KH-4 (KeyHole-4) 9047 was a USAF satellite launched on November 5, 1962, into an orbit with a perigee of 209 km, an apogee of 403 km, a period of 90.7 min, and an inclination of 75.0 degrees. Particles and fields experiments were included on this satellite to study effects of high altitude nuclear explosions of the United States and the Soviet Union. It re-entered the earth's atmosphere on December 3, 1962.