Two Dead Satellites May Collide Tonight. That’s Really, Really Bad.

From Popular Mechanics

  • LeoLabs, a company that tracks space junk in Earth’s orbit, announced it was monitoring a potential collision of two objects on October 16.

  • The objects—a defunct Soviet satellite and a discarded Chinese rocket stage—have a combined mass of approximately 6,170 pounds.

  • Experts fear the collision could spur a chain reaction of collisions, kicking the Kessler Syndrome into effect.

On Tuesday, LeoLabs, a company that monitors the paths of space junk in low-Earth orbit, announced on Twitter it was tracking a potential conjunction—that’s space-speak for a mid-orbit crash—tonight between a defunct Soviet satellite and a discarded Chinese rocket stage.

“This is a potentially serious event. It is between 2 large objects and at high altitude, 991km,” former astronaut and LeoLabs co-founder Ed Lu tweeted. “If there is a collision there will be lots of debris which will remain in orbit for a long time.”

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The combined mass of the two objects, which are expected to zip past each other at a whopping relative velocity of about 32,900 miles per hour, is an estimated 6,170 pounds. LeoLabs has since updated its models … and things are looking grim.

According to the company’s latest calculations, the objects are expected to come within 80 feet of each other (±59 feet). The probability of a collision is greater than 10 percent. If the satellites collide, the impact could spread a network of debris throughout low-Earth Orbit.

One of the objects is Parus 64 (Kosmos 2004), a Soviet navigation satellite, which launched on February 22, 1989 and weighs around 1,700 pounds. (It also has a 55-foot-long gravity boom, according to Jonathan McDowell, an astronomer at the Harvard Smithsonian Center for Astrophyics, who tracks space junk.) The other is a Chinese-made CZ-4C rocket stage, which is about 2o feet long and is suspected to have launched in 2004.

LeoLabs noted the CZ-4C rocket stage will pass over one of the company’s New Zealand-based radars shortly after the expected close approach. This should provide enough data to reveal the fate of the two objects and detect any new debris.

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This exact scenario is one that spaceflight experts have been warning about for decades. Earth is shrouded in a web of space junk, with pieces ranging in size from flecks of paint to spent rocket stages. The United States Space Surveillance Network is currently monitoring roughly 200,000 objects between 0.4 and 4 inches, 14,000 objects larger than 4 inches, and thousands of larger objects.

In 1978, NASA scientist Donald Kessler published a landmark paper on

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