Samos E-6

Samos 7 [USAF]

Samos E-6 (Satellite and Missile Observation System) was an attempt to create an high-resolution reconnaisance satellite with film return via reentry capsule. After the limitations of the original readout system became apparent, the focus shifted to recovery techniques, already pioneered by CORONA. In May 1960 USAF undersecretary Charyk ordered SAMOS to be reoriented to recovery techniques since it had become apparent that readout was in trouble.

Samos-E-6 was also known as Program 201 (later 698BJ).

The Samos-E-6 carried the E-6 recoverable panoramic camera with 0.7 m focal length, 2.4 m ground resolution, and 280 km swath width. E-6 used a different reentry capsule than the Samos-E-5. The Agena stage remained connected to the spacecraft and provided attitude control and retro fire for recovery.

Samos 7 carried a set of piggyback scientific experiments from the Air Force Cambridge Research Labs (AFCRL), including neutron albedo measurements, electron number density and retarding potential analyser instruments, and an infrared radiometer, as well as a nuclear emulsion experiment to measure cosmic radiation.

Samos 8 failed on recovery as the reentry vehicle did not separate from the Agena.

On Samos 9 the Agena secondary propulsion system (SPS) failed to operate due to an electrical short. The retrofire appears to have failed, but the SRV separated anyway and was left in a similar 184 × 234 km orbit. The spacecraft carried a neutron albedo experiment in addition to the USAF intelligence payload.

Samos 10 was deorbited after 1 day; recovery is believed to have been unsuccessful.

Samos 11 was deorbited after one day; recovery was a failure despite the report of emulsion data being obtained. A TRS Mark I research subsatellite, TRS 1, was attached to the Agena 2405 aft rack but failed to separate.