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Thor SLV-2A Agena D | KH-4A 32

McDonnell Douglas | United States of America
Vandenberg SFB, CA, USA
May 3, 1966, 7:25 p.m.
Status: Launch Failure
Mission:

The KH-4A (Keyhole-4A) was the fifth optical reconnaissance satellite version in the Corona-program.

Low Earth Orbit
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Kosmos 11K63 | DS-P1-Yu 5

Strategic Rocket Forces | Russia
Kapustin Yar, Russian Federation
April 26, 1966, 10:04 a.m.
Status: Launch Successful
Mission:

The DS-P1-Yu series of satellites was used to calibrate space surveillance and early warning radars.

Low Earth Orbit
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Molniya 8K78 | Molniya-1 3

Strategic Rocket Forces | Russia
Baikonur Cosmodrome, Republic of Kazakhstan
April 25, 1966, 7:10 a.m.
Status: Launch Successful
Mission:

The Molniya were Soviet communication satellites operating from an inclined highly elliptical earth orbit of 500 km × 40000 km with 12 hour period for coverage of high northern latitudes.

Elliptical Orbit
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Scout B | OV3-1

Vought | United States of America
Vandenberg SFB, CA, USA
April 22, 1966, 9:45 a.m.
Status: Launch Successful
Mission:

The OV3 (Orbiting Vehicle 3) series were experimental satellites based on an octagonal bus structure. These were the only in the OV series launched on dedicated launchers.

Polar Orbit
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Vostok 8A92 | Zenit-2 37

RKK Energiya | Russia
Baikonur Cosmodrome, Republic of Kazakhstan
April 20, 1966, 10:40 a.m.
Status: Launch Successful
Mission:

Zenit-2 film-return and ELINT reconnaissance satellite.

Low Earth Orbit
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Atlas SLV-3 Agena D | KH-7 27

Convair | United States of America
Vandenberg SFB, CA, USA
April 19, 1966, 7:15 p.m.
Status: Launch Successful
Mission:

The Program 206 satellite, carrying the KH-7 (Keyhole 7) camera system (codenamed Gambit-1), was the first successful high resolution space reconnaissance program. It was managed by NRO's Program A, the USAF-led segment of the National Reconnaissance Program managed from Los Angeles AFB in El Segundo, California.

Sun-Synchronous Orbit
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Atlas SLV-3 Agena D | OAO 1

Convair | United States of America
Cape Canaveral SFS, FL, USA
April 8, 1966, 7:35 p.m.
Status: Launch Successful
Mission:

OAO 1 (Orbiting Astronomical Observatory 1) was a solar-cell-powered satellite instrumented to make precision astronomical observations and to measure the absorption and emission characteristics of the stars, planets, nebulae, and the interplanetary and interstellar media from visible to gamma-ray regions.

Low Earth Orbit
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Atlas Centaur D | Surveyor M-2

Convair | United States of America
Cape Canaveral SFS, FL, USA
April 8, 1966, 1 a.m.
Status: Launch Successful
Mission:

Dummy payload

Low Earth Orbit
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Thor SLV-2A Agena D | KH-4A 31

McDonnell Douglas | United States of America
Vandenberg SFB, CA, USA
April 7, 1966, 10:02 p.m.
Status: Launch Successful
Mission:

The KH-4A (Keyhole-4A) was the fifth optical reconnaissance satellite version in the Corona-program.

Low Earth Orbit
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Voskhod | Zenit-4 17

Soviet Space Program | Russia
Plesetsk Cosmodrome, Russian Federation
April 6, 1966, 11:40 a.m.
Status: Launch Successful
Mission:

Zenit-4 film-return reconnaissance satellite.

Low Earth Orbit
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