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
  • spaceflight
    • 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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