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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.

Nation: USA
Type / Application: Reconnaissance, photo (film scan type)
Operator: US Air Force (USAF)
Equipment: E-2 camera
Configuration: Agena-B
Propulsion: Bell 8081
Lifetime: 4 months
Orbit: 480 km × 480 km, 83 (intended)
Satellite COSPAR Date LS Launch Vehicle Remarks
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
Further Samos missions:

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