Nikkei opened 0.48 percent higher in early Tokyo trading Tuesday. At 9:15 a.m., the 225-issue Nikkei Stock Average was up 47.04 points, or 0.48 percent, at 9,875.92. The broader Topix index of all First Section issues on the Tokyo Stock Exchange was up 4.08 points, or 0.51 percent, at 811. 92.