Illumin - The Impact of Orbital Debris
There are people with relevant experience, whereas you do not, who made these analyses and found China guilty of needlessly endangering international space efforts, today and future, and that includes China's as well.On January 11, 2007, the People's Republic of China tested an anti-satellite (ASAT) weapon and destroyed its own Fengyun-1C meteorological satellite .
The incident was the largest fragmentation event in the history of manned space operations and the debris from it accounts for more than 25% of all cataloged objects in Low Earth Orbit (LEO) . Large fragmentation events have a significant impact on the total number of orbiting debris and have been on the rise for the last 50 years . The Fengyun-1C fragmentation event created a dramatic increase in total orbital objects during 2007, and as of January 2009, there were 2,378 Fengyun-1C fragments larger than 5 cm being tracked by the U.S. Space Surveillance Network. The total number of fragments larger than 1 cm created by the ASAT test was estimated to be greater than 150,000 .
If there is greater than a 1 in 10,000 chance of collision, the shuttle will maneuver away from the incoming object . Similarly to NASA, mission planners for the International Space Station (ISS) rely heavily on the Space Surveillance Network to continually monitor orbital debris and determine if there is a threat to the human inhabitants on board. Like the Shuttle, the ISS can maneuver away from objects larger than 10 cm. To protect the astronauts from smaller debris, the station is the heaviest shielded vehicle ever launched into orbit and can withstand particle impacts of up to 1 cm in diameter . However, the gap between survivable 1 cm objects and tracked 10 cm objects is of big concern to manned missions. With an average relative velocity of 10 km/s between two objects in LEO, an impact with anything larger than 1 cm would be catastrophic to a manned space mission . With no way to avoid these intermediate-sized objects, an international focus on debris mitigation is vital to keeping space safe for future manned missions.
After a fragmentation event, the debris is cast into orbits with different periods and inclination angles, and each orbit changes orientation at a different rate. Over time the orbits begin to spread out because of the variance in nodal regression rate. In the case of the Fengyun 1-C anti-satellite weapons test, since the debris was distributed across such a wide range of altitudes and orbital periods, the precession rates caused the fragments to envelope the globe and create a shell of orbiting debris in a short period of time, roughly 12 months . Within one year, the orbital debris had almost completely encircled the Earth, clearly indicating the worldwide risk posed by fragmentation events.
Due to the nature of objects in Low Earth Orbit, one country’s orbital pollution contaminates space for the entire international community. Unlike geostationary orbit, where a satellite stays positioned directly above a single point on the Earth’s surface, the shorter periods of satellites in LEO result in them outpacing the Earth’s rotation. With all low orbiting objects encircling the entire globe, there is no way to only clear up the sky above a certain country.
To be blunt about it, your sunken ships analogy is still wrong.
U.S. Plans Test of Anti-Satellite Interceptor Against Failed Intelligence Satellite » FAS Strategic Security Blog
The satellite was successfully placed into a 220 mile high orbit but radio communication with the satellite was soon lost. At 220 miles, the Earth’s atmosphere, while tenuous, still exerts some drag on a satellite the size of a small school bus that is pushing through it at 17,000 miles per hour.
...because the satellite is in such a low orbit, it will lose energy to air resistance and slowly come closer to the Earth.
How did they quantify the "25%" and the "1/10,000" probability?Illumin - The Impact of Orbital Debris
There are people with relevant experience, whereas you do not, who made these analyses and found China guilty of needlessly endangering international space efforts, today and future, and that includes China's as well.
These so called experienced individuals have to give a more detailed account of which shards are the cause of our experiment， which are the cause of the USA impacts or Russia (probably not！ I am lazy to check if they have done anything like that)！Why only the americans are crying the loudest?
blunt! this time your are exceptionally politeTo be blunt about it, your sunken ships analogy is still wrong.
You have alzheimer too. It was alfatzia who made the analogy! And he is not that far off!
the fact is there is no reported collison so far! ever!
dont cry wolves when they are asleepThe issue is not about collisions but about the danger of them
that even makes the accusation sillier! So dont argue with something when you have the answer in favour of your opposition. Get it, old man！and it has been US, not China, who have been monitoring orbital bodies and took measures to avoid collisions. I do not care who brought on that silly sunken ship analogy. The moment you enter the discussion and took defense of it, you own it.
Last edited by shuttler; 01-24-2013 at 10:17 AM.
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