The 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 OrbitDiscoverer I was the first of a series of satellites part of the CORONA reconnaissance program. This satellite didn't take a camera or film system as it was intended as a test. There were issues communicating with the satellite during flight with only intermittent signals being read.
Polar OrbitVanguard II is an Earth orbiting satellite and the first weather satellite. It was designed to measure cloud-cover distribution over the daylight portion of its orbit for a period of 19 days and to provide information on the density of the atmosphere.
Medium Earth Orbit