Mission type | Optical reconnaissance |
---|---|
Operator | US Air Force / NRO |
Harvard designation | 1959 GAM |
COSPAR ID | 1959-003A |
SATCAT no. | S00014 |
Mission duration | 1 day |
Spacecraft properties | |
Spacecraft type | CORONA Test Vehicle |
Bus | Agena-A |
Manufacturer | Lockheed |
Launch mass | 784 kilograms (1,728 lb) after orbital insertion |
Start of mission | |
Launch date | 13 April 1959 21:18:39 GMT |
Rocket | Thor DM-21 Agena-A (Thor 170) |
Launch site | Vandenberg LC 75-3-4 |
End of mission | |
Last contact | 14 April 1959 |
Decay date | 26 April 1959 |
Landing date | 13 April 1959 (SRV) |
Landing site | Over Spitzbergen (SRV) |
Orbital parameters | |
Reference system | Geocentric |
Regime | Low Earth |
Eccentricity | 0.00801 |
Perigee altitude | 239 kilometers (149 mi) |
Apogee altitude | 346 kilometers (215 mi) |
Inclination | 89.9° |
Period | 90.40 minutes |
Epoch | 13 April 1959 21:21:00 |
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 Spitzbergen, 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.
"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 long-range bombers assess. 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 retro motor to deorbit at the end of the mission. Recovery of the capsule was done in mid-air by a specially equipped aircraft. [3]
Discoverer 2 was the second in a series of three camera-less test flights preceding operational KH-1 flights. [4] Its immediate predecessor, Discoverer 1, which carried neither camera nor film capsule, was launched 28 February 1959 after a failed attempt on 21 January 1959. [5]
The battery-powered [4] Discoverer 2 was a cylindrical satellite 1.5 metres (4 ft 11 in) in diameter, 5.85 metres (19.2 ft) long and had a mass after second stage separation, including propellants, of roughly 3,800 kilograms (8,400 lb). [1] After orbital insertion, the satellite and SRV together massed 784 kilograms (1,728 lb). [6] : 236
Instead of a camera and film, Discoverer 2's recovery package included cosmic-ray film packs to determine the intensity and composition of cosmic radiation. This emulsion experiment comprised two groups of films arranged horizontally and vertically to measure the intensity and direction of cosmic radiation and to distinguish among electrons, protons, and heavier charged particles. A metallic Bismuth detector was designed to register induced changes in its sensors from which changes in neutral density could be derived to prevent overexposure in later, photographic missions. [1]
In addition, the spacecraft carried test life support equipment [1] and a "mechanical mouse," a small biomedical payload. [6] : 52
The capsule was designed to be recovered by a specially equipped aircraft during parachute descent, but was also designed to float to permit recovery from the ocean. The main spacecraft contained a telemetry transmitter and a tracking beacon. The telemetry could transmit over 100 measurements of the spacecraft performance, including 28 environmental, 34 guidance and control, 18 second stage performance, 15 communications, and 9 reentry capsule parameters. Electrical power for all instruments was provided by NiCd batteries. Orientation was provided by a cold nitrogen gas jet-stream system, a scanner for pitch attitude, and an inertial reference package for yaw and roll data. [1]
Launched on 13 April 1959 at 21:18:39 GMT from Vandenberg LC 75-3-4 [7] into a 239 kilometres (149 mi) x 346 kilometres (215 mi) polar orbit by a Thor-Agena A booster, Discoverer 2 was three-axis stabilized and was commanded from Earth. After 17 orbits, on 14 April 1959, a reentry vehicle was ejected. The reentry vehicle separated into two sections, one consisting of the protection equipment, retrorocket and main structure and the other the reentry capsule. It was planned that the capsule would reenter over the vicinity of Hawaii for recovery, [1] but a timer malfunction caused by human programming error lead to premature capsule ejection and reentry near the Norwegian island of Spitsbergen, whose residents observed both the SRV's fiery descent as well as its colorful parachute.
Though Norway was a Western ally and a member of NATO, the Soviet Union, which shared a border with the Scandinavian country, [8] had a lease to operate several mining facilities on the island. The Air Force was thus vague when it announced that the Hawaiian capsule recovery had been canceled and that, instead, the SRV would be picked up somewhere in "the arctic."
With the aid of Norwegian troops, the Air Force mounted an intensive search for the SRV but was unable to find it, and the search was called off on April 22. At least one post-action memo reported evidence that Discoverer 2's capsule had fallen into the possession of the Soviet Union (ski tracks near the impact zone), [9] : 89 which could have provided limited intelligence to the Soviet government. This memo has been disputed, and the fate of Discovery 2's SRV remained unknown as of 1998. [6] : 53 The incident became the basis for the book and movie Ice Station Zebra . [6] : 252
Though the SRV recovery was a failure, Discoverer 2 was the first satellite to be stabilized in orbit in all three axes, to be maneuvered on command from the earth, to separate a reentry vehicle on command, and to send its reentry vehicle back to earth. The main instrumentation payload remained in orbit and carried out vehicular performance and communications tests, successfully gathering data on propulsion, communications, orbital performance, and stabilization. All equipment functioned as programmed except the timing device. Satellite telemetry functioned until April 14, 1959, and the main tracking beacon functioned until April 21, 1959. [1] The satellite bus reentered on 26 April 1959. [10]
CORONA began operational flights on 25 Jun 1959 with the launch of Discoverer 4 [6] : 54 and achieved its first fully successful flight with the mission of Discoverer 14, launched on August 18, 1960. [6] : 59 The program ultimately comprised 145 flights in eight satellite series, the last mission launching on 25 May 1972. [6] : 245 CORONA was declassified in 1995, [6] : 14 and a formal acknowledgement of the existence of US reconnaissance programs, past and present, was issued in September 1996. [6] : 4
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.
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.
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.
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.
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 20, also known as KH-5 9014A, was a USAF photographic reconnaissance satellite under the supervision of the National Reconnaissance Office (NRO) which was launched in 1961. Discoverer 20 was the first KH-5 ARGON satellite to be launched.
Discoverer 27, also known as Corona 9020A, was an American area survey optical reconnaissance satellite launched in 1961, but which failed to achieve orbit. It was a KH-5 Argon satellite, based on an Agena-B. It was the fourth KH-5 to be launched, the second consecutive KH-5 launch failure, and the fourth consecutive KH-5 mission failure.
FTV-1132, also known as the Corona 9042A, was an American area survey optical reconnaissance satellite which was launched in 1962. It was a KH-5 Argon satellite, based on an Agena-B. The satellite operated successfully, but its film capsule was lost during recovery due to a parachute failure.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.