SWISS CRAFT JANITOR SATELLITES TO GRAB SPACE JUNK
Swiss scientists said Wednesday they plan to launch a “janitor satellite” specially designed to get rid of space junk, the orbiting debris that can do serious and costly damage to valuable satellites or even manned space ships.
The 10-million-franc ($11-million) satellite called CleanSpace One — the prototype for a family of such satellites — is being built by the Swiss Space Center at the Swiss Federal Institute for Technology in Lausanne, or EPFL.
Its launch would come within three to five years and its first tasks will be to grab two Swiss satellites that were launched in 2009 and 2010 but will be phased out of use, EPFL said. The U.S. space agency NASA says over 500,000 pieces of spent rocket stages, broken satellites and other debris are orbiting Earth. The debris travels at speeds approaching 17,500 miles per hour (28,000 kilometers per hour), fast enough to destroy or inflict expensive and time-draining damage on a satellite or spacecraft. Collisions, in turn, generate more fragments floating in space.
“It has become essential to be aware of the existence of this debris and the risks that are run by its proliferation,” said Claude Nicollier, an astronaut and EPFL professor. Building the satellite means developing new technology to address three big problems, scientists say.
The first hurdle has to do with trajectory: The satellite has to be able to adjust its path to match that of its target. EPFL said its labs are looking into a new ultra-compact motor that can do this.
Next, the satellite has to be able to grab hold of and stabilize the debris at high speeds. Scientists are studying how plants and animals grip things as a model for what would be used. And, finally, CleanSpace One then has to be able to guide the debris, or unwanted satellites, back into Earth’s atmosphere, where both the Swiss-made satellite and the floating garbage it collects would burn on re-entry.
The Swiss Space Center’s director, Volker Gass, said it hopes to someday “offer and sell a whole family of ready-made systems, designed as sustainably as possible, that are able to de-orbit several different kinds of satellites.”
It remains to be seen how cost-effective the satellites are since each one would be destroyed after its mission, but governments might provide some funding if governments agree to rules to limit debris.
For the full article: Mail Times
