Explorer 6 was an American satellite designed to study trapped radiation of various energies, galactic cosmic rays, geomagnetism, radio propagation and the flux of micrometeorites. It also tested a scanning device designed for photographing the Earth's cloud cover, and transmitted the first pictures of Earth from a satellite.
Elliptical OrbitThe S-1 satellite was a geoscience satellite equipped with a suite of scientific instruments to study the environment around the Earth. It was destroyed 5 seconds into launch when the launch vehicle exploded due to an issue with the launch vehicles power supply.
Elliptical OrbitThe Vanguard satellite was a 13 inch spherical satellite which contained a precise magnetometer to map the Earth's magnetic field. The satellite was lost together with the Vanguard Balloon when the Vanguard launch vehicle second stage was damaged during staging.
Low Earth OrbitDiscoverer II successfully reached orbit and took photos of Earth. However, when the capsule with the data was ejected in order to re-enter the atmosphere there was a timer malfunction meaning it seperated too early and landed over the North Pole rather than the intended target of Hawaii. The capsule was never recovered.
Polar Orbit