CREATE TABLE table_53589 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Attendance" FLOAT)

What opponent had a game with more than 50,705 in attendace on September 13, 1982?
SELECT "Opponent" FROM table_53589 WHERE "Attendance" > '50,705' AND "Date" = 'september 13, 1982'
SELECT "Opponent" FROM "table_53589" WHERE "Attendance" > '50,705' AND "Date" = 'september 13, 1982'