Discoverer 21
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| Launch date | February 18, 1961 |
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| ID | 4041772 |
About Discoverer 21
Discoverer 21, also known as RM-2, was an American satellite which was launched in 1961. It was a technology demonstration spacecraft, based on an Agena-B. The launch of Discoverer 21 occurred at 22:58 UTC on 18 February 1961.