Dstl scientists tackle growing problem of space junk

UK scientists at the Defence Science and Technology Laboratory (Dstl) are leading an innovative experiment to tackle the growing problem of space junk.

Hundreds of thousands of manmade objects orbit the Earth, but fewer than 5,000 are operational satellites. The most congested area sits within 2,000 kilometres of the Earthโ€™s surface, known as low Earth orbit (LEO), where collisions can cause further debris. If this problem is not addressed, space junk threatens to make space exploration and satellite launches impossible.ย It also poses a hazard to existing satellites, which make an important contribution to the UKโ€™s military capability.

To tackle this problem, theย Inter-Agency Space Debris Coordination Committeeย (IADC) has proposed that all LEO satellites should be de-orbited within 25 years.

However, the traditional de-orbiting rocket method is expensive. As part of a large collaboration with industry, government and academia, Dstl space scientists are leading in exploring alternative methods.

The Daedalus experiment โ€“ part of the Space Situational Awareness Project in Dstlโ€™s Space Programme โ€“ is exploring the effect on satellites of so-called Icarus โ€˜de-orbit sailsโ€™, made of 25 micrometre-thick aluminium-coated Kapton, a high heat-resistant polyimide film. When deployed, the sail increases drag, causing a controlled descent into the Earthโ€™s atmosphere where the satellite will burn up.

Sean Murphy, a Principal Scientist in Dstlโ€™s Space Programme, said:

โ€œItโ€™s vitally important that we remove satellites that have reached end of life so they donโ€™t remain in orbit as pieces of space junk. Space junk clutters up the space environment and ultimately pose a hazard to the useful satellites we rely on.โ€

Announcing the experiment at theย first meeting of the Defence External Innovation Advisoryย Panel, the Minister for Defence Procurement, Harriett Baldwin, said:

โ€œOur ยฃ800 million Innovation Initiative will help our Armed Forces maintain their edge into the future, where ever-evolving technologies present new challenges and opportunities. Thatโ€™s why we have committed to spending 1.2% of our ยฃ36 billion growing defence budget on science and technology.

โ€œThe Innovation Panel will help meet the complex challenges of the 21st Century, while delivering the high-wage, high-skills jobs of the future; and itโ€™s particularly fitting that we welcome astronaut Major Tim Peake as I announce the UKโ€™s leading role in cutting-edge satellite research.โ€

The first Daedalus trial has just started. A Canadian satellite, known as CanX-7, deployed its de-orbiting sail in early May 2017 and is expected to burn up in the Earthโ€™s atmosphere in around two yearsโ€™ time. Two other satellites, TechDemoSat-1 (TDS1) and Carbonite-1 (CBNT1), have been fitted with Icarus de-orbit sails created by Cranfield University and are expected to start their descents later this year.

The experiment results will help to characterise changes in the brightness of the satellite caused by the sail deployment, quantify the drag increase that is due to the de-orbit sail, and critically compare different orbital dynamics models. Dstl is leading co-ordination of the UK element, tasking sensors to collect data to support this experiment. Of particular relevance to the military community is the effect that such high-drag satellites have on current space situational awareness sensors and processing.

A video of Sean Murphy talking about the problem of space junk can be foundย here.

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