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PROSPERO (BLACK ARROW) is classified as:

NORAD ID: 5580
Int'l Code: 1971-093A
Perigee: 533.2 km
Apogee: 1,292.1 km
Inclination: 82.0 °
Period: 103.1 minutes
Semi major axis: 7283 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  5580U 71093A   23275.48805918  .00005162  00000-0  11504-2 0  9997
2  5580  82.0379  75.5156 0520976 172.5024 188.4344 13.96622481611336
Source of the keplerian elements: AFSPC