About: Discoverer 27   Sponge Permalink

An Entity of Type : dbkwik:resource/G7YR4yAvfoe7I_ap4nmguQ==, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

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 Launch Complex 75-3-4 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 is

AttributesValues
rdf:type
rdfs:label
  • Discoverer 27
rdfs:comment
  • 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 Launch Complex 75-3-4 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 is
sameAs
dcterms:subject
dbkwik:nasa/proper...iPageUsesTemplate
spacecraft bus
Mission Duration
  • Failed to orbit
spacecraft type
Name
  • Discoverer 27
Manufacturer
  • Lockheed
Operator
launch site
Mission Type
  • Optical reconnaissance
apsis
  • gee
orbit regime
launch rocket
  • Thor DM-21 Agena-B 322
Launch date
  • --07-21
orbit epoch
  • Planned
orbit reference
abstract
  • 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 Launch Complex 75-3-4 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 kilogram (lb). It was equipped with a frame camera with a focal length of millimetre (in), which had a maximum resolution of metre (ft). The camera would have recorded images onto -millimeter () film, which would have been returned in a Satellite Recovery Vehicle, before the satellite ceased operations. The Satellite Recovery Vehicle carried by Discoverer 27 was SRV-524.
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