The Hitchhiker satellites were prototype satellites in the P-11 program, which served scientific purposes. Later P-11 satellites were built as classified SIGINT subsatellites.
Hitchhiker 1 was put into an elliptical orbit to measure the energy and pitch-angle distribution of protons and electrons. The intrumenttation was provided by the Massachusetts Institute of Technology (MIT) and by American Science and Engineering. The instrument suit consisted of:
|Type / Application:||Experimental|
|Power:||Solar cells, batteries|
|Orbit:||331 km × 4125 km, 82.14° (#1); 271 km × 3724 km, 95.69° (#2)|
|Hitchhiker (1) (P-11 4051)||1963-F03||18.03.1963||Va 75-3-4||F||Thor-SLV2A Agena-D||with KH-6 1|
|Hitchhiker 1 (P-11 4201)||1963-025B||27.06.1963||Va 75-1-2||Thor-SLV2A Agena-D||with KH-4 22|
|Hitchhiker 2 (P-11 4202, OPS 3316)||1964-045B||14.08.1964||Va PALC-2-4||Atlas-SLV3 Agena-D||with KH-7 10|