About: Discoverer 21   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 21 occurred at 22:58 UTC on 18 February 1961. A Thor DM-21 Agena-B rocket was used, flying from launch pad 75-3-5 at the Vandenberg Air Force Base. Upon successfully reaching orbit, it was assigned the Harvard designation 1961 Zeta 1.

AttributesValues
rdf:type
rdfs:label
  • Discoverer 21
rdfs:comment
  • The launch of Discoverer 21 occurred at 22:58 UTC on 18 February 1961. A Thor DM-21 Agena-B rocket was used, flying from launch pad 75-3-5 at the Vandenberg Air Force Base. Upon successfully reaching orbit, it was assigned the Harvard designation 1961 Zeta 1.
sameAs
dcterms:subject
dbkwik:nasa/proper...iPageUsesTemplate
Harvard designation
  • 1961(xsd:integer)
spacecraft bus
Name
  • Discoverer 21
Manufacturer
  • Lockheed
orbit period
  • 5844.0
orbit inclination
  • 80(xsd:double)
Operator
decay date
  • 1962-04-20(xsd:date)
launch site
  • Vandenberg LC-1 launch pad 75-3-5
Mission Type
  • Technology
apsis
  • gee
orbit regime
launch rocket
  • Thor DM-21 Agena-B 261
Launch date
  • --02-18
orbit reference
abstract
  • The launch of Discoverer 21 occurred at 22:58 UTC on 18 February 1961. A Thor DM-21 Agena-B rocket was used, flying from launch pad 75-3-5 at the Vandenberg Air Force Base. Upon successfully reaching orbit, it was assigned the Harvard designation 1961 Zeta 1. Discoverer 21 was operated in a low Earth orbit, with a perigee of kilometre (mi), an apogee of kilometre (mi), 80.7 degrees of inclination, and a period of 97.4 minutes. The satellite had a mass of kilogram (lb), and was used to demonstrate an engine restart, and to test infrared sensors for the Midas programme. It remained in orbit until 20 April 1962, when it decayed and reentered the atmosphere.
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