2 United States space satellites will graze.

Two spacecraft in orbit will cross in the night from Wednesday to Thursday.

Two spacecraft in orbit will cross in the night from Wednesday to Thursday.

The risk of collision, although “unlikely”, exists.

IRAS / GGSE 4 satalite event shows potential miss distances of 13-87 meters,

Alles Europa news reports that according to AFP and tweet post by LeoLabs,


The altitude of 900 km is particularly frequented by satellites.

Operators must constantly calculate the risk of collision with the more than 20,000 objects cataloged in Earth orbit, and regularly deviate from their trajectory, which is no longer possible when a satellite is dead.

Adding a few thousand pieces of debris “will create more work for operators and more risk for their vehicles,” says Dan Oltrogge.

“It will also create so-called non-detectable lethal debris, because they are large enough to kill a satellite, but too small to be detected at present,” added the expert.

Alles Europa news reports that in this new light and reports, this Two spacecraft in orbit will cross in the night from Wednesday to Thursday.


The risk of collision, although “unlikely”, exists.

Latest update on the potential collision of IRAS / GGSE 4 tonight, in about 11 hours’ time, suggests a very, very near miss.

The tick marks on this image are 10 seconds apart.

  • Andy Smith (@ g7izu) January 29, 2020.

Alles Europa news reports that this is from a United States space telescope launched in 1983 and an American experimental satellite from 1967, both out of service, will pass within 100 meters of each other over the United States on Wednesday, with a collision probability estimated at 1 out of 100, according to space surveillance companies.

Each satellite flies in opposite orbits and they therefore risk colliding head-on, with a relative speed of almost 15 kilometers per second.


The collision or collision will take place Wednesday at 23:39 GMT, 900 km above the city of Pittsburgh, according to the company LeoLabs.

Our latest data on the IRAS / GGSE 4 event shows potential miss distances of 13-87 meters, with a lowered collision probability currently at 1 in 1000. Time of closest approach remains at 2020-01-29 23: 39: 35.707 UTC

  • LeoLabs, Inc. (@LeoLabs_Space) January 28, 2020.

These types of collisions between satellites that no one controls anymore are rare and dangerous because they create thousands of fragments that risk destroying or damaging active satellites.

Alles Europa news recalled that in 2009, when the Iridium 33 communication satellite (active) and the Russian military satellite out of service Cosmos 2251 met, a thousand fragments of more than 10 cm were propelled, polluting the orbits.

The space telescope, IRAS, was a joint project of NASA, the United Kingdom and the Netherlands and lived 10 months. It weighs a ton, according to a database from the European Space Agency (ESA), and measures two meters by four meters by four mothers.

The American experimental satellite, GGSE-4, was launched by the US Air Force and is light (85 kg), but it has an unusual shape: it is very thin (60 cm) but is 18 meters long, and flies vertically.

The probability of collision calculated by LeoLabs has oscillated in recent days, going from 1 in 1000 to 1 in 100, with a probable distance of 12 meters between the two machines, according to their last calculation on Wednesday.


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The company still considers the shock “unlikely”. This level of risk is considered high by operators.

But significant uncertainties exist on the exact trajectory of the satellites.

If they hit each other, the shock could create a thousand debris larger than 10 cm, told AFP Dan Oltrogge, of Analytical Graphics, and more than 12,000 fragments larger than 1 cm.

When will we know if the shock has occurred? “For the low orbit, the radar coverage is good, and we can observe the fragmentation, we will see objects separate,” says Dan Oltrogge. With the naked eye, however, it is unlikely, he said.

Alles Europa news reports that we will update this reports in the morning for further update.

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