Amon Shek was the planet which Lord Khonsu was said to be from. However, as he was a Tok'ra posing as a Goa'uld and the only person to have said he was from Amon Shek was his former First Prime Her'ak, it is entirely possible that this was not in fact his home planet. It is likely, however, that it is a real planet which was used for his cover story. (SG1: "The Other Guys")