TO - Uninhabited
FIRST APPEARED - Holiday
KEY EPISODES
Holiday - SG-1 visits P3W-924 and discovers a human with a vast array of superior technology and a hatred for the Goa'uld.
Legacy - Carter searches the S.G.C. computers for items that were returned from Ma'chello's hideout world, recently redesignated P3C-599.