Swiss 'janitor satellite' would clean up space junk
With more debris in space than ever, companies and countries are looking for ways to protect their satellites.
Wed, Feb 15 2012 at 2:48 PM
CLEAN UP ON AISLE EARTH: The CleanSpace One satellite will approach a defunct satellite, grab it, and plunge into Earth's atmosphere, burning up during re-entry. (Photo: ESA/NASA)
Earth is surrounded by a cloud of more than half a million pieces of space junk, from bus-size spent rocket stages to tiny flecks of paint. Orbiting at breakneck speeds, every last bit poses grave dangers — and means huge insurance premiums — for operational satellites, and it threatens the International Space Station, too. Every time two orbiting objects collide, they break up into thousands more pieces of debris.
To combat this growing headache, Swiss scientists and engineers have announced the launch of CleanSpace One, a project to build the first in a family of “janitor” satellites that will help clean up space.
To be launched as soon as three to five years from now, CleanSpace One will rendezvous with one of two defunct objects in orbit, either the Swisscube picosatellite, or its cousin TIsat, both 1,000 cubic centimeters (61 cubic inches) in size. When the janitor satellite reaches its target, it will extend a grappling arm, grab it and then plunge into Earth’s atmosphere, burning up itself and the space junk during re-entry.
CleanSpace One is being designed and built at the Swiss Space Center, part of the Swiss Federal Institute for Technology in Lausanne, or EPFL. Scientists there are developing the micro- and electric propulsion systems that will enable CleanSpace One to grab hold of space junk as the two objects zip around Earth at 17,500 mph (28,000 kph).
“The [main] challenge will be having a deployment either of a robotic arm or a deployment of a mechanism that will embrace or grab exactly Swisscube,” EPFL scientist Muriel Richard said in a press video. The design team is drawing inspiration from the grabbing mechanisms of living organisms, she said.
Eventually, the team hopes to offer and sell a whole suite of ready-made systems designed to de-orbit space junk of various sizes.“Space agencies are increasingly finding it necessary to take into consideration and prepare for the elimination of the stuff they’re sending into space. We want to be the pioneers in this area,” Swiss Space Center Director Volker Gass said.
Smaller systems like CleanSpace One will be low-cost, Richard said. “It’s not a multimillion development, it’s a university based development.”
There may indeed be a market for such janitor satellites. In 2009, the American Iridium satellite collided with debris from an inactive Russian satellite, producing roughly 2,000 more pieces of debris, some of which went on to destroy a satellite worth $55 million. The more junk accumulates, the more likely collisions between satellites and debris will become, with each collision causing a proliferation of debris.
“There’s going to be an avalanche effect and more and more satellites are going to be kicked out or destroyed in orbit,” Gass said. Higher risk of impact means higher insurance premiums, and the cost of insuring today’s active satellites is around $20 billion.
Falling space debris even poses a slight risk of injuring people on Earth. [What Are the Odds You'll Get Struck by a Falling Satellite?]
Claude Nicollier, an astronaut and EPFL professor, compared the space junk problem with global warming. “In a way, there’s some similarity between the two problems,” he said. “If we don’t do anything, we’ll have big problems in the future.”
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