Samos (Satellite and Missile Observation System), originally named Sentry, was the second program that evolved from WS 117L and aimed at developing a heavier reconnaissance satellite that would be launched by an Atlas booster instead of the Thor used to launch the project Discoverer (Corona). Samos E-2 was also called Program (or Project) 101A.
The Samos E-2 series carried E-2 frame readout camera with 0.91 m focal length, 6 m ground resolution, and 27 km × 27 km frame coverage. The Agena stage remained connected to the spacecraft and provided attitude control.
It carried also Micrometeorite detectors (grid, acoustic, microphone), a Magnetometer, a Electric field meter plasma probe, a Neutron albedo experiment and density gauges.
|Type / Application:||Reconnaissance, photo (film scan type)|
|Operator:||US Air Force (USAF)|
|Orbit:||480 km × 480 km, 83° (intended)|
|Samos E-2 1 (Samos 3)||1961-F09||09.09.1961||Va LC-1-1||F||Atlas-LV3 Agena-B|
|Samos E-2 2||-||not launched||Va||Atlas-LV3 Agena-B|