Explorer 39

Explorer 39, also known as AD-C (Air Density C), was an American scientific satellite belonging to series Air Density. It was launched on August 8, 1968, join with Explorer 40, from Launch Complex 5 of the Vandenberg Air Force Base, through a Scout rocket. Explorer 39 orbited the Earth once every 118.2 minutes, at an inclination of 80.6°. Its perigee was 680 kilometres (420 mi) and apogee was 2,522 kilometres (1,567 mi). Explorer 39 re-entered the atmosphere on June 22, 1981.

Explorer 39

Explorer 39, also known as AD-C (Air Density C), was an American scientific satellite belonging to series Air Density. It was launched on August 8, 1968, join with Explorer 40, from Launch Complex 5 of the Vandenberg Air Force Base, through a Scout rocket. Explorer 39 orbited the Earth once every 118.2 minutes, at an inclination of 80.6°. Its perigee was 680 kilometres (420 mi) and apogee was 2,522 kilometres (1,567 mi). Explorer 39 re-entered the atmosphere on June 22, 1981.