Discoverer 12

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Discoverer 12
KH-1 CORONA.jpg
Mission typeOptical reconnaissance
Operator US Air Force / NRO
Harvard designation1960-F08
SATCAT no. F00104
Spacecraft properties
Spacecraft type CORONA KH-1
Bus Agena-A
Manufacturer Lockheed
Launch mass790 kilograms (1,740 lb)
Start of mission
Launch date29 Jun 1960 22:00:44 (1960-06-29UTC22:00:44Z) GMT
Rocket Thor DM-21 Agena-A
(Thor 160)
Launch site Vandenberg LC 75-3-4
End of mission
Decay date29 Jun
 

Discoverer 12 was an American optical reconnaissance satellite launched on 29 June 1960, at 22:00:44 GMT. The fourth of five test flights of the Corona KH-1 spy satellite series was lost when the second stage failed during launch.

Contents

Background

Thor Agena A with Discoverer 12, 29 June 1960 Thor Agena A with Discoverer 12, 29 June 1960.gif
Thor Agena A with Discoverer 12, 29 June 1960

"Discoverer" was the civilian designation and cover for the Corona satellite photo-reconnaissance series of satellites managed by the Advanced Research Projects Agency of the Department of Defense and the U.S. Air Force. The primary goal of the satellites was to replace the U-2 spyplane in surveilling the Sino-Soviet bloc, determining the disposition and speed of production of Soviet missiles, and assessing long-range bombers. The Corona program was also used to produce maps and charts for the Department of Defense and other US government mapping programs. [1]

The first series of Corona satellites were the Keyhole 1 (KH-1) satellites based on the Agena-A upper stage, which not only offered housing but whose engine provided attitude control in orbit. The KH-1 payload included the C (for Corona) single, vertical-looking, panoramic camera that scanned back and forth, exposing its film at a right angle to the line of flight. [2] :26 The camera, built by Fairchild Camera and Instrument with a f/5.0 aperture and 61 centimetres (24 in) focal length, had a ground resolution of 12.9 metres (42 ft). Film was returned from orbit by a single General Electric Satellite Return Vehicle (SRV) constructed by General Electric. The SRV was equipped with an onboard small solid-fuel retromotor to deorbit at the end of the mission. Recovery of the capsule was done in mid-air by a specially equipped aircraft. [3]

The Discoverer program began with a series of three test flights whose satellites carried no cameras, all launched in the first half of 1959. There followed eight operational Discoverer satellites, all of them partial or complete failures, [4] :236 though Discoverer 11, launched on 15 April 1960, carrying a new vacuum-resistant film, was the first mission on which the onboard camera worked properly. After the failure of Discoverer 11 on reentry, caused by the explosion of its spin motor, it was decided that the following mission would be a diagnostic flight to determine the causes of the various issues plaguing the program.

Spacecraft

The battery-powered [3] satellite, like prior Discoverers, was housed in an Agena-A stage and composed of a satellite bus and SRV. Discoverer 12 was largely identical to Discoverer 8; however, instead of mounting the "C" (for Corona) surveillance camera, the SRV contained extra telemetry. The SRV included a doppler beacon and external lights for tracking purposes. The combination of bus and SRV weighted 781 kilograms (1,722 lb), with the SRV alone weighing 136 kilograms (300 lb) [5] [6] Discoverer 12 also carried a newly developed gas motor for spin stabilization to replace the system that had caused the loss of Discoverer 11. [4] :59

Mission

Launched on 29 Jun 1960 at 22:00:44 GMT from Vandenberg LC 75-3-4 by a Thor DM-21 Agena-A rocket, [7] the mission ended in failure when the Agena second stage malfunctioned. [4] :59

Legacy

Though Discoverer 12 was a loss, Corona engineers had confidence in the new spin motor as well as the previously demonstrated film. In fact, the following test mission, Discoverer 13, was a complete success and paved the way for the first fully successful flight, Discoverer 14, launched on August 18, 1960. [4] :59 The Corona program went on to comprise 145 flights in eight satellite series, the last mission launching on 25 May 1972. [4] :245 CORONA was declassified in 1995, [4] :14 and a formal acknowledgement of the existence of US reconnaissance programs, past and present, was issued in September 1996. [4] :4

Related Research Articles

<span class="mw-page-title-main">CORONA (satellite)</span> American reconnaissance satellites (1959–1972)

The Corona program was a series of American strategic reconnaissance satellites produced and operated by the Central Intelligence Agency (CIA) Directorate of Science & Technology with substantial assistance from the U.S. Air Force. The CORONA satellites were used for photographic surveillance of the Soviet Union (USSR), China, and other areas beginning in June 1959 and ending in May 1972.

<span class="mw-page-title-main">KH-5 Argon</span> Series of reconnaissance satellites produced by the United States

KH-5 ARGON was a series of reconnaissance satellites produced by the United States from February 1961 to August 1964. The KH-5 operated similarly to the CORONA series of satellites, as it ejected a canister of photographic film. At least 12 missions were attempted, but at least 7 resulted in failure. The satellite was manufactured by Lockheed. Launches used Thor-Agena launch vehicles flying from Vandenberg Air Force Base, with the payload being integrated into the Agena.

<span class="mw-page-title-main">Samos (satellite)</span> Series of reconnaissance satellites for the United States

The SAMOS or SAMOS-E program was a relatively short-lived series of reconnaissance satellites for the United States in the early 1960s, also used as a cover for the initial development of the KH-7 GAMBIT system. Reconnaissance was performed with film cameras and television surveillance from polar low Earth orbits with film canister returns and transmittals over the United States. SAMOS was first launched in 1960 from Vandenberg Air Force Base.

<span class="mw-page-title-main">Discoverer 14</span> American reconnaissance satellite

Discoverer 14, also known as Corona 9009, was a spy satellite used in the Corona program managed by Advanced Research Projects Agency (ARPA) of the Department of Defense and the United States Air Force. On 19 August 1960, usable photographic film images of the Soviet Union taken by the satellite were recovered by a C-119 recovery aircraft. This was the first successful recovery of film from an orbiting satellite and the first mid-air recovery of an object returning from Earth orbit.

<span class="mw-page-title-main">Discoverer 13</span> American reconnaissance satellite

Discoverer 13 was an American optical reconnaissance satellite launched on 10 Aug 1960 at 20:37:54 GMT. The last of five test flights of the Corona KH-1 spy satellite series, it was the first fully successful flight in the Discoverer series. On 11 Aug, after 17 orbits, the satellite's reentry capsule was recovered in the Pacific Ocean by the Haiti Victory. Its payload, an American flag, was presented to President Eisenhower four days later.

<span class="mw-page-title-main">Discoverer 11</span> Reconnaissance satellite

Discoverer 11, also known as Corona 9008, was an American optical reconnaissance satellite launched on 15 Apr 1960 at 20:30:37 GMT. The eighth of ten operational flights of the Corona KH-1 spy satellite series, it successfully employed the first space-worthy camera film; however, Discoverer's film return capsule was lost during reentry on 16 Apr when the satellite's spin motors exploded.

Discoverer 23, also known as KH-5 9016A, was a USAF photographic reconnaissance satellite under the supervision of the National Reconnaissance Office (NRO) which was launched in 1961. It was a KH-5 ARGON satellite, based on an Agena-B. It was the second KH-5 mission to be launched, and the second to end in failure.

<span class="mw-page-title-main">Discoverer 17</span> Reconnaissance satellite

Discoverer 17, also known as Corona 9012, was an American optical reconnaissance satellite launched on 12 November 1960 at 20:38:00 GMT. It was the second of ten Corona KH-2 satellites, based on the Agena-B.

<span class="mw-page-title-main">Discoverer 18</span> Reconnaissance satellite

Discoverer 18, also known as Corona 9013, was an American optical reconnaissance satellite launched on 7 December 1960 at 20:24:00 GMT. It was the first successful, and the third of ten total Corona KH-2 satellites, based on the Agena-B.

<span class="mw-page-title-main">Discoverer 34</span> Reconnaissance satellite

DISCOVERE 34, also known as CORONA 9027, was a United States optical reconnaissance satellite which was launched on 5 November 1961. It was the ninth of ten CORONA KH-2 satellites, based on the Agena B.

<span class="mw-page-title-main">Discoverer 4</span> American reconnaissance satellite

Discoverer 4, also known as Corona 9001, was an American optical reconnaissance satellite launched on 25 Jun 1959 at 22:47:45 GMT, the first of ten operational flights of the Corona KH-1 spy satellite series, and the first satellite to be equipped for photo surveillance. The satellite was not successfully orbited. Its loss spurred improvements of its rocket booster to ensure the success of subsequent missions.

<span class="mw-page-title-main">Discoverer 9</span> Reconnaissance satellite

Discoverer 9, also known as Corona 9006, was an American optical reconnaissance satellite launched on 4 Feb 1960 at 18:51:45 GMT, the sixth of ten operational flights of the Corona KH-1 spy satellite series, and the first of them to be equipped with a new, vacuum-proof, polyester-based film. The satellite was not successfully orbited.

<span class="mw-page-title-main">Discoverer 10</span> Reconnaissance satellite

Discoverer 10, also known as Corona 9007, was an American optical reconnaissance satellite launched on 19 Feb 1960 at 20:15:14 GMT, the seventh of ten operational flights of the Corona KH-1 spy satellite series.

<span class="mw-page-title-main">Discoverer 2</span> American reconnaissance satellite

Discoverer 2 was an American optical reconnaissance satellite launched on 13 April 1959 at 21:18:39 GMT, the second of three test flights of the Corona KH-1 spy satellite series. Discoverer 2 was the first satellite to be stabilized in orbit in all three axes and to be maneuvered on command from the earth. Though it carried no film and thus conducted no surveillance, Discoverer 2 was both the first satellite equipped with a reentry capsule and the first to return a payload from orbit. A timing error caused the reentry capsule to land near the island of Spitsbergen, Norway, rather than Hawaii. A joint US-Norway recovery operation was mounted, but was unsuccessful, and there was fear that the capsule ended in the possession of the Soviet Union. Such claims have never been verified. The flight and loss of Discoverer 2 was the inspiration for the book and film Ice Station Zebra.

<span class="mw-page-title-main">Discoverer 3</span> American reconnaissance satellite

Discoverer 3 was an American optical reconnaissance satellite launched on 3 June 1959 at 20:09:20 GMT, the third of three test flights of the Corona KH-1 spy satellite series. The first Discoverer mission to carry live animal passengers, Discoverer 3 was lost when its carrying Agena-A booster crashed into the Pacific Ocean.

<span class="mw-page-title-main">Discoverer 5</span> Reconnaissance satellite

Discoverer 5, also known as Corona 9002, was an American optical reconnaissance satellite launched on 13 August 1959 at 19:00:08 GMT, the second of ten operational flights of the Corona KH-1 spy satellite series. Though the satellite was successfully orbited, the onboard camera failed within the first orbit, and the film-return capsule failed to deorbit as planned.

<span class="mw-page-title-main">Discoverer 6</span> Reconnaissance satellite

Discoverer 6, also known as Corona 9003, was an American optical reconnaissance satellite launched on 19 August 1959 at 19:24:44 GMT, the third of ten operational flights of the Corona KH-1 spy satellite series. Though the spacecraft was orbited successfully, the onboard camera ceased operating by the second orbit, and the film-return capsule could not be recovered.

<span class="mw-page-title-main">Discoverer 7</span> Reconnaissance satellite

Discoverer 7, also known as Corona 9004, was an American optical reconnaissance satellite launched on 7 November 1959 at 20:28:41 GMT, the fourth of ten operational flights of the Corona KH-1 spy satellite series. Though the satellite was orbited successfully, its film capsule failed to separate from the main satellite.

<span class="mw-page-title-main">Discoverer 8</span> Reconnaissance satellite

Discoverer 8, also known as Corona 9005, was an American optical reconnaissance satellite launched on 20 November 1959 at 19:25:24 GMT, the fifth of ten operational flights of the Corona KH-1 spy satellite series. Overburn by the carrier rocket placed the satellite in a higher apogee, more eccentric orbit than planned, the camera failed to operate, and the film return capsule was lost on reentry after separation from the main satellite on 21 November.

<span class="mw-page-title-main">Discoverer 15</span> Reconnaissance satellite of the United States Air Force

Discoverer 15, also known as Corona 9010, was a spy satellite used in the Corona program managed by Advanced Research Projects Agency (ARPA) of the Department of Defense and the United States Air Force. Launched on 13 September 1960, the satellite took reconnaissance photos of the Soviet Union. However, its recoverable film capsule was lost in the Pacific Ocean after reentry outside the recovery zone on 15 September.

References

  1. "Discoverer 1". NASA Space Science Data Coordinated Archive. Retrieved 24 October 2020.
  2. "Corona: America's First Satellite Program" (PDF). Central Intelligence Agency. 1995. Archived from the original (PDF) on June 12, 2007. Retrieved 25 January 2020.
  3. 1 2 Krebs, Gunter. "KH-1 Corona". Gunter's Space Page. Retrieved 7 November 2020.
  4. 1 2 3 4 5 6 7 Day, Dwayne A.; Logsdon, John M.; Latell, Brian (1998). Eye in the Sky: The Story of the Corona Spy Satellites. Washington and London: Smithsonian Institution Press. ISBN   1-56098-830-4. OCLC   36783934.
  5. "Discoverer 12". NASA Space Science Data Coordinated Archive. Retrieved 14 December 2020.
  6. "Discoverer 13". NASA Space Science Data Coordinated Archive. Retrieved 14 December 2020.
  7. McDowell, Jonathan. "Launch Log". Jonathon's Space Report. Retrieved 7 November 2020.