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PROSPERO (BLACK ARROW) is classified as:

NORAD ID: 5580
Int'l Code: 1971-093A
Perigee: 535.2 km
Apogee: 1,302.9 km
Inclination: 82.0 °
Period: 103.2 minutes
Semi major axis: 7290 km
RCS: 0.949 m2 (medium)
Launch date: October 28, 1971
Source: United Kingdom (UK)
Launch site: WOOMERA (WOMRA)

Prospero was a British scientific satellite launched from the Woomera site in Australia aboard a Black Arrow rocket. It was used to test equipment for future satellites and to conduct a scientific experiment to measure the incidence of micrometeoroids. It had an external shape similar to a pumpkin, with an equatorial diameter of 1.2 m and a height of 0.7 m. Its anticipated life was 100 years. This launch made the United Kingdom the sixth nation to put a satellite into orbit on its own rocket.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 05580U 71093A   21341.61149776  .00000222  00000-0  47964-4 0  9990
2 05580  82.0407 292.3515 0526538 257.9689  96.2023 13.94787627517653
Source of the keplerian elements: AFSPC