The figure shows a schematic diagram of the anti-satellite test
Recently, the news came, so that domestic and foreign attention to aerospace science and technology fans are shocked out of a cold sweat, the Chinese National Space Administration in its official media reported a "very dangerous rendezvous incident", a piece of space debris from Russia almost hit the Chinese satellite in orbit, the distance between the two rendezvous is only 14.5 meters, how to avoid the recurrence of such risks after that? And how can this be solved? Space junk refers to a variety of man-made objects that orbit the Earth but do not have any use.
The picture shows space junk
According to sources, this piece of space debris numbered 49863 is the disintegration fragment produced by Russia's anti-satellite test, anti-satellite test, is the world's space power for the earth's outer space targeted combat training, that is, commonly known as "hit satellites", these attacks on satellites in orbit, destruction of research tests are very easy to produce a large number of space debris that is difficult to measure in orbit, if it can not be recovered in time, it will become a spacecraft in orbit for various countries. Including the International Space Station and manned spacecraft, there is a huge threat to space junk. Experts in the field of domestic space debris have revealed to the domestic media that when space debris and spacecraft meet, the two sides will guarantee a safe distance of several kilometers or even more than ten kilometers, but this piece of debris from Russia's "Cosmos 1408" is numbered 49863, and the rendezvous distance between it and Tsinghua Science Satellite is much smaller than this standard. The orbital tangents of the two gradually coincide, which also means that they will be closer every time they orbit the Earth.
The picture shows the launch of the Beidou navigation system networking satellite
At present, the world's space powers on the intersection of space objects to predict, inevitably there will be a small amount of error, in order to avoid the risk of these accidental errors, countries will be more than one thousand of the probability of collision of space debris to take emergency orbit change and other evasive actions, for military satellites or important networking satellites, the probability of collision up to one in ten thousand to take evasive action, according to the National Space Administration FragmentAtion Center researchers, The probability of Russia's Space Debris 49863 colliding with Chinese science satellites is 3.71 in 10,000, which has reached the standard of evasion action.
The picture shows the ground measurement and control radar
However, due to the real-time updated data show that the distance between the two gradually began to become farther, the intersection of more than 5 kilometers, so the Chinese satellite did not carry out orbit change operations, the spokesman of the National Space Administration also said at the press conference afterwards, can not rule out the future of the two will be close again, urge Russia for the future of the anti-satellite test to do a good job, the United States also recently published an article that Russia at the end of last year's anti-satellite test produced more than 1600 space debris with a diameter greater than 10 cm. Most of them are distributed at an altitude of 400 to 1100 kilometers in Earth's orbit, and in this interval, China still has hundreds of satellites in working mode. In fact, not only from China's satellites, as long as there are artificial spacecraft in this altitude range, in theory they will be threatened by Russian space debris, Russia's failed anti-satellite test, so that dozens of countries have to worry, day and night to update the orbital data of thousands of pieces of debris to ensure the safety of their own spacecraft in orbit, the lessons of the past should be the lessons of the future, such a dangerous situation will always remind other countries conducting space tests to be cautious and avoid the recurrence of this situation.