South Korea's presidential office says North Korea's satellite did not reach orbit as the communist nation claims.
Pyongyang earlier claimed success in launching its communication
satellite into space.
State-run media said Sunday that the satellite was already transmitting data and patriotic odes to leader Kim Jong Il and founder Kim Il Sung.
President Barack Obama and Japanese leader Taro Aso have called the launch a provocative move that violates a U.N. Security Council resolution barring North Korea from such launches.
A Security Council session is set for Sunday afternoon in New York.