On this day in space! Oct. 28, 1971: Britain launches its 1st satellite Prospero into space on a Black Arrow rocket

On October 28, 1971, the United Kingdom marked a historic milestone by launching its very first satellite, Prospero, into space. Known also as the X-3, Prospero was not the UK's inaugural satellite but rather the maiden flight of its own rocket. Prior to this, all six British satellites were launched from the United States on NASA rockets. Prospero soared into orbit aboard the Black Arrow, a carrier rocket specially constructed for the mission. This was the fourth and final flight of the Black Arrow rocket.

Prospero's primary mission was to investigate the impact of the space environment on communications satellites. It was equipped with solar cells, telemetry systems, and a micrometeoroid detector, all designed to assess potential threats from tiny space particles. The satellite was attached to the rocket at Woomera Range Complex in Australia and successfully lifted off.

However, a collision with the rocket's final stage after separation slightly damaged one of Prospero's four radio antennas. Despite this, the satellite continued to function and remained operational until 1973.

The Black Arrow, a three-stage rocket, was the brainchild of Britain and stood 12.87 meters tall. The launch site, Woomera Range Complex in Australia, marked a significant moment in British spaceflight history. Prospero, a 66-kilogram research satellite, orbited the Earth in an elliptical path ranging from 522 km to 1,300 km altitude.

The rocket itself was based on the smaller Black Knight research rocket. Although the Black Arrow program concluded with two failures and two successes, Prospero remains the only British spacecraft launched using the British-built Black Arrow rocket.