Space

RemoveDebris to launch space cleanup demonstrator

RemoveDebris to launch space c...
The RemoveDebris satellite will test ways of collecting and disposing of space debris
The RemoveDebris satellite will test ways of collecting and disposing of space debris
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The RemoveDebris satellite will be deployed from the ISS
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The RemoveDebris satellite will be deployed from the ISS
Cubesat DS-1 launching from the RemoveDebris satellite 
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Cubesat DS-1 launching from the RemoveDebris satellite 
DS-1 deploying its balloon target
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DS-1 deploying its balloon target
DS-1 being captured by a net
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DS-1 being captured by a net
The harpoon experiment target
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The harpoon experiment target
The VBN experiment will test ways of rendezvousing with tumbling debris
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The VBN experiment will test ways of rendezvousing with tumbling debris
The RemoveDebris satellite will test ways of collecting and disposing of space debris
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The RemoveDebris satellite will test ways of collecting and disposing of space debris
Model of the DragSail
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Model of the DragSail
DragSail deployment mechanism
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DragSail deployment mechanism
Harpoon target assembly
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Harpoon target assembly
The net experiment package
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The net experiment package
Front view of the RemoveDebris satellite 
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Front view of the RemoveDebris satellite 
Diagram of the RemoveDebris satellite 
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Diagram of the RemoveDebris satellite 
The RemoveDebris satellite mission timeline
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The RemoveDebris satellite mission timeline
Artist's concept of the VBN experiment in action
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Artist's concept of the VBN experiment in action
VBN experiment package
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VBN experiment package

According to the Surrey Space Centre, there are some 7,000 tonnes (7,716 tons) of space debris circling the Earth, consisting of dead satellites, booster rocket stages, paint chips, and shrapnel from collisions. Whizzing in orbit at tens of thousands of miles per hour, even a small fragment could destroy a satellite. To help clean things up, the Centre has announced that it is leading a mission early next year to send the RemoveDebris demonstrator into orbit to test low-cost technologies that could be used to collect and remove space debris.

With the backing of the European Commission, the RemoveDebris mission is led by the Surrey Space Centre in partnership with Airbus, Surrey Satellite Technology Limited (SSTL) and others. It consists of a small cubical satellite based on the SSTL X-50 platform and is designed to carry four experimental payloads, cameras, and bays for two cubesats that will play the part of "debris."

If everything goes according to schedule, RemoveDebris will travel to the International Space Station in early 2017, where it will be launched into space. It will then move into a lower orbit, to carry out four experiments before re-entering the Earth's atmosphere to burn up.

Diagram of the RemoveDebris satellite 
Diagram of the RemoveDebris satellite 

Net Experiment

DS-1 being captured by a net
DS-1 being captured by a net

In the first experiment, a cubesat designated DS-1 will be released. As it travels away from the satellite, it will inflate a balloon, which will act as a deorbit device while providing a larger target for RemoveDebris to aim at. When it reaches a range of about seven meters (23 ft), a weighted net developed by Airbus will be fired at the Cubesat.

The net will wrap around the satellite and the balloon while cameras record the results. The balloon will slow the cubesat down until it re-enters the atmosphere, though in a real operation the "debris" would be snared by the clean-up satellite and towed away for disposal.

Vision-Based Navigation (VBN) Experiment

VBN experiment package
VBN experiment package

In this, the second cubesat (DS-2) will be released and two stereoscopic vision-based navigation (VBN) cameras and a Lidar system will track it. The purpose of this is to test VBN systems under space conditions as a way of rendezvousing with and capturing tumbling space debris, such as a damaged or derelict satellite.

Harpoon and Deployable Target Experiment

The harpoon experiment target
The harpoon experiment target

The third experiment is a harpoon, which is designed to impale debris for collection. In this case, the satellite will deploy a 10 x 10 cm (4 x 4 in) target on a boom sticking out 1.5 m (4.9 ft). The harpoon will fire at the target and a toggle will spring out to prevent it from slipping out again.

Dragsail Experiment

Model of the DragSail
Model of the DragSail

The final experiment involves the RemoveDebris satellite itself. When the other three experiments have been completed, it will release an umbrella-like mylar sail on carbon fiber booms and an inflation device will spread the sail out to a width of one meter (3.3 ft). Once in position, the sail will catch onto the tenuous remnants of the upper atmosphere and act like an airbrake in the same way as the balloon in the net experiment. The satellite will slow down, lose altitude, and eventually burn up on re-entry.

"Various orbits around the Earth that are commonly used for satellites and space missions are full of junk, which is a significant danger to our current and future spacecraft," says Dr Jason Forshaw, Surrey Space Centre project manager on the RemoveDebris team."Certain orbits – which are commonly used for imaging the earth, disaster monitoring and weather observation – are quickly filling up with junk, which could jeopardize the important satellites orbiting there. A future big impact between junk in that orbit could result in a real life 'Gravity-like' chain reaction of collisions. The international community needs to start working together now to remove space junk. The space around Earth is part of Earth's environment and keeping it clean is a common responsibility. Our mission, RemoveDebris, is one of the first concerted efforts to pioneer future technologies to remove space junk."

The RemoveDebris technology is on display at the Royal Society Summer Science Exhibition in London that runs until July 10.

The video below outlines the RemoveDebris mission.

Source: Surrey Space Centre

Summer Science Exhibition 2016: Cleaning up space junk

6 comments
Grunt
Okay, so what happens to the harpoon if it misses its target? Is it on a wire so it can be reeled back in for another go, or does it plunge down to Earth and spear a hapless pedestrian instead? Nevertheless, delighted someone is giving some serious thought to clearing up our space litter.
piperTom
Pet peeve, I suppose, but still... in the article, the estimate for space debris is "some 7,000 tonnes". This is cool, an estimate with one significant digit and meaning "probably closer to 7 than 8 or 6 thousands of tonnes". Then comes the conversion to English measure: 7,716 tons. Four significant digits! Do the English really have a much, much, much better guess than the metric guys?
fred_dot_u
While I applaud the efforts to clear earth orbit of litter, this proposal does not appear to have solutions for high-delta-v debris.
CharlieSeattle
China and the US should be made to pay for the entire effort now and what is to come FOR MAKING THE MESS. http://spacenews.com/41413us-state-department-china-tested-anti-satellite-weapon/ In January 2007, China deliberately destroyed one of its defunct weather satellites known as Fengyun-1C using a ground-based, medium-range ballistic missile. The action, which was widely condemned internationally, left a cloud of potentially hazardous debris in a heavily used belt of Earth orbit.
bobflint
ENJOY Space! It's a growing junkyard, not a play ground or garden.
Fenix_XR
This is good. They can "re-use" rocket bodies still floating around for other purposes on space stations... e.g rooms or storage portals. Send the larger rocket bodies to the moon for reuse as parts of a moon base..