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Japan Sends Its New Space Junk-Fighting Technology To The ISS (phys.org)
What floats 249 miles in the sky, stretches 2,300 feet, and took over 10 years to develop?
An anonymous reader quotes Phys.org:
Japan launched a cargo ship Friday bound for the International Space Station, carrying a
"space junk" collector that was made with the help of a fishnet company... Researchers are using a so-called electrodynamic tether made from thin wires of stainless steel and aluminum... The electricity generated by the tether as it swings through the Earth's magnetic field is expected to have a slowing effect on the space junk, which should, scientists say, pull it into a lower and lower orbit. Eventually the detritus will enter the Earth's atmosphere, burning up harmlessly long before it has a chance to crash to the planet's surface.
Bloomberg has some interesting background: The experiment is part of an international cleanup effort planning to safeguard astronauts and about $900 billion worth of space stations, satellites and other infrastructure... Satellite collisions and testing of anti-satellite weapons have added thousands of debris fragments in the atmosphere since 2007, according to NASA... With debris traveling at up to 17,500 miles an hour, the impact of even a marble-size projectile can cause catastrophic damage.
Bloomberg has some interesting background: The experiment is part of an international cleanup effort planning to safeguard astronauts and about $900 billion worth of space stations, satellites and other infrastructure... Satellite collisions and testing of anti-satellite weapons have added thousands of debris fragments in the atmosphere since 2007, according to NASA... With debris traveling at up to 17,500 miles an hour, the impact of even a marble-size projectile can cause catastrophic damage.
No problem, the Japanese are stepping up now with more capability than NASA is funded to have.
Japan looks to be joining the manned space club that the USA has decided to leave.
And Earth will have its wish come true: our very own debris-destroyer Gundam
WARNING: Smartphones have side effects--most of them undocumented.
Relative to the earth. I imagine that if you're going the opposite direction it could be pretty cosmic. I saw a picture of a space shuttle windshield that had been hit by a paint chip. It didn't quite break through. A frigging paint chip.
Relative to the centre of the Earth, which can be considered stationary for this frame of reference.
A spot at sea level on the equator is moving about 1000 miles an hour in the same frame of reference.
17,500 mph is the same speed as the ISS. At the distance of 22,236 miles, where the telecommunications satellites are, that drops to 6876 mph.
Get a grip and RTFA and links - - - as "the satellite was removed from the rocket" and put into the planned orbit about 15 minutes after the liftoff - Read more at: http://phys.org/news/2016-12-j...
It's NOT attached to the ISS, it's detached and 'doing it's own thing'.
Besides, there is an on-going research project to equip the ISS with proven ion propulsion units to provide 'station keeping' capability with the extremely efficient ion engine technology - - - just a matter of time before the requirement of using the supply launch vehicles' secondary engines to boost the ISS into a clean orbit will be a 'thing of the past'.
Granted, the high-impulse delta-V of the secondary engines will still be needed for 'emergency' maneuvers to avoid the occasional wandering debris near-encounters, but the day-to-day orbital maintenance of the station can be relegated to very low cost ion engine technology.
cheers . . .
redneck geek
The Space Station isn't going to be doing anything to space junk, except trying to avoid it. The supply craft is carrying this tether device to test its performance. After it drops off its payload at the Space Station and detaches, before it is de-orbited, it will unspool this tether and see if the electrodynamic drag produced matches predictions.
Reminds me of Quark from 1978 http://m.imdb.com/title/tt0077...
This actually seems to be an economically feasible solution to de-orbiting space junk - a light-weight 'fishnet' using the earth's geomagnetic field to degrade the velocity of captured debris - no rockets, no fuel, no guidance - simply a light-weight tethering system that 'captures' or ensnares the debris and slows it enough to degrade quickly (relative speaking - days/weeks vs years/decades) and drops the junk into an atmospheric burnup.
GO JAXA - - - wish NASA had the funding and initiative to do the same caliber of work.
Hell, with enough publicity and embarrassment, maybe the US 'secret' programs can be convinced to re-task or multi-task the mini-shuttle being used for surveillance to carry a few dozen of these fishnets as deploy-able capsules to target the biggest pieces of space junk. This tiny mini-shuttle has proven it's ability to stay up for over a year, and with that capability (and presumably the ability to do orbital changes) it could actually do some real good - besides just being an eye-in-the-sky for our security services.
I believe the fishnet deployment capsule could be reduced to a couple of kilograms or less (plastic shell, very thin wires, a firecracker's worth of spin/deployment energy), and using a tiny bit of fuel to launch/deploy (or even a loaded spring), could really be the beginning of the end for orbital space debris.
redneck geek
TFA isn't clear, and mixes terminology. The summary seems to say this will act like a net to remove many little particles, but the technology is a single tether line.
As I recall, years ago there was a tether test that generated so much power (moving through the Earth's magnetic field) that it shorted out part of the test satellite. The goal of that test, if memory serves, was to use the tether as a propulsion/braking system. Run power through to go faster, drain power out for braking. Presumable a resistance coil / heater.
If this is that same technology, it isn't going to do anything for debris that isn't already captured or attached to the tether. Keeping a dead satellite from becoming space junk is good, but this won't help with the countless particles out there already.
Not exactly. I've been trying to dig up information on this, and as far as I can tell, the actual technology itself has nothing to do with space junk. It's just an electrodynamic space tether experiment - aka, using a charged tether to experience lorentz force as it moves through Earth's magnetic field, in order to move up and down. It does nothing to junk as it flies past. The only relation to junk is that they're thinking that they could use tether-boosted spacecraft to dock with pieces of junk, and then change their orbit to make them reenter. You could do that with any thrust mechanism, but this one is nice because it doesn't take fuel. Likewise, you can use this for many applications other than junk. The junk connection appears to be rather tenuous.
Sometimes I doubt your commitment to Sparkle Motion.
How hard can it be>? We'll probably need them for interstellar travel anyways :-P
The connection I see is that you can use it to deorbit satellites at end of life, provided the satellite was was equipped with a deployable tether. Once the tether is deployed, the deorbiting process is completely passive and automatic. This doesn't help at all with the junk that is already present however. Perhaps you could attach tethers to large existing space junk but matching orbits with them to do this would be expensive.
Quattuor res in hoc mundo sanctae sunt: libri, liberi, libertas et liberalitas.
After years of research capturing large objects in the oceans, and despite all the protests by nay-sayers, finally Japan is ready to take their technology into space and in the process help all of humanity...
BRUH -_- did you just mix up ISS with ISIS? Really? If you won't make an effort to read the article at least read the headline carefully. Read it out loud if it helps.
sudo rm -r -f --no-preserve-root /
Use of trawling nets in our oceans has led to the deaths of many marine mammals,most noticeably porpoises/dolphins.
How to they plan to avoid killing all the cute space dolphins?
https://app.box.com/WitthoftResume Code: https://github.com/cellocgw
You need to get this information to NASA IMMEDIATELY!
I suspect they never considered it.
I think people would be more concerned about these space fish nets breaking loose, going adrift and space dolphins becoming entangled in them and drowning.
the preceding comment is my own and in no way reflects the opinion of the Joint Chiefs of Staff