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P-11 4001, 4101, 4102, 4301, 4302

Hitchhiker [USAF]
SSF-A probably similar

The satellites are the first series of so called "Subsatellite Ferrets", low orbit ELINT/SIGINT satellites to pinpoint and characterize different Radar emitters in the Soviet Union and Warsaw pact states. As the proper name of these satellite has not been disclosed yet, they are referred to as "Subsatellite Ferret A" (SSF-A). This series was also known as Program 11 or P-11.

These subsatellites were deployed from the propulsion rack of the Agena-D stage of KH-4 Corona, KH-5 Argon and KH-7 Gambit-1 reconnaissance satellites. They used a solid-fuel kick-motor to maneuver themselves into their operational orbits after deployment.

The satellites contained each one or two focused payloads and might have differed in design.

Three more P-11 satellites were launched as unclassified scientific satellites under the name Hitchhiker.

Nation: USA
Type / Application: ELINT, SIGINT
Operator: USAF
Contractors: Lockheed
Equipment: ?
Configuration: P-11 bus
Propulsion: Kick motor
Power: Solar cells, batteries
Satellite COSPAR Date LS Launch Vehicle Remarks
P-11 4001 1963-042B 29.10.1963 Va 75-3-4 Thor-SLV2A Agena-D with KH-5 10
P-11 4101 1963-055B 21.12.1963 Va 75-1-2 Thor-SLV2A Agena-D with KH-4 26
P-11 4102 1964-F11 07.10.1964 Va PALC-2-4 F Atlas-SLV3 Agena-D with KH-7 12
P-11 4301 (OPS 4923) 1964-036B 06.07.1964 Va LC-2-3 Atlas-LV3 Agena-D with KH-7 9
P-11 4302 (OPS 5063) 1964-068B 23.10.1964 Va PALC-2-3 Atlas-LV3 Agena-D with KH-7 13