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Discoverer 27, also known as Corona 9020A, was an American 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. The failure was traced to an open circuit in the guidance programmer.

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  • Discoverer 27 (en)
  • Discoverer 27 (pl)
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  • Discoverer 27, also known as Corona 9020A, was an American 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. The failure was traced to an open circuit in the guidance programmer. (en)
  • Discoverer 27 – amerykański satelita wywiadowczy. Stanowił część tajnego . Należał do serii tego programu. Start, który odbył się z kosmodromu Vandenberg, w dniu 21 lipca 1961, o godzinie 22:35 GMT, nie powiódł się. Rakieta Thor Agena B wraz z satelitą uległa samodestrukcji w sześćdziesiątej sekundzie lotu na rozkaz oficera bezpieczeństwa. Rozkaz został wydany, gdyż rakieta nabrała nieplanowanego, dużego przechyłu zagrażającego bezpieczeństwu na Ziemi. Niepowodzenie to oznaczono w katalogu COSPAR jako 1961-F07. (pl)
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  • Discoverer 27 (en)
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  • Discoverer 27 (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Thor_Agena_B_with_Discoverer_27_(Jul._21,_1961).gif
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  • Thor DM-21 Agena-B 322 (en)
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  • Failed to orbit (en)
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  • Optical reconnaissance (en)
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  • Discoverer 27, also known as Corona 9020A, was an American 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. The launch of Discoverer 27 occurred at 22:35 UTC on 21 July 1961. A Thor DM-21 Agena-B rocket was used, flying from at the Vandenberg Air Force Base. The booster began exhibiting abnormal pitch gyrations within seconds of liftoff, which worsened during flight and eventually exceeded its design limits. At T+59 seconds, the Agena disintegrated due to either structural loads or inadvertent activation of the range safety destruct charges. The Thor's engine shut down due to loss of electrical power caused by damage to the forward section of the vehicle. Twenty seconds later, the Thor exploded and all telemetry data ceased, although the telemetry transmitter continued operating until 300 seconds after launch, likely at the point where water impact occurred. Range Safety issued the destruct command at T+94 seconds, but only as a formality and there was no indication that it did anything. The failure was traced to an open circuit in the guidance programmer. Discoverer 27 was designed to operate in a low Earth orbit, and had a mass of 1,150 kilograms (2,540 lb). It was equipped with a with a focal length of 76 millimetres (3.0 in), which had a maximum resolution of 140 metres (460 ft). The camera would have recorded images onto 127-millimeter (5.0 in) film, which would have been returned in a , before the satellite ceased operations. The Satellite Recovery Vehicle carried by Discoverer 27 was SRV-524. (en)
  • Discoverer 27 – amerykański satelita wywiadowczy. Stanowił część tajnego . Należał do serii tego programu. Start, który odbył się z kosmodromu Vandenberg, w dniu 21 lipca 1961, o godzinie 22:35 GMT, nie powiódł się. Rakieta Thor Agena B wraz z satelitą uległa samodestrukcji w sześćdziesiątej sekundzie lotu na rozkaz oficera bezpieczeństwa. Rozkaz został wydany, gdyż rakieta nabrała nieplanowanego, dużego przechyłu zagrażającego bezpieczeństwu na Ziemi. Niepowodzenie to oznaczono w katalogu COSPAR jako 1961-F07. Satelita był własnością amerykańskiego wywiadu (dzisiejszej CIA), a zbudowała go firma Lockheed Martin. Inne nazwy misji to: Corona 27, CORONA 9020A, KH-5 9020, Agena B 1110, FTV-1110. Oznaczeniem kapsuły powrotnej było SRV 524. (pl)
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