1960-11-12 USA Discoverer 17

Discoverer 17 was the second satellite in the KH-2 Corona spy satellite series, notable for incorporating the advanced C' camera, which replaced the C model used in the KH-1 missions. This upgraded camera featured variable image motion compensation, allowing the satellites to be flown in various orbits. Alongside its reconnaissance payload, Discoverer 17 also carried a biological research payload designed to study human tissues in space. At that time, the United States did not publicly acknowledge its reconnaissance satellite programs, making this the official primary mission of the satellite. Unexpectedly high radiation levels during the flight resulted in the data from this experiment being regarded as particularly valuable by U.S. Air Force scientists.

Discoverer 17 launch cover with Goldcraft cachet, postmarked at Vandenberg Air Force Base, November 12, 1960.

(Reference from Discoverer 17)

1960-08-18 USA Discoverer 14

Discoverer 14 was a U.S. spy satellite utilized in the Corona program, overseen by the Advanced Research Projects Agency (ARPA) of the Department of Defense and the United States Air Force. On August 19, 1960, usable photographic film images of the Soviet Union taken by the satellite were retrieved by a C-119 recovery aircraft. This marked the first successful recovery of film from an orbiting satellite and the first mid-air recovery of an object returning from Earth orbit.

Photo: An illustration depicting the technique used to recover the returning space capsule from Discoverer 14. This satellite was the first to carry cameras and film.

Discoverer 14 launch cover with Goldcraft cachet, postmarked at Vandenberg AFB on August 18, 1960.

Discoverer 14 launch cover with H.Flick cachet, postmarked at Vandenberg AFB on August 18, 1960.

Photo: An image of a modified C-119 cargo plane equipped with trailing recovery gear.

Discoverer 14 recovery cover with Goldcraft cachet, postmarked at Vandenberg AFB on August 19, 1960.

Discoverer 14 recovery cover with H.Flick cachet, postmarked at Vandenberg AFB on August 19, 1960.

(Reference from Discoverer 14)

1960-08-10 USA Discoverer 13

Discoverer 13 was a U.S. reconnaissance satellite launched on August 10, 1960, at 20:37:54 GMT. As the final test flight of the Corona KH-1 spy satellite series, it marked the first fully successful mission in the Discoverer series. After completing 17 orbits, the satellite's reentry capsule was recovered in the Pacific Ocean on August 11 by the Haiti Victory. The payload, which included an American flag, was presented to President Eisenhower four days later.

Discoverer 13 launch cover with Goldey cachet, postmarked at Vandenberg AFB on August 10, 1960.

Photo: The Discoverer 13 satellite did not carry cameras or film; its capsule contained only diagnostic instruments. This capsule was the first human-made object recovered from space and marked the first successful ocean recovery of a spacecraft.

Discoverer 13 launch cover with H.Flick cachet, postmarked at Vandenberg AFB on August 10, 1960.

Discoverer 13 recovery cover with Goldey cachet, postmarked at Vandenberg AFB on August 11, 1960.

(Reference from Discoverer 13)

1959-06-03 USA Discoverer 3

Discoverer 3 was an American optical reconnaissance satellite launched on June 3, 1959, at 20:09:20 GMT. It was the third of three test flights in the Corona KH-1 spy satellite series and marked the first Discoverer mission to carry live animal passengers. Unfortunately, the mission was lost when its Agena-A booster crashed into the Pacific Ocean. Three black mice were launched from Vandenberg Air Force Base, California, aboard Discoverer 3 as part of this covert operation. They perished when the Atlas upper stage was intentionally fired downward into the Pacific.

Discoverer 3 "Goldcraft" launch cover postmarked at Vandenberg Air Force Base on June 3, 1959.

(Reference from Discoverer 3)

1959-04-13 USA Discoverer 2

Discoverer 2 was a US optical reconnaissance satellite launched on April 13, 1959, at 21:18:39 GMT, serving as the second of three test flights in the Corona KH-1 spy satellite series. It was the first satellite to achieve stabilization in orbit across all three axes and to be maneuvered on command from Earth. Although it did not carry film and thus did not perform any surveillance, Discoverer 2 was notable for being the first satellite equipped with a reentry capsule and the first to return a payload from orbit. Due to a timing error, the reentry capsule landed near Spitsbergen, Norway, instead of Hawaii. A joint recovery operation between the US and Norway was organized but ultimately unsuccessful, leading to concerns that the capsule might have fallen into Soviet hands, although these claims have never been substantiated. The flight and subsequent loss of Discoverer 2 inspired the book and film Ice Station Zebra.

Discoverer 2 "Goldcraft" launch cover postmarked at Lompoc on April 13, 1959.

(Reference from Discoverer 2)

1959-02-28 USA Discoverer 1

Discoverer 1 was the inaugural satellite in the CORONA reconnaissance satellite program. It was launched on a Thor-Agena A rocket on February 28, 1959, at 21:49:16 GMT from Vandenberg Air Force Base in California. Serving as a prototype for the KH-1 satellite, it did not carry a camera or a film capsule. Discoverer 1 aimed to achieve a polar orbit, making it the first satellite launched toward the South Pole, but ultimately failed in this endeavor.

Discoverer 1 launch cover from "H.Flick" postmarked at Vandenberg Air Force Base on February 28, 1959.

The Discoverer program was overseen by the Advanced Research Projects Agency (ARPA) of the U.S. Department of Defense and the U.S. Air Force. Its primary objective was to develop a film-return photographic surveillance satellite to evaluate the Soviet Union's production of long-range bombers and ballistic missiles, as well as their deployment locations. Additionally, it aimed to photograph areas over the Sino-Soviet bloc to supplement the Lockheed U-2 spy planes. The program was part of the secret CORONA initiative, which was also utilized to create maps and charts for the Department of Defense and other U.S. government mapping efforts. At the time, the true purpose of the program was not disclosed to the public; it was framed as an effort to launch large satellites to test subsystems and explore the communication and environmental challenges of sending humans into space, including transporting biological specimens for return to Earth. A total of 38 Discoverer satellites were launched by February 1962, though the satellite reconnaissance program continued under the CORONA project until 1972. The program's documents were declassified in 1995.

Discoverer 1 "Goldcraft" launch cover postmarked at Lompoc on February 28, 1959.

(Reference from Discoverer 1)